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Preview: Recent Articles in Phys. Rev. ST Accel. Beams

Recent Articles in Phys. Rev. Accel. Beams



Recent articles in Physical Review Accelerators and Beams



Published: 2016-09-30T16:31:35-04:00

 



Efficient computation of coherent synchrotron radiation in a rectangular chamber

2016-09-27T10:00:00-04:00

Author(s): Robert L. Warnock and David A. Bizzozero
We study coherent synchrotron radiation (CSR) in a perfectly conducting vacuum chamber of rectangular cross section, in a formalism allowing an arbitrary sequence of bends and straight sections. We apply the paraxial method in the frequency domain, with a Fourier development in the vertical coordina…
[Phys. Rev. Accel. Beams 19, 090705] Published Tue Sep 27, 2016



Performance analysis of superconducting rf cavities for the CERN rare isotope accelerator

2016-09-23T10:00:00-04:00

Author(s): S. Calatroni, A. Miyazaki, G. Rosaz, A. Sublet, W. Venturini Delsolaro, R. Vaglio, and V. Palmieri
The first cryomodule of the new HIE-ISOLDE rare isotope accelerator has recently been commissioned with beam at CERN, with the second cryomodule ready for installation. Each cryomodule contains five superconducting low-beta quarter wave cavities, produced with the technology of sputtering a thin nio…
[Phys. Rev. Accel. Beams 19, 092002] Published Fri Sep 23, 2016



Multiobjective optimizations of a novel cryocooled dc gun based ultrafast electron diffraction beam line

2016-09-23T10:00:00-04:00

Author(s): Colwyn Gulliford, Adam Bartnik, and Ivan Bazarov
We present the results of multiobjective genetic algorithm optimizations of a single-shot ultrafast electron diffraction beam line utilizing a 225 kV dc gun with a novel cryocooled photocathode system and buncher cavity. Optimizations of the transverse projected emittance as a function of bunch char…
[Phys. Rev. Accel. Beams 19, 093402] Published Fri Sep 23, 2016



Electron bunch structure in energy recovery linac with high-voltage dc photoelectron gun

2016-09-23T10:00:00-04:00

Author(s): Y. M. Saveliev, F. Jackson, J. K. Jones, and J. W. McKenzie
The internal structure of electron bunches generated in an injector line with a dc photoelectron gun is investigated. Experiments were conducted on the ALICE (accelerators and lasers in combined experiments) energy recovery linac at Daresbury Laboratory. At a relatively low dc gun voltage of 230 kV,…
[Phys. Rev. Accel. Beams 19, 094002] Published Fri Sep 23, 2016



Longitudinal stability in multiharmonic standing wave linacs

2016-09-22T10:00:00-04:00

Author(s): L. R. Carver, R. M. Jones, Y. Jiang, and J. L. Hirshfield
Accelerating cavities that excite multiple modes at integer harmonics of the fundamental frequency have the potential to be used to suppress the onset of rf breakdown and reduce the pulsed surface heating at high accelerating gradients. Understanding the effect of an additional harmonic cavity mode …
[Phys. Rev. Accel. Beams 19, 094001] Published Thu Sep 22, 2016



Utilizing the N beam position monitor method for turn-by-turn optics measurements

2016-09-21T10:00:00-04:00

Author(s): A. Langner, G. Benedetti, M. Carlà, U. Iriso, Z. Martí, J. Coello de Portugal, and R. Tomás
The N beam position monitor method (N-BPM) which was recently developed for the LHC has significantly improved the precision of optics measurements that are based on BPM turn-by-turn data. The main improvement is due to the consideration of correlations for statistical and systematic error sources, …
[Phys. Rev. Accel. Beams 19, 092803] Published Wed Sep 21, 2016



Radiation emitted by transverse-gradient undulators

2016-09-20T10:00:00-04:00

Author(s): Axel Bernhard, Nils Braun, Verónica Afonso Rodríguez, Peter Peiffer, Robert Rossmanith, Christina Widmann, and Michael Scheer
Conventional undulators are used in synchrotron light sources to produce radiation with a narrow relative spectral width as compared to bending magnets or wigglers. The spectral width of the radiation produced by conventional undulators is determined by the number of undulator periods and by the ene…
[Phys. Rev. Accel. Beams 19, 090704] Published Tue Sep 20, 2016



Factors affecting the output pulse flatness of the linear transformer driver cavity systems with 5th harmonics

2016-09-19T10:00:00-04:00

Author(s): V. M. Alexeenko, M. G. Mazarakis, A. A. Kim, S. S. Kondratiev, V. A. Sinebryukhov, S. N. Volkov, M. E. Cuneo, M. L. Kiefer, J. J. Leckby, B. V. Oliver, and P. D. Maloney
We describe the study we have undertaken to evaluate the effect of component tolerances in obtaining a voltage output flat top for a linear transformer driver (LTD) cavity containing 3rd and 5th harmonic bricks [A. A. Kim et al., in Proc. IEEE Pulsed Power and Plasma Science PPPS2013 (San Francisco…
[Phys. Rev. Accel. Beams 19, 090401] Published Mon Sep 19, 2016



Design and experimental tests of free electron laser wire scanners

2016-09-16T10:00:00-04:00

Author(s): G. L. Orlandi, P. Heimgartner, R. Ischebeck, C. Ozkan Loch, S. Trovati, P. Valitutti, V. Schlott, M. Ferianis, and G. Penco
SwissFEL is a x-rays free electron laser (FEL) driven by a 5.8 GeV linac under construction at Paul Scherrer Institut. In SwissFEL, wire scanners (WSCs) will be complementary to view-screens for emittance measurements and routinely used to monitor the transverse profile of the electron beam during F…
[Phys. Rev. Accel. Beams 19, 092802] Published Fri Sep 16, 2016



Measurements and simulations of wakefields at the Accelerator Test Facility 2

2016-09-15T10:00:00-04:00

Author(s): J. Snuverink, R. Ainsworth, S. T. Boogert, F. J. Cullinan, A. Lyapin, Y. I. Kim, K. Kubo, S. Kuroda, T. Okugi, T. Tauchi, N. Terunuma, J. Urakawa, and G. R. White
Wakefields are an important factor in accelerator design, and are a real concern when preserving the low beam emittance in modern machines. Charge dependent beam size growth has been observed at the Accelerator Test Facility (ATF2), a test accelerator for future linear collider beam delivery systems…
[Phys. Rev. Accel. Beams 19, 091002] Published Thu Sep 15, 2016



Theoretical study of a waveguide THz free electron laser and comparisons with simulations

2016-09-14T10:00:00-04:00

Author(s): Yoshihiro Shobuda and Yong Ho Chin

This paper fills a gap in the waveguide free electron laser theory by considering transverse distribution and energy spread of the electron beam.

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[Phys. Rev. Accel. Beams 19, 094201] Published Wed Sep 14, 2016



Mid-infrared lasers for energy frontier plasma accelerators

2016-09-12T10:00:00-04:00

Author(s): I. V. Pogorelsky, M. N. Polyanskiy, and W. D. Kimura

Mid-infrared lasers offer an alternative path for plasma acceleration; proposed applications include lepton colliders, gamma colliders, and positron sources.

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[Phys. Rev. Accel. Beams 19, 091001] Published Mon Sep 12, 2016



Extremum seeking x-ray position feedback using power line harmonic leakage as the perturbation

2016-09-12T10:00:00-04:00

Author(s): S. Zohar, D. J. Kissick, N. Venugopalan, C. M. Ogata, O. Makarov, S. Stepanov, and R. F. Fischetti
Small x-ray beam sizes necessary for probing nanoscale phenomena require exquisite stability to prevent data corruption by noise. One source of instability at synchrotron radiation x-ray beamlines is the slow detuning of x-ray optics to marginal alignment where the onset of clipping increases the be…
[Phys. Rev. Accel. Beams 19, 092801] Published Mon Sep 12, 2016



Propagation of elastic pressure waves in a beam window

2016-09-12T10:00:00-04:00

Author(s): T. R. Davenne and P. Loveridge
As particle accelerator beam power increases, stress on beam windows and targets increases. Many simulations are carried out to model the dynamic stresses that are induced in these critical components by near instantaneous beam heating. However while it is often easy to obtain simulation results the…
[Phys. Rev. Accel. Beams 19, 093501] Published Mon Sep 12, 2016



Tunable polarization plasma channel undulator for narrow bandwidth photon emission

2016-09-09T10:00:00-04:00

Author(s): S. G. Rykovanov, J. W. Wang, V. Yu. Kharin, B. Lei, C. B. Schroeder, C. G. R. Geddes, E. Esarey, and W. P. Leemans

Undulator field generated by off-axis or crossing injection of laser beam into plasma channel is discussed with appealing properties for practical applications.

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[Phys. Rev. Accel. Beams 19, 090703] Published Fri Sep 09, 2016



Production of superconducting 1.3-GHz cavities for the European X-ray Free Electron Laser

2016-09-09T10:00:00-04:00

Author(s): W. Singer, A. Brinkmann, R. Brinkmann, J. Iversen, A. Matheisen, W.-D. Moeller, A. Navitski, D. Reschke, J. Schaffran, A. Sulimov, N. Walker, H. Weise, P. Michelato, L. Monaco, C. Pagani, and M. Wiencek

Analysis and review of the largest production to date of superconducting cavities.

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[Phys. Rev. Accel. Beams 19, 092001] Published Fri Sep 09, 2016



Tracing dynamics of laser-induced fields on ultrathin foils using complementary imaging with streak deflectometry

2016-09-08T10:00:00-04:00

Author(s): F. Abicht, J. Braenzel, G. Priebe, Ch. Koschitzki, A. A. Andreev, P. V. Nickles, W. Sander, and M. Schnürer
We present a detailed study of the electric and magnetic fields, which are created on plasma vacuum interfaces as a result of highly intense laser-matter interactions. For the field generation ultrathin polymer foils (30–50 nm) were irradiated with high intensity femtosecond (10^{19}–10^{20}  W/cm^{…
[Phys. Rev. Accel. Beams 19, 091302] Published Thu Sep 08, 2016



Comment on “Controlling the spectral shape of nonlinear Thomson scattering with proper laser chirping”

2016-09-08T10:00:00-04:00

Author(s): Balša Terzić and Geoffrey A. Krafft
Rykovanov, Geddes, Schroeder, Esarey and Leemans [Phys. Rev. Accel. Beams 19, 030701 (2016); hereafter RGSEL] have recently reported on the analytic derivation for the laser pulse frequency modulation (chirping) which controls spectrum broadening for high laser pulse intensities. We demonstrate here…
[Phys. Rev. Accel. Beams 19, 098001] Published Thu Sep 08, 2016



Reply to “Comment on ‘Controlling the spectral shape of nonlinear Thomson scattering with proper laser chirping’”

2016-09-08T10:00:00-04:00

Author(s): S. G. Rykovanov, C. G. R. Geddes, C. B. Schroeder, E. Esarey, and W. P. Leemans
We reply to Terzic and Krafft’s forgoing Comment [Phys. Rev. Accel. Beams, Comment on “Controlling the spectral shape of nonlinear Thomson scattering with proper laser chirping” 19 (2016)]. We disagree with the conclusion of the Comment regarding the novelty of solutions and the citations presented …
[Phys. Rev. Accel. Beams 19, 098002] Published Thu Sep 08, 2016



Generation of large-bandwidth x-ray free-electron-laser pulses

2016-09-07T10:00:00-04:00

Author(s): Angela Saa Hernandez, Eduard Prat, Simona Bettoni, Bolko Beutner, and Sven Reiche
X-ray free-electron lasers (XFELs) are modern research tools in disciplines such as biology, material science, chemistry, and physics. Besides the standard operation that aims at minimizing the bandwidth of the produced XFEL radiation, there is a strong scientific demand to produce large-bandwidth X…
[Phys. Rev. Accel. Beams 19, 090702] Published Wed Sep 07, 2016



Method to generate a pulse train of few-cycle coherent radiation

2016-09-06T10:00:00-04:00

Author(s): Bryant Garcia, Erik Hemsing, Tor Raubenheimer, Lawrence T. Campbell, and Brian W. J. McNeil
We develop a method to generate a long pulse train of few-cycle coherent radiation by modulating an electron beam with a high power laser. The large energy modulation disperses the beam in a radiating undulator and leads to the production of phase-locked few-cycle coherent radiation pulses. These pu…
[Phys. Rev. Accel. Beams 19, 090701] Published Tue Sep 06, 2016



Brilliant GeV electron beam with narrow energy spread generated by a laser plasma accelerator

2016-09-06T10:00:00-04:00

Author(s): Ronghao Hu, Haiyang Lu, Yinren Shou, Chen Lin, Hongbin Zhuo, Chia-erh Chen, and Xueqing Yan
The production of GeV electron beam with narrow energy spread and high brightness is investigated using particle-in-cell simulations. A controlled electron injection scheme and a method for phase-space manipulation in a laser plasma accelerator are found to be essential. The injection is triggered b…
[Phys. Rev. Accel. Beams 19, 091301] Published Tue Sep 06, 2016



Polarized ^{3} He^{+2} ions in the Alternate Gradient Synchrotron to RHIC transfer line

2016-09-06T10:00:00-04:00

Author(s): N. Tsoupas, H. Huang, F. Méot, V. Ptitsyn, T. Roser, and D. Trbojevic
The proposed electron-hadron collider (eRHIC) to be built at Brookhaven National Laboratory (BNL) will allow the collisions of 20 GeV polarized electrons with 250 GeV polarized protons, or 100  GeV/n polarized ^{3}He^{+2} ions, or other unpolarized ion species. The large value of the anomalous magne…
[Phys. Rev. Accel. Beams 19, 094702] Published Tue Sep 06, 2016



Compton sources for the observation of elastic photon-photon scattering events

2016-09-01T10:00:00-04:00

Author(s): D. Micieli, I. Drebot, A. Bacci, E. Milotti, V. Petrillo, M. Rossetti Conti, A. R. Rossi, E. Tassi, and L. Serafini
We present the design of a photon-photon collider based on conventional Compton gamma sources for the observation of elastic γγ scattering. Two symmetric electron beams, generated by photocathodes and accelerated in linacs, produce two primary gamma rays through Compton backscattering with two high …
[Phys. Rev. Accel. Beams 19, 093401] Published Thu Sep 01, 2016



Focusing effects in laser-electron Thomson scattering

2016-09-01T10:00:00-04:00

Author(s): Chris Harvey, Mattias Marklund, and Amol R. Holkundkar

More realistic laser beams affect spectral properties of Thomson scattering.

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[Phys. Rev. Accel. Beams 19, 094701] Published Thu Sep 01, 2016



High power experimental studies of hybrid photonic band gap accelerator structures

2016-08-31T10:00:00-04:00

Author(s): JieXi Zhang, Brian J. Munroe, Haoran Xu, Michael A. Shapiro, and Richard J. Temkin
This paper reports the first high power tests of hybrid photonic band gap (PBG) accelerator structures. Three hybrid PBG (HPBG) structures were designed, built and tested at 17.14 GHz. Each structure had a triangular lattice array with 60 inner sapphire rods and 24 outer copper rods sandwiched betwe…
[Phys. Rev. Accel. Beams 19, 081304] Published Wed Aug 31, 2016



Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through T_{c}

2016-08-26T10:00:00-04:00

Author(s): Shichun Huang, Takayuki Kubo, and R. L. Geng
Recent studies by Romanenko et al. revealed that cooling down a superconducting cavity under a large spatial temperature gradient decreases the amount of trapped flux and leads to reduction of the residual surface resistance. In the present paper, the flux expulsion ratio and the trapped-flux-induce…
[Phys. Rev. Accel. Beams 19, 082001] Published Fri Aug 26, 2016



Optimization of positrons generation based on laser wakefield electron acceleration

2016-08-23T10:00:00-04:00

Author(s): Yuchi Wu, Dan Han, Tiankui Zhang, Kegong Dong, Bin Zhu, Yonghong Yan, and Yuqiu Gu
Laser based positron represents a new particle source with short pulse duration and high charge density. Positron production based on laser wakefield electron acceleration (LWFA) has been investigated theoretically in this paper. Analytical expressions for positron spectra and yield have been obtain…
[Phys. Rev. Accel. Beams 19, 081303] Published Tue Aug 23, 2016



Ultrafast harmonic rf kicker design and beam dynamics analysis for an energy recovery linac based electron circulator cooler ring

2016-08-22T10:00:00-04:00

Author(s): Yulu Huang, Haipeng Wang, Robert A. Rimmer, Shaoheng Wang, and Jiquan Guo
An ultrafast kicker system is being developed for the energy recovery linac (ERL) based electron circulator cooler ring (CCR) in the proposed Jefferson Lab Electron Ion Collider (JLEIC, previously named MEIC). In the CCR, the injected electron bunches can be recirculated while performing ion cooling…
[Phys. Rev. Accel. Beams 19, 084201] Published Mon Aug 22, 2016



Asymmetric dual axis energy recovery linac for ultrahigh flux sources of coherent x-ray and THz radiation: Investigations towards its ultimate performance

2016-08-19T10:00:00-04:00

Author(s): R. Ainsworth, G. Burt, I. V. Konoplev, and A. Seryi
In order for sources of coherent high brightness and intensity THz and x-ray radiation to be accepted by university or industrial R laboratories, truly compact, high current and efficient particle accelerators are required. The demand for compactness and efficiency can be satisfied by superconductin…
[Phys. Rev. Accel. Beams 19, 083502] Published Fri Aug 19, 2016



Explicit symplectic orbit and spin tracking method for electric storage ring

2016-08-18T10:00:00-04:00

Author(s): Kilean Hwang and S. Y. Lee
We develop a symplectic charged particle tracking method for phase space coordinates and polarization in all electric storage rings. Near the magic energy, the spin precession tune is proportional to the fractional momentum deviation δ_{m} from the magic energy, and the amplitude of the radial and l…
[Phys. Rev. Accel. Beams 19, 084001] Published Thu Aug 18, 2016



Generation of subterawatt-attosecond pulses in a soft x-ray free-electron laser

2016-08-15T10:00:00-04:00

Author(s): Senlin Huang, Yuantao Ding, Zhirong Huang, and Gabriel Marcus
We propose a novel scheme to generate attosecond soft x rays in a self-seeded free-electron laser (FEL) suitable for enabling attosecond spectroscopic investigations. A time-energy chirped electron bunch with additional sinusoidal energy modulation is adopted to produce a short seed pulse through a …
[Phys. Rev. Accel. Beams 19, 080702] Published Mon Aug 15, 2016



Case study of a magnetic system for low-energy machines

2016-08-10T10:00:00-04:00

Author(s): Daniel Schoerling
The extra low-energy antiproton ring (ELENA) is a CERN particle decelerator with the purpose to deliver antiprotons at lowest energies aiming to enhance the study of antimatter. The hexagonal shaped ring with a circumference of about 30 m will decelerate antiprotons from momenta of 100 to 13.7  MeV/…
[Phys. Rev. Accel. Beams 19, 082401] Published Wed Aug 10, 2016



Short electron bunch generation using single-cycle ultrafast electron guns

2016-08-09T10:00:00-04:00

Author(s): Arya Fallahi, Moein Fakhari, Alireza Yahaghi, Miguel Arrieta, and Franz X. Kärtner
We introduce a solution for producing ultrashort (∼fs) high charge (∼pC) from ultracompact guns utilizing single-cycle THz pulses. We show that the readily available THz pulses with energies as low as 20  μJ are sufficient to generate multi-10 keV electron bunches. Moreover, it is demonstrated that …
[Phys. Rev. Accel. Beams 19, 081302] Published Tue Aug 09, 2016



Efficiency of feedbacks for suppression of transverse instabilities of bunched beams

2016-08-05T10:00:00-04:00

Author(s): Alexey Burov
Which gain and phase have to be set for a bunch-by-bunch transverse damper, and at which chromaticity is it better to stay? These questions are considered for three models: the two-particle model with possible quadrupole wake, the author’s nested head-tail (NHT) model with the broadband impedance, a…
[Phys. Rev. Accel. Beams 19, 084402] Published Fri Aug 05, 2016



X-ray characterization by energy-resolved powder diffraction

2016-08-04T10:00:00-04:00

Author(s): G. Cheung and S. M. Hooker

Single-shot, nondestructive measurements can characterize x-ray beams arising from betatron oscillations in a plasma accelerator.

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[Phys. Rev. Accel. Beams 19, 082801] Published Thu Aug 04, 2016



Common operation metrics for storage ring light sources

2016-08-04T10:00:00-04:00

Author(s): A. Lüdeke, M. Bieler, R. H. A. Farias, S. Krecic, R. Müller, M. Pont, and M. Takao
Storage ring light sources aim for high operational reliability. Very often beam availability is used as an operation metric to measure the reliability. A survey of several light sources reveals that the calculation of availability varies significantly between facilities. This complicates useful com…
[Phys. Rev. Accel. Beams 19, 082802] Published Thu Aug 04, 2016



Systematic neutron guide misalignment for an accelerator-driven spallation neutron source

2016-08-04T10:00:00-04:00

Author(s): C. Zendler and P. M. Bentley
The European Spallation Source (ESS) is a long pulse spallation neutron source that is currently under construction in Lund, Sweden. A considerable fraction of the 22 planned instruments extend as far as 75–150 m from the source. In such long beam lines, misalignment between neutron guide segments c…
[Phys. Rev. Accel. Beams 19, 083501] Published Thu Aug 04, 2016



Analytical formulas for short bunch wakes in a flat dechirper

2016-08-04T10:00:00-04:00

Author(s): Karl Bane, Gennady Stupakov, and Igor Zagorodnov
We develop analytical models of the longitudinal and transverse wakes, on and off axis for a flat, corrugated beam pipe with realistic parameters, and then compare them with numerical calculations, and generally find good agreement. These analytical “first order” formulas approximate the droop at th…
[Phys. Rev. Accel. Beams 19, 084401] Published Thu Aug 04, 2016



Beam induced hydrodynamic tunneling in the future circular collider components

2016-08-03T10:00:00-04:00

Author(s): N. A. Tahir, F. Burkart, R. Schmidt, A. Shutov, D. Wollmann, and A. R. Piriz
A future circular collider (FCC) has been proposed as a post-Large Hadron Collider accelerator, to explore particle physics in unprecedented energy ranges. The FCC is a circular collider in a tunnel with a circumference of 80–100 km. The FCC study puts an emphasis on proton-proton high-energy and el…
[Phys. Rev. Accel. Beams 19, 081002] Published Wed Aug 03, 2016



Quasilinear theory of terahertz free-electron lasers based on Compton scattering of incoherent pump wave by intense relativistic electron beam

2016-08-02T10:00:00-04:00

Author(s): N. S. Ginzburg and E. R. Kocharovskaya
The use of incoherent broadband pump radiation for improving the electron efficiency in the free-electron lasers (FEL) based on stimulated backscattering is considered. On the basis of a quasilinear approach, it is shown that the efficiency increases in proportion to the width of the pump spectrum. …
[Phys. Rev. Accel. Beams 19, 080701] Published Tue Aug 02, 2016



Beam-induced wakefield observation in X-band choke-mode cavities

2016-08-01T10:00:00-04:00

Author(s): Hao Zha, Chunguang Jing, Jiaqi Qiu, Eric E. Wisniewski, Manoel Conde, John G. Power, Darrell S. Doran, Wanming Liu, Jiaru Shi, Chen Li, Wei Gai, and Huaibi Chen
The X-band choke-mode structure is currently being studied as an alternative design for the accelerating structure of the compact linear collider (CLIC) main linac. The geometry of the choke-mode structure is designed to ensure the strong suppression of the beam-induced long-range transverse wakefie…
[Phys. Rev. Accel. Beams 19, 081001] Published Mon Aug 01, 2016



Higher order mode damping in a five-cell superconducting rf cavity with a photonic band gap coupler cell

2016-08-01T10:00:00-04:00

Author(s): Sergey A. Arsenyev, Richard J. Temkin, Dmitry Yu. Shchegolkov, Evgenya I. Simakov, Chase H. Boulware, Terry L. Grimm, and Adam R. Rogacki
We present a study of higher order mode (HOM) damping in the first multicell superconducting radio-frequency (SRF) cavity with a photonic band gap (PBG) coupler cell. Achieving higher average beam currents is particularly desirable for future light sources and particle colliders based on SRF energy-…
[Phys. Rev. Accel. Beams 19, 081301] Published Mon Aug 01, 2016



Amplitude dependent closest tune approach

2016-07-28T10:00:00-04:00

Author(s): R. Tomás, T. H. B. Persson, and E. H. Maclean
Recent observations in the LHC point to the existence of an amplitude dependent closest tune approach. However this dynamical behavior and its underlying mechanism remain unknown. This effect is highly relevant for the LHC as an unexpected closest tune approach varying with amplitude modifies the fr…
[Phys. Rev. Accel. Beams 19, 071003] Published Thu Jul 28, 2016



Theory of electromagnetic insertion devices and the corresponding synchrotron radiation

2016-07-27T10:00:00-04:00

Author(s): Muhammad Shumail and Sami G. Tantawi
Permanent magnet insertion devices (IDs), which are the main radiation generating devices in synchrotron light sources and free-electron lasers, use a time-invariant but space-periodic magnetic field to wiggle relativistic electrons for short-wavelength radiation generation. Recently, a high power m…
[Phys. Rev. Accel. Beams 19, 074001] Published Wed Jul 27, 2016



Simple model of the slingshot effect

2016-07-21T10:00:00-04:00

Author(s): Gaetano Fiore and Sergio De Nicola
We present a detailed quantitative description of the recently proposed “slingshot effect.” Namely, we determine a broad range of conditions under which the impact of a very short and intense laser pulse normally onto a low-density plasma (or matter locally completely ionized into a plasma by the pu…
[Phys. Rev. Accel. Beams 19, 071302] Published Thu Jul 21, 2016



Demonstration of passive plasma lensing of a laser wakefield accelerated electron bunch

2016-07-20T10:00:00-04:00

Author(s): S. Kuschel, D. Hollatz, T. Heinemann, O. Karger, M. B. Schwab, D. Ullmann, A. Knetsch, A. Seidel, C. Rödel, M. Yeung, M. Leier, A. Blinne, H. Ding, T. Kurz, D. J. Corvan, A. Sävert, S. Karsch, M. C. Kaluza, B. Hidding, and M. Zepf
We report on the first demonstration of passive all-optical plasma lensing using a two-stage setup. An intense femtosecond laser accelerates electrons in a laser wakefield accelerator (LWFA) to 100 MeV over millimeter length scales. By adding a second gas target behind the initial LWFA stage we intr…
[Phys. Rev. Accel. Beams 19, 071301] Published Wed Jul 20, 2016



Superconducting resonator used as a phase and energy detector for linac setup

2016-07-19T10:00:00-04:00

Author(s): Nikolai R. Lobanov
Booster linacs for tandem accelerators and positive ion superconducting injectors have matured into standard features of many accelerator laboratories. Both types of linac are formed as an array of independently-phased resonators operating at room temperature or in a superconducting state. Each acce…
[Phys. Rev. Accel. Beams 19, 072801] Published Tue Jul 19, 2016



Rotating system for four-dimensional transverse rms-emittance measurements

2016-07-19T10:00:00-04:00

Author(s): C. Xiao, M. Maier, X. N. Du, P. Gerhard, L. Groening, S. Mickat, and H. Vormann
Knowledge of the transverse four-dimensional beam rms parameters is essential for applications that involve lattice elements that couple the two transverse degrees of freedom (planes). Of special interest is the elimination of interplane correlations to reduce the projected emittances. A dedicated r…
[Phys. Rev. Accel. Beams 19, 072802] Published Tue Jul 19, 2016



Design of general apochromatic drift-quadrupole beam lines

2016-07-15T10:00:00-04:00

Author(s): C. A. Lindstrøm and E. Adli

Correcting chromatic errors without sextupoles may have important practical applications in future accelerators.

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[Phys. Rev. Accel. Beams 19, 071002] Published Fri Jul 15, 2016



CERN antiproton target: Hydrocode analysis of its core material dynamic response under proton beam impact

2016-07-15T10:00:00-04:00

Author(s): Claudio Torregrosa Martin, Antonio Perillo-Marcone, Marco Calviani, and José-Luis Muñoz-Cobo
Antiprotons are produced at CERN by colliding a 26  GeV/c proton beam with a fixed target made of a 3 mm diameter, 55 mm length iridium core. The inherent characteristics of antiproton production involve extremely high energy depositions inside the target when impacted by each primary proton beam, m…
[Phys. Rev. Accel. Beams 19, 073402] Published Fri Jul 15, 2016



rf traveling-wave electron gun for photoinjectors

2016-07-12T10:00:00-04:00

Author(s): Mattia Schaer, Alessandro Citterio, Paolo Craievich, Sven Reiche, Lukas Stingelin, and Riccardo Zennaro

Novel traveling-wave rf gun for compact high-brightness photoinjectors is designed by joint optimization of beam dynamics and 3D rf calculations.

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[Phys. Rev. Accel. Beams 19, 072001] Published Tue Jul 12, 2016



Beam induced electron cloud resonances in dipole magnetic fields

2016-07-12T10:00:00-04:00

Author(s): J. R. Calvey, W. Hartung, J. Makita, and M. Venturini
The buildup of low energy electrons in an accelerator, known as electron cloud, can be severely detrimental to machine performance. Under certain beam conditions, the beam can become resonant with the cloud dynamics, accelerating the buildup of electrons. This paper will examine two such effects: mu…
[Phys. Rev. Accel. Beams 19, 074401] Published Tue Jul 12, 2016



Publisher’s Note: High intensity neutrino oscillation facilities in Europe [Phys. Rev. Accel. Beams 16, 021002 (2013)]

2016-07-08T10:00:00-04:00

Author(s): T. R. Edgecock et al.
[Phys. Rev. Accel. Beams 19, 079901] Published Fri Jul 08, 2016



Conceptual design of a 10^{13} -W pulsed-power accelerator for megajoule-class dynamic-material-physics experiments

2016-07-07T10:00:00-04:00

Author(s): W. A. Stygar et al.
We have developed a conceptual design of a next-generation pulsed-power accelerator that is optimized for megajoule-class dynamic-material-physics experiments. Sufficient electrical energy is delivered by the accelerator to a physics load to achieve—within centimeter-scale samples—material pressures…
[Phys. Rev. Accel. Beams 19, 070401] Published Thu Jul 07, 2016



Storage ring two-color free-electron laser

2016-07-05T10:00:00-04:00

Author(s): J. Yan, H. Hao, J. Y. Li, S. F. Mikhailov, V. G. Popov, N. A. Vinokurov, S. Huang, J. Wu, S. Günster, and Y. K. Wu
We report a systematic experimental study of a storage ring two-color free-electron laser (FEL) operating simultaneously in the infrared (IR) and ultraviolet (UV) wavelength regions. The two-color FEL lasing has been realized using a pair of dual-band high-reflectivity FEL mirrors with two different…
[Phys. Rev. Accel. Beams 19, 070701] Published Tue Jul 05, 2016



Channeling, volume reflection, and volume capture study of electrons in a bent silicon crystal

2016-07-05T10:00:00-04:00

Author(s): T. N. Wistisen, U. I. Uggerhøj, U. Wienands, T. W. Markiewicz, R. J. Noble, B. C. Benson, T. Smith, E. Bagli, L. Bandiera, G. Germogli, V. Guidi, A. Mazzolari, R. Holtzapple, and S. Tucker
We present the experimental data and analysis of experiments conducted at SLAC National Accelerator Laboratory investigating the processes of channeling, volume-reflection and volume-capture along the (111) plane in a strongly bent quasimosaic silicon crystal. These phenomena were investigated at 5 …
[Phys. Rev. Accel. Beams 19, 071001] Published Tue Jul 05, 2016



Ion wave breaking acceleration

2016-07-05T10:00:00-04:00

Author(s): B. Liu, J. Meyer-ter-Vehn, K-U. Bamberg, W. J. Ma, J. Liu, X. T. He, X. Q. Yan, and H. Ruhl
Laser driven ion wave breaking acceleration (IWBA) in plasma wakefields is investigated by means of a one-dimensional (1D) model and 1D/3D particle-in-cell (PIC) simulations. IWBA operates in relativistic transparent plasma for laser intensities in the range of 10^{20}–10^{23}  W/cm^{2}. The thresho…
[Phys. Rev. Accel. Beams 19, 073401] Published Tue Jul 05, 2016



High-power free-electron maser operated in a two-mode frequency-multiplying regime

2016-06-29T10:00:00-04:00

Author(s): N. Yu. Peskov, I. V. Bandurkin, A. K. Kaminsky, S. V. Kuzikov, E. A. Perelstein, A. V. Savilov, S. N. Sedykh, and A. A. Vikharev
The frequency multiplication effects in high-power free-electron masers (FEM) with Bragg cavities were studied to provide the advance of the oscillators into short-wavelength bands. Theoretical analysis of frequency-multiplying FEMs was carried out within the framework of the averaged coupled-wave a…
[Phys. Rev. Accel. Beams 19, 060704] Published Wed Jun 29, 2016



Dosimetric response of radiochromic films to protons of low energies in the Bragg peak region

2016-06-21T10:00:00-04:00

Author(s): M. C. Battaglia, D. Schardt, J. M. Espino, M. I. Gallardo, M. A. Cortés-Giraldo, J. M. Quesada, A. M. Lallena, H. Miras, and D. Guirado
One of the major advantages of proton or ion beams, applied in cancer treatment, is their excellent depth-dose profile exhibiting a low dose in the entrance channel and a distinct dose maximum (Bragg peak) near the end of range in tissue. In the region of the Bragg peak, where the protons or ions ar…
[Phys. Rev. Accel. Beams 19, 064701] Published Tue Jun 21, 2016



Laser mode complexity analysis in infrared waveguide free-electron lasers

2016-06-20T10:00:00-04:00

Author(s): Rui Prazeres
We analyze an optical phenomenon taking place in waveguide free-electron lasers, which disturbs, or forbids, operation in far infrared range. Waveguides in the optical cavity are used in far-infrared and THz ranges in order to avoid diffraction optical losses, and a hole coupling on output mirror is…
[Phys. Rev. Accel. Beams 19, 060703] Published Mon Jun 20, 2016



Toward high-energy laser-driven ion beams: Nanostructured double-layer targets

2016-06-20T10:00:00-04:00

Author(s): M. Passoni, A. Sgattoni, I. Prencipe, L. Fedeli, D. Dellasega, L. Cialfi, Il Woo Choi, I Jong Kim, K. A. Janulewicz, Hwang Woon Lee, Jae Hee Sung, Seong Ku Lee, and Chang Hee Nam
The development of novel target concepts is crucial to make laser-driven acceleration of ion beams suitable for applications. We tested double-layer targets formed of an ultralow density nanostructured carbon layer (∼7  mg/cm^{3}, 8–12  μm–thick) deposited on a μm–thick solid Al foil. A systematic i…
[Phys. Rev. Accel. Beams 19, 061301] Published Mon Jun 20, 2016



Pressurized rf cavities in ionizing beams

2016-06-20T10:00:00-04:00

Author(s): B. Freemire, A. V. Tollestrup, K. Yonehara, M. Chung, Y. Torun, R. P. Johnson, G. Flanagan, P. M. Hanlet, M. G. Collura, M. R. Jana, M. Leonova, A. Moretti, and T. Schwarz
A muon collider or Higgs factory requires significant reduction of the six dimensional emittance of the beam prior to acceleration. One method to accomplish this involves building a cooling channel using high pressure gas filled radio frequency cavities. The performance of such a cavity when subject…
[Phys. Rev. Accel. Beams 19, 062004] Published Mon Jun 20, 2016



Compact rf polarizer and its application to pulse compression systems

2016-06-17T10:00:00-04:00

Author(s): Matthew Franzi, Juwen Wang, Valery Dolgashev, and Sami Tantawi
We present a novel method of reducing the footprint and increasing the efficiency of the modern multi-MW rf pulse compressor. This system utilizes a high power rf polarizer to couple two circular waveguide modes in quadrature to a single resonant cavity in order to replicate the response of a tradit…
[Phys. Rev. Accel. Beams 19, 062002] Published Fri Jun 17, 2016



Conceptual design of X band waveguide dual circular polarizer

2016-06-17T10:00:00-04:00

Author(s): Chen Xu, Sami Tantawi, and Juwen Wang
A new design of dual circular polarizer is presented in this paper. This innovative design converts radiofrequency (rf) energy from TE10 mode in a rectangular waveguide to two polarized TE11 modes in a circular waveguide. A reflection less than −20  db is achieved and breakdown field is less than 42…
[Phys. Rev. Accel. Beams 19, 062003] Published Fri Jun 17, 2016



Temporal characterization of ultrashort linearly chirped electron bunches generated from a laser wakefield accelerator

2016-06-17T10:00:00-04:00

Author(s): C. J. Zhang, J. F. Hua, Y. Wan, B. Guo, C.-H. Pai, Y. P. Wu, F. Li, H.-H. Chu, Y. Q. Gu, W. B. Mori, C. Joshi, J. Wang, and W. Lu
A new method for diagnosing the temporal characteristics of ultrashort electron bunches with linear energy chirp generated from a laser wakefield accelerator is described. When the ionization-injected bunch interacts with the back of the drive laser, it is deflected and stretched along the direction…
[Phys. Rev. Accel. Beams 19, 062802] Published Fri Jun 17, 2016



Possible emittance growth induced by nonlinear space charge fields for arbitrary particle distributions

2016-06-16T10:00:00-04:00

Author(s): Takashi Kikuchi (菊池 崇志) and Kazuhiko Horioka (堀岡 一彦)
A procedure to obtain a ratio of beam radii at final and initial states in arbitrary particle distributions is proposed, and is applied to the estimation of possible emittance growth for Gaussian and thermal equilibrium distributions. The ratios are estimated for Gaussian and thermal equilibrium dis…
[Phys. Rev. Accel. Beams 19, 064201] Published Thu Jun 16, 2016



Uncoupled thermoelasticity solutions applied on beam dumps

2016-06-13T10:00:00-04:00

Author(s): A. Ouzia and T. Antonakakis
In particle accelerators the process of beam absorption is vital. At CERN particle beams are accelerated at energies of the order of TeV. In the event of a system failure or following collisions, the beam needs to be safely absorbed by dedicated protecting blocks. The thermal shock caused by the rap…
[Phys. Rev. Accel. Beams 19, 063501] Published Mon Jun 13, 2016



Three-dimensional analysis of the surface mode supported in Čerenkov and Smith-Purcell free-electron lasers

2016-06-10T10:00:00-04:00

Author(s): Yashvir Kalkal and Vinit Kumar
In Čerenkov and Smith-Purcell free-electron lasers (FELs), a resonant interaction between the electron beam and the copropagating surface mode can produce a copious amount of coherent terahertz radiation. We perform a three-dimensional (3D) analysis of the surface mode, taking the effect of attenuat…
[Phys. Rev. Accel. Beams 19, 060702] Published Fri Jun 10, 2016



Plasma-driven ultrashort bunch diagnostics

2016-06-10T10:00:00-04:00

Author(s): I. Dornmair, C. B. Schroeder, K. Floettmann, B. Marchetti, and A. R. Maier

High fields available in a plasma can be exploited to streak an electron bunch injected off-axis, pushing temporal resolution down to sub-fs in a mm-scale device.

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[Phys. Rev. Accel. Beams 19, 062801] Published Fri Jun 10, 2016



Improving Touschek lifetime in ultralow-emittance lattices through systematic application of successive closed vertical dispersion bumps

2016-06-09T10:00:00-04:00

Author(s): J. Breunlin, S. C. Leemann, and Å. Andersson
In present ultralow-emittance storage ring designs the emittance coupling required for the production of vertically diffraction-limited synchrotron radiation in the hard x-ray regime is achieved and in many cases surpassed by a correction of the orbit and the linear optics alone. However, operating …
[Phys. Rev. Accel. Beams 19, 060701] Published Thu Jun 09, 2016



Advanced simulation study on bunch gap transient effect

2016-06-09T10:00:00-04:00

Author(s): Tetsuya Kobayashi and Kazunori Akai
Bunch phase shift along the train due to a bunch gap transient is a concern in high-current colliders. In KEKB operation, the measured phase shift along the train agreed well with a simulation and a simple analytical form in most part of the train. However, a rapid phase change was observed at the l…
[Phys. Rev. Accel. Beams 19, 062001] Published Thu Jun 09, 2016



Design of a triple-bend isochronous achromat with minimum coherent-synchrotron-radiation-induced emittance growth

2016-06-09T10:00:00-04:00

Author(s): M. Venturini
Using a 1D steady-state free-space coherent synchrotron radiation (CSR) model, we identify a special design setting for a triple-bend isochronous achromat that yields vanishing emittance growth from CSR. When a more refined CSR model with transient effects is included in the analysis, numerical simu…
[Phys. Rev. Accel. Beams 19, 064401] Published Thu Jun 09, 2016



Intrinsic nonlinear effects of dipole magnets in small rings

2016-06-03T10:00:00-04:00

Author(s): H. S. Xu, W. H. Huang, C. X. Tang, and S. Y. Lee
We find that dynamic aperture depends significantly on the bending radii of dipole magnets when designing a small storage ring for Tsinghua Thomson scattering X-ray source (TTX) mainly because of the nonlinearity of the dipole field. In this paper, we present systematic studies on the intrinsic-geom…
[Phys. Rev. Accel. Beams 19, 064001] Published Fri Jun 03, 2016



High-energy in-beam neutron measurements of metal-based shielding for accelerator-driven spallation neutron sources

2016-05-31T10:00:00-04:00

Author(s): D. D. DiJulio, C. P. Cooper-Jensen, H. Björgvinsdóttir, Z. Kokai, and P. M. Bentley
Metal-based shielding plays an important role in the attenuation of harmful and unwanted radiation at an accelerator-driven spallation neutron source. At the European Spallation Source, currently under construction in Lund, Sweden, metal-based materials are planned to be used extensively as neutron …
[Phys. Rev. Accel. Beams 19, 053501] Published Tue May 31, 2016



Seeded free electron laser operating with two colors: Comments on experimental results

2016-05-26T10:00:00-04:00

Author(s): M. Carpanese, F. Ciocci, G. Dattoli, A. Petralia, V. Petrillo, and A. Torre
Free electron lasers operating with two colors are promising devices for applications. The relevant modelization has provided a good understanding of the underlying physics. In this paper we present an analysis of the experimental results obtained at SPARC_LAB concerning seeded two-colors free elect…
[Phys. Rev. Accel. Beams 19, 050703] Published Thu May 26, 2016



Energy enhancement and spectrum narrowing in terahertz electron sources due to negative mass instability

2016-05-26T10:00:00-04:00

Author(s): Yu. Lurie, V. L. Bratman, and A. V. Savilov
Simulations of coherent spontaneous undulator radiation in a waveguide demonstrate that the use of negative mass instability (NMI) for retaining longitudinal sizes of dense electron bunches, which are formed in laser-driven photoinjectors, allows one to increase power capabilities of a terahertz rad…
[Phys. Rev. Accel. Beams 19, 050704] Published Thu May 26, 2016



Approach to combined-function magnets via symplectic slicing

2016-05-26T10:00:00-04:00

Author(s): M. Titze
In this article we describe how to obtain symplectic “slice” maps for combined-function magnets, by using a method of generating functions. A feature of this method is that one can use an unexpanded and unsplit Hamiltonian. From such a slice map we obtain a first-order map which is symplectic at the…
[Phys. Rev. Accel. Beams 19, 054002] Published Thu May 26, 2016



Two-color beam generation based on wakefield excitation

2016-05-25T10:00:00-04:00

Author(s): S. Bettoni, E. Prat, and S. Reiche
Several beam manipulation methods have been studied and experimentally tested to generate two-color photon beams in free electron laser facilities to accommodate the user requests. We propose to use the interaction of the beam with an oscillating longitudinal wakefield source to obtain a suitable el…
[Phys. Rev. Accel. Beams 19, 050702] Published Wed May 25, 2016



Adaptive robust control of longitudinal and transverse electron beam profiles

2016-05-25T10:00:00-04:00

Author(s): Amin Rezaeizadeh, Thomas Schilcher, and Roy S. Smith
Feedback control of the longitudinal and transverse electron beam profiles are considered to be critical for beam control in accelerators. In the feedback scheme, the longitudinal or transverse beam profile is measured and compared to a desired profile to give an error estimate. The error is then us…
[Phys. Rev. Accel. Beams 19, 052802] Published Wed May 25, 2016



New method of calculating the wakefields of a point charge in a waveguide of arbitrary cross section

2016-05-23T10:00:00-04:00

Author(s): S. S. Baturin and A. D. Kanareykin

The high-frequency limit of electromagnetic fields is derived for a relativistic point-charge passing through a waveguide of arbitrary cross section with an arbitrary material boundary.

(image)
[Phys. Rev. Accel. Beams 19, 051001] Published Mon May 23, 2016



Sub-fs electron bunch generation with sub-10-fs bunch arrival-time jitter via bunch slicing in a magnetic chicane

2016-05-19T10:00:00-04:00

Author(s): J. Zhu, R. W. Assmann, M. Dohlus, U. Dorda, and B. Marchetti
The generation of ultrashort electron bunches with ultrasmall bunch arrival-time jitter is of vital importance for laser-plasma wakefield acceleration with external injection. We study the production of 100-MeV electron bunches with bunch durations of subfemtosecond (fs) and bunch arrival-time jitte…
[Phys. Rev. Accel. Beams 19, 054401] Published Thu May 19, 2016



Cold vacuum chamber for diagnostics: Analysis of the measurements at the Diamond Light Source and impedance bench measurements

2016-05-18T10:00:00-04:00

Author(s): R. Voutta, S. Gerstl, S. Casalbuoni, A. W. Grau, T. Holubek, D. Saez de Jauregui, R. Bartolini, M. P. Cox, E. C. Longhi, G. Rehm, J. C. Schouten, R. P. Walker, M. Migliorati, and B. Spataro
The beam heat load is an important input parameter needed for the cryogenic design of superconducting insertion devices. Theoretical models taking into account the different heating mechanisms of an electron beam to a cold bore predict smaller values than the ones measured with several superconducti…
[Phys. Rev. Accel. Beams 19, 053201] Published Wed May 18, 2016



Diagnostics of a charge breeder electron cyclotron resonance ion source helium plasma with the injection of ^{23} Na^{1+} ions

2016-05-16T10:00:00-04:00

Author(s): O. Tarvainen, H. Koivisto, A. Galatà, J. Angot, T. Lamy, T. Thuillier, P. Delahaye, L. Maunoury, D. Mascali, and L. Neri
This work describes the utilization of an injected ^{23}Na^{1+} ion beam as a diagnostics of the helium plasma of a charge breeder electron cyclotron resonance ion source. The obtained data allows estimating the upper limit for the ion-ion collision mean-free path of the incident sodium ions, the lo…
[Phys. Rev. Accel. Beams 19, 053402] Published Mon May 16, 2016



High gradient quadrupoles for low emittance storage rings

2016-05-09T10:00:00-04:00

Author(s): G. Le Bec, J. Chavanne, C. Benabderrahmane, L. Farvacque, L. Goirand, S. Liuzzo, P. Raimondi, and F. Villar
High gradient quadrupoles are key components for the coming generation of storage ring based light sources. The typical specifications of these magnets are: almost 100  T/m gradient, half a meter long, and a vertical aperture for the extraction of the x-ray beam. This paper presents the preparation …
[Phys. Rev. Accel. Beams 19, 052401] Published Mon May 09, 2016



Performance of a first generation X-band photoelectron rf gun

2016-05-04T10:00:00-04:00

Author(s): C. Limborg-Deprey, C. Adolphsen, D. McCormick, M. Dunning, K. Jobe, H. Li, T. Raubenheimer, A. Vrielink, T. Vecchione, F. Wang, and S. Weathersby
Building more compact accelerators to deliver high brightness electron beams for the generation of high flux, highly coherent radiation is a priority for the photon science community. A relatively straightforward reduction in footprint can be achieved by using high-gradient X-band (11.4 GHz) rf tech…
[Phys. Rev. Accel. Beams 19, 053401] Published Wed May 04, 2016



Experimental measurements of rf breakdowns and deflecting gradients in mm-wave metallic accelerating structures

2016-05-03T10:00:00-04:00

Author(s): Massimo Dal Forno, Valery Dolgashev, Gordon Bowden, Christine Clarke, Mark Hogan, Doug McCormick, Alexander Novokhatski, Bruno Spataro, Stephen Weathersby, and Sami G. Tantawi
We present an experimental study of a high gradient metallic accelerating structure at sub-THz frequencies, where we investigated the physics of rf breakdowns. Wakefields in the structure were excited by an ultrarelativistic electron beam. We present the first quantitative measurements of gradients …
[Phys. Rev. Accel. Beams 19, 051302] Published Tue May 03, 2016



Harmonically resonant cavity as a bunch-length monitor

2016-05-03T10:00:00-04:00

Author(s): B. Roberts, F. Hannon, M. M. Ali, E. Forman, J. Grames, R. Kazimi, W. Moore, M. Pablo, M. Poelker, A. Sanchez, and D. Speirs
A compact, harmonically resonant cavity with fundamental resonant frequency 1497 MHz was used to evaluate the temporal characteristics of electron bunches produced by a 130 kV dc high voltage spin-polarized photoelectron source at the Continuous Electron Beam Accelerator Facility (CEBAF) photoinject…
[Phys. Rev. Accel. Beams 19, 052801] Published Tue May 03, 2016



Using ac dipoles to localize sources of beam coupling impedance

2016-05-03T10:00:00-04:00

Author(s): N. Biancacci and R. Tomás
The beam coupling impedance is one of the main sources of beam instabilities and emittance blow up in circular accelerators. A refined machine impedance evaluation is therefore required in order to understand and model intensity dependent effects and instabilities that may limit the machine performa…
[Phys. Rev. Accel. Beams 19, 054001] Published Tue May 03, 2016



Microbunching-instability-induced sidebands in a seeded free-electron laser

2016-05-02T10:00:00-04:00

Author(s): Zhen Zhang, Ryan Lindberg, William M. Fawley, Zhirong Huang, Jacek Krzywinski, Alberto Lutman, Gabriel Marcus, and Agostino Marinelli
Measurements of the multishot-averaged, soft x-ray, self-seeding spectrum at the LCLS free-electron laser often have a pedestal-like distribution around the seeded wavelength, which limits the spectral purity and can negatively affect some user applications not employing a post-undulator monochromat…
[Phys. Rev. Accel. Beams 19, 050701] Published Mon May 02, 2016



Supersonic jets of hydrogen and helium for laser wakefield acceleration

2016-05-02T10:00:00-04:00

Author(s): K. Svensson, M. Hansson, F. Wojda, L. Senje, M. Burza, B. Aurand, G. Genoud, A. Persson, C.-G. Wahlström, and O. Lundh
The properties of laser wakefield accelerated electrons in supersonic gas flows of hydrogen and helium are investigated. At identical backing pressure, we find that electron beams emerging from helium show large variations in their spectral and spatial distributions, whereas electron beams accelerat…
[Phys. Rev. Accel. Beams 19, 051301] Published Mon May 02, 2016



Compact hadron driver for cancer therapies using continuous energy sweep scanning

2016-04-26T10:00:00-04:00

Author(s): Leo Kwee Wah, Takumi Monma, Toshikazu Adachi, Tadamichi Kawakubo, Tanuja Dixit, and Ken Takayama
A design of a compact hadron driver for future cancer therapies based on the induction synchrotron concept is presented. To realize a slow extraction technique in a fast-cycling synchrotron, which allows energy sweep beam scanning, a zero momentum-dispersion D(s) region and a high flat D(s) region a…
[Phys. Rev. Accel. Beams 19, 042802] Published Tue Apr 26, 2016



Interdigital H-mode drift-tube linac design with alternative phase focusing for muon linac

2016-04-25T10:00:00-04:00

Author(s): M. Otani, T. Mibe, M. Yoshida, K. Hasegawa, Y. Kondo, N. Hayashizaki, Y. Iwashita, Y. Iwata, R. Kitamura, and N. Saito
We have developed an interdigital H-mode (IH) drift-tube linac (DTL) design with an alternative phase focusing (APF) scheme for a muon linac, in order to measure the anomalous magnetic moment and electric dipole moment (EDM) of muons at the Japan Proton Accelerator Research Complex (J-PARC). The IH-…
[Phys. Rev. Accel. Beams 19, 040101] Published Mon Apr 25, 2016



Genetic algorithm for chromaticity correction in diffraction limited storage rings

2016-04-25T10:00:00-04:00

Author(s): M. P. Ehrlichman
A multiobjective genetic algorithm is developed for optimizing nonlinearities in diffraction limited storage rings. This algorithm determines sextupole and octupole strengths for chromaticity correction that deliver optimized dynamic aperture and beam lifetime. The algorithm makes use of dominance c…
[Phys. Rev. Accel. Beams 19, 044001] Published Mon Apr 25, 2016



Combining harmonic generation and laser chirping to achieve high spectral density in Compton sources

2016-04-25T10:00:00-04:00

Author(s): Balša Terzić, Cody Reeves, and Geoffrey A. Krafft
Recently various laser-chirping schemes have been investigated with the goal of reducing or eliminating ponderomotive line broadening in Compton or Thomson scattering occurring at high laser intensities. As a next level of detail in the spectrum calculations, we have calculated the line smoothing an…
[Phys. Rev. Accel. Beams 19, 044403] Published Mon Apr 25, 2016



High energy Coulomb-scattered electrons for relativistic particle beam diagnostics

2016-04-22T10:00:00-04:00

Author(s): P. Thieberger, Z. Altinbas, C. Carlson, C. Chasman, M. Costanzo, C. Degen, K. A. Drees, W. Fischer, D. Gassner, X. Gu, K. Hamdi, J. Hock, A. Marusic, T. Miller, M. Minty, C. Montag, Y. Luo, A. I. Pikin, and S. M. White
A new system used for monitoring energetic Coulomb-scattered electrons as the main diagnostic for accurately aligning the electron and ion beams in the new Relativistic Heavy Ion Collider (RHIC) electron lenses is described in detail. The theory of electron scattering from relativistic ions is devel…
[Phys. Rev. Accel. Beams 19, 041002] Published Fri Apr 22, 2016



Analytical theory of coherent synchrotron radiation wakefield of short bunches shielded by conducting parallel plates

2016-04-21T10:00:00-04:00

Author(s): Gennady Stupakov and Demin Zhou

A general analytical model of coherent synchrotron radiation is developed and applied to a wide range of trajectories and shielding geometries.

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[Phys. Rev. Accel. Beams 19, 044402] Published Thu Apr 21, 2016



Measurement and analysis of the impact of transverse incoherent wakefields in a light source storage ring

2016-04-15T10:00:00-04:00

Author(s): P. Brunelle, R. Nagaoka, and R. Sreedharan
The influence of incoherent wakefields arising from a high current beam circulating in a ring composed of many flat chambers on the beam is analyzed numerically and experimentally for the SOLEIL storage ring. Three distinct ranges of the excited field are studied: the long multiturn regime in multib…
[Phys. Rev. Accel. Beams 19, 044401] Published Fri Apr 15, 2016



Straightforward and accurate technique for post-coupler stabilization in drift tube linac structures

2016-04-12T10:00:00-04:00

Author(s): Mohammad Reza Khalvati and Suitbert Ramberger
The axial electric field of Alvarez drift tube linacs (DTLs) is known to be susceptible to variations due to static and dynamic effects like manufacturing tolerances and beam loading. Post-couplers are used to stabilize the accelerating fields of DTLs against tuning errors. Tilt sensitivity and its …
[Phys. Rev. Accel. Beams 19, 042001] Published Tue Apr 12, 2016



Transverse beam coupling impedance of the CERN Proton Synchrotron

2016-04-08T10:00:00-04:00

Author(s): S. Persichelli, M. Migliorati, N. Biancacci, S. Gilardoni, E. Metral, and B. Salvant
Beam coupling impedance is a fundamental parameter to characterize the electromagnetic interaction of a particle beam with the surrounding environment. Synchrotron machine performances are critically affected by instabilities and collective effects triggered by beam coupling impedance. In particular…
[Phys. Rev. Accel. Beams 19, 041001] Published Fri Apr 08, 2016