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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: 2017-07-25T12:08:44-04:00


Thermally assisted photoemission effect on CeB_{6} and LaB_{6} for application as photocathodes


Author(s): K. Torgasin, K. Morita, H. Zen, K. Masuda, T. Katsurayama, T. Murata, S. Suphakul, H. Yamashita, T. Nogi, T. Kii, K. Nagasaki, and H. Ohgaki
The thermally assisted photoemission (TAPE) effect was investigated for the hexaboride thermionic cathodes (LaB_{6} and CeB_{6}). It was found that the quantum efficiency of these cathodes can be increased by raising the cathode temperature along with the thermionic emission. In addition both materi...
[Phys. Rev. Accel. Beams 20, 073401] Published Tue Jul 25, 2017

Using a Bessel light beam as an ultrashort period helical undulator


Author(s): B. C. Jiang, Q. L. Zhang, J. H. Chen, and Z. T. Zhao
An undulator is a critical component to produce synchrotron radiation and a free electron laser. When a Bessel light beam carrying the orbit angular momentum copropagates with an electron beam bunch, a net transverse deflection force will be subjected to the latter one. As a result of dephasing effe...
[Phys. Rev. Accel. Beams 20, 070701] Published Mon Jul 24, 2017

Analysis of emissions from prebunched electron beams


Author(s): Jia Qika
The emissions of the prebunched electron beam, including the coherent spontaneous emission and the self-amplified stimulated emission, are analyzed by using one-dimensional FEL theory. Neglecting the interaction of the electrons and the radiation field, the formula of the coherent spontaneous emissi...
[Phys. Rev. Accel. Beams 20, 070702] Published Mon Jul 24, 2017

Proton irradiated graphite grades for a long baseline neutrino facility experiment


Author(s): N. Simos, P. Nocera, Z. Zhong, R. Zwaska, N. Mokhov, J. Misek, K. Ammigan, P. Hurh, and Z. Kotsina
In search of a low-Z pion production target for the Long Baseline Neutrino Facility (LBNF) of the Deep Underground Neutrino Experiment (DUNE) four graphite grades were irradiated with protons in the energy range of 140–180 MeV, to peak fluence of ∼6.1×10^{20}  p/cm^{2} and irradiation temperatures b...
[Phys. Rev. Accel. Beams 20, 071002] Published Mon Jul 24, 2017

Dynamics of microparticles in vacuum breakdown: Cranberg’s scenario updated by numerical modeling


Author(s): B. Seznec, Ph. Dessante, T. Jager, L. Caillault, Ph. Teste, and T. Minea
Microparticles (MP) and thermofield emission in vacuum are mainly caused by the roughness present at the surface of electrodes holding a high voltage. They can act as a trigger for breakdown, especially under high vacuum. This theoretical study discusses the interactions between one MP and the therm...
[Phys. Rev. Accel. Beams 20, 073501] Published Mon Jul 24, 2017

Crystal collimator systems for high energy frontier


Author(s): A. I. Sytov, V. V. Tikhomirov, and A. S. Lobko
Crystalline collimators can potentially considerably improve the cleaning performance of the presently used collimator systems using amorphous collimators. A crystal-based collimation scheme which relies on the channeling particle deflection in bent crystals has been proposed and extensively studied...
[Phys. Rev. Accel. Beams 20, 071001] Published Thu Jul 13, 2017

Erratum: Eigenmode compendium of the third harmonic module of the European X-ray Free Electron Laser [Phys. Rev. Accel. Beams 20, 042002 (2017)]


Author(s): Thomas Flisgen, Johann Heller, Tomasz Galek, Liangliang Shi, Nirav Joshi, Nicoleta Baboi, Roger M. Jones, and Ursula van Rienen
[Phys. Rev. Accel. Beams 20, 079901] Published Thu Jul 13, 2017

Spin tune mapping as a novel tool to probe the spin dynamics in storage rings


Author(s): A. Saleev et al. (JEDI collaboration)

The stable spin direction of polarized particles in a storage ring was determined first experimentally, through an accurate measurement of the spin tune and its response to longitudinal magnetic fields.

[Phys. Rev. Accel. Beams 20, 072801] Published Fri Jul 07, 2017

Hamiltonian approach to slip-stacking dynamics


Author(s): S. Y. Lee and K. Y. Ng
Hamiltonian dynamics has been applied to study the slip-stacking dynamics. The canonical-perturbation method is employed to obtain the second-harmonic correction term in the slip-stacking Hamiltonian. The Hamiltonian approach provides a clear optimal method for choosing the slip-stacking parameter a...
[Phys. Rev. Accel. Beams 20, 064202] Published Thu Jun 29, 2017

Challenges of in-vacuum and cryogenic permanent magnet undulator technologies


Author(s): Jui-Che Huang, Hideo Kitamura, Chin-Kang Yang, Cheng-Hsing Chang, Cheng-Hsiang Chang, and Ching-Shiang Hwang
An in-vacuum undulator (IVU) provides a means to reach high-brilliance x rays in medium energy storage rings. The development of short period undulators with low phase errors creates the opportunity for an unprecedented brilliant light source in a storage ring. Since the spectral quality from cryoge...
[Phys. Rev. Accel. Beams 20, 064801] Published Thu Jun 29, 2017

Phase jump method for efficiency enhancement in free-electron lasers


Author(s): Alan Mak, Francesca Curbis, and Sverker Werin
The efficiency of a free-electron laser can be enhanced by the phase jump method. The method utilizes the phase-shifting chicanes in the drift sections between the undulator segments. By applying appropriate phase jumps, the microbunched electron beam can decelerate and radiate coherently beyond the...
[Phys. Rev. Accel. Beams 20, 060703] Published Thu Jun 22, 2017

Coherent resonance stop bands in alternating gradient beam transport


Author(s): K. Ito, H. Okamoto, Y. Tokashiki, and K. Fukushima
An extensive experimental study is performed to confirm fundamental resonance bands of an intense hadron beam propagating through an alternating gradient linear transport channel. The present work focuses on the most common lattice geometry called “FODO” or “doublet” that consists of two quadrupoles...
[Phys. Rev. Accel. Beams 20, 064201] Published Thu Jun 22, 2017

Achievement of a low-loss 1-MW beam operation in the 3-GeV rapid cycling synchrotron of the Japan Proton Accelerator Research Complex


Author(s): H. Hotchi, H. Harada, N. Hayashi, S. Kato, M. Kinsho, K. Okabe, P. K. Saha, Y. Shobuda, F. Tamura, N. Tani, Y. Watanabe, K. Yamamoto, M. Yamamoto, and M. Yoshimoto
The 3-GeV rapid cycling synchrotron (RCS) of the Japan Proton Accelerator Research Complex (J-PARC) is now in the final beam commissioning phase, aiming for a design output beam power of 1 MW. With a series of injector linac upgrades in 2013 and 2014, RCS developed a high-intensity beam test, and la...
[Phys. Rev. Accel. Beams 20, 060402] Published Mon Jun 19, 2017

Direct measurement of the image displacement instability in a linear induction accelerator


Author(s): T. J. Burris-Mog, C. A. Ekdahl, and D. C. Moir
The image displacement instability (IDI) has been measured on the 20 MeV Axis I of the dual axis radiographic hydrodynamic test facility and compared to theory. A 0.23 kA electron beam was accelerated across 64 gaps in a low solenoid focusing field, and the position of the beam centroid was measured...
[Phys. Rev. Accel. Beams 20, 060403] Published Mon Jun 19, 2017

Sensitivity of echo enabled harmonic generation to sinusoidal electron beam energy structure


Author(s): E. Hemsing, B. Garcia, Z. Huang, T. Raubenheimer, and D. Xiang
We analytically examine the bunching factor spectrum of a relativistic electron beam with sinusoidal energy structure that then undergoes an echo-enabled harmonic generation (EEHG) transformation to produce high harmonics. The performance is found to be described primarily by a simple scaling parame...
[Phys. Rev. Accel. Beams 20, 060702] Published Mon Jun 19, 2017

LHC optics commissioning: A journey towards 1% optics control


Author(s): T. Persson, F. Carlier, J. Coello de Portugal, A. Garcia-Tabares Valdivieso, A. Langner, E. H. Maclean, L. Malina, P. Skowronski, B. Salvant, R. Tomás, and A. C. García Bonilla

Enhanced optics-correction techniques have supported LHC operation and allowed a control of these beta functions to better than 1%, ensuring equal luminosity in the two main experiments.

[Phys. Rev. Accel. Beams 20, 061002] Published Mon Jun 19, 2017

Laser-triggered proton acceleration from hydrogenated low-density targets


Author(s): A. V. Brantov, E. A. Obraztsova, A. L. Chuvilin, E. D. Obraztsova, and V. Yu. Bychenkov
Synchronized proton acceleration by ultraintense slow light (SASL) in low-density targets has been studied in application to fabricated carbon nanotube films. Proton acceleration from low-density plasma films irradiated by a linearly polarized femtosecond laser pulse of ultrarelativistic intensity w...
[Phys. Rev. Accel. Beams 20, 061301] Published Mon Jun 19, 2017

Upper limit for the accelerating gradient in the collinear wakefield accelerator as a function of the transformer ratio


Author(s): S. S. Baturin and A. Zholents
The interrelation between the accelerating gradient and the transformer ratio in the collinear wakefield accelerator has been analyzed. It has been shown that the high transformer ratio and the high efficiency of the energy transfer from the drive bunch to the witness bunch can only be achieved at t...
[Phys. Rev. Accel. Beams 20, 061302] Published Mon Jun 19, 2017

Lattice design and expected performance of the Muon Ionization Cooling Experiment demonstration of ionization cooling


Author(s): M. Bogomilov et al. (The MICE collaboration)

Detailed simulations yield the expected emittance reduction including statistical uncertainty for a revised experimental demonstration of muon ionization cooling.

[Phys. Rev. Accel. Beams 20, 063501] Published Mon Jun 19, 2017

Transverse beam splitting made operational: Key features of the multiturn extraction at the CERN Proton Synchrotron


Author(s): A. Huschauer, A. Blas, J. Borburgh, S. Damjanovic, S. Gilardoni, M. Giovannozzi, M. Hourican, K. Kahle, G. Le Godec, O. Michels, G. Sterbini, and C. Hernalsteens
Following a successful commissioning period, the multiturn extraction (MTE) at the CERN Proton Synchrotron (PS) has been applied for the fixed-target physics programme at the Super Proton Synchrotron (SPS) since September 2015. This exceptional extraction technique was proposed to replace the long-s...
[Phys. Rev. Accel. Beams 20, 061001] Published Wed Jun 14, 2017

Coherent synchrotron radiation by electrons moving on circular orbits


Author(s): Yunhai Cai
We study coherent synchrotron radiation by electrons in the Frenet-Serret coordinate system with a constant curvature 1/ρ. Based on the Hamiltonian in the Courant-Synder theory of particle accelerators, we find in general that the transverse force is essentially the Lorentz force but with a substitu...
[Phys. Rev. Accel. Beams 20, 064402] Published Wed Jun 14, 2017

Influence of the injected beam parameters on the capture efficiency of an electron cyclotron resonance based charge breeder


Author(s): A. Galatà, D. Mascali, G. Torrisi, L. Neri, L. Celona, and J. Angot
Electron cyclotron resonance ion sources based charge breeders (ECR-CB) are fundamental devices for Isotope Separation On Line (ISOL) facilities aiming at postaccelerating radioactive ion beams (RIBs). Presently, low intensity RIBs do not allow a conventional tuning of the ECR-CB: as a consequence, ...
[Phys. Rev. Accel. Beams 20, 063401] Published Tue Jun 13, 2017

Higher-order formulas of amplitude-dependent tune shift caused by a sextupole magnetic field distribution


Author(s): Kouichi Soutome and Hitoshi Tanaka
Nowadays, designs for ring-based light sources use multibend lattices for achieving a very small emittance of around 100 pmrad. In this type of storage ring, the chromaticity correcting sextupoles generally have greater strengths than those used in typical third-generation light sources. Therefore, ...
[Phys. Rev. Accel. Beams 20, 064001] Published Tue Jun 13, 2017

Evaluation of the CERN Super Proton Synchrotron longitudinal impedance from measurements of the quadrupole frequency shift


Author(s): A. Lasheen and E. Shaposhnikova
Longitudinal instabilities are one of the main limitations in the CERN Super Proton Synchrotron (SPS) to reach the beam parameters required for the High Luminosity LHC project. In preparation to the SPS upgrade, possible remedies are studied by performing macroparticle simulations using the machine ...
[Phys. Rev. Accel. Beams 20, 064401] Published Tue Jun 13, 2017

Comparison of coaxial higher order mode couplers for the CERN Superconducting Proton Linac study


Author(s): K. Papke, F. Gerigk, and U. van Rienen
Higher order modes (HOMs) may affect beam stability and refrigeration requirements of superconducting proton linacs such as the Superconducting Proton Linac, which is studied at CERN. Under certain conditions beam-induced HOMs can accumulate sufficient energy to destabilize the beam or quench the su...
[Phys. Rev. Accel. Beams 20, 060401] Published Mon Jun 12, 2017

Design and first operation of a supersonic gas jet based beam profile monitor


Author(s): Vasilis Tzoganis, Hao D. Zhang, Adam Jeff, and Carsten P. Welsch
Noninterceptive beam profile monitors are of great importance for many particle accelerators worldwide. Extra challenges are posed by high energy, high intensity machines and low energy low intensity accelerators. For these applications, existing diagnostics are no longer suitable due to the high po...
[Phys. Rev. Accel. Beams 20, 062801] Published Mon Jun 12, 2017

Single shot, double differential spectral measurements of inverse Compton scattering in the nonlinear regime


Author(s): Y. Sakai, I. Gadjev, P. Hoang, N. Majernik, A. Nause, A. Fukasawa, O. Williams, M. Fedurin, B. Malone, C. Swinson, K. Kusche, M. Polyanskiy, M. Babzien, M. Montemagno, Z. Zhong, P. Siddons, I. Pogorelsky, V. Yakimenko, T. Kumita, Y. Kamiya, and J. B. Rosenzweig
Inverse Compton scattering (ICS) is a unique mechanism for producing fast pulses—picosecond and below—of bright photons, ranging from x to γ rays. These nominally narrow spectral bandwidth electromagnetic radiation pulses are efficiently produced in the interaction between intense, well-focused elec...
[Phys. Rev. Accel. Beams 20, 060701] Published Mon Jun 05, 2017

Improvements on the stability and operation of a magnetron H^{−} ion source


Author(s): A. Sosa, D. S. Bollinger, P. R. Karns, and C. Y. Tan
The magnetron H^{−} ion sources developed in the 1970s currently in operation at Fermilab provide beam to the rest of the accelerator complex. A series of modifications to these sources have been tested in a dedicated off-line test stand with the aim of improving different operational issues. The so...
[Phys. Rev. Accel. Beams 20, 050102] Published Wed May 31, 2017

Design study of a low-emittance high-repetition rate thermionic rf gun


Author(s): A. Opanasenko, V. Mytrochenko, V. Zhaunerchyk, and V. A. Goryashko
We propose a novel gridless continuous-wave radiofrequency (rf) thermionic gun capable of generating nC ns electron bunches with a rms normalized slice emittance close to the thermal level of 0.3 mm mrad. In order to gate the electron emission, an externally heated thermionic cathode is installed in...
[Phys. Rev. Accel. Beams 20, 053401] Published Wed May 31, 2017

Review of linear optics measurement and correction for charged particle accelerators


Author(s): Rogelio Tomás, Masamitsu Aiba, Andrea Franchi, and Ubaldo Iriso

Linear optics measurements and correction for charged particle beams are reviewed, including the historical path, recent trends, and a comparison of different approaches, providing a valuable reference for years to come.

[Phys. Rev. Accel. Beams 20, 054801] Published Wed May 31, 2017

Control of tunable, monoenergetic laser-plasma-accelerated electron beams using a shock-induced density downramp injector


Author(s): K. K. Swanson, H.-E. Tsai, S. K. Barber, R. Lehe, H.-S. Mao, S. Steinke, J. van Tilborg, K. Nakamura, C. G. R. Geddes, C. B. Schroeder, E. Esarey, and W. P. Leemans
Control of the properties of laser-plasma-accelerated electron beams that were injected along a shock-induced density downramp through precision tailoring of the density profile was demonstrated using a 1.8 J, 45 fs laser interacting with a mm-scale gas jet. The effects on the beam spatial profile, ...
[Phys. Rev. Accel. Beams 20, 051301] Published Tue May 30, 2017

Joule heating in a flat dechirper


Author(s): Karl Bane, Gennady Stupakov, and Erion Gjonaj
We perform Joule power loss calculations for a flat dechirper. We consider the configurations of the beam on-axis between the two plates—for chirp control—and for the beam especially close to one plate—for use as a fast kicker. Our calculations use a surface impedance approach, one that is valid whe...
[Phys. Rev. Accel. Beams 20, 054403] Published Tue May 30, 2017

Optical circular deflector with attosecond resolution for ultrashort electron beam


Author(s): Zhen Zhang, Yingchao Du, Chuanxiang Tang, Yuantao Ding, and Zhirong Huang

The resonant interaction of an electron beam passing through a helical undulator with a radially polarized laser pulse allows measuring the longitudinal bunch profile with attosecond resolution.

[Phys. Rev. Accel. Beams 20, 050702] Published Thu May 25, 2017

Start-to-end simulation of the shot-noise driven microbunching instability experiment at the Linac Coherent Light Source


Author(s): J. Qiang, Y. Ding, P. Emma, Z. Huang, D. Ratner, T. O. Raubenheimer, M. Venturini, and F. Zhou
The shot-noise driven microbunching instability can significantly degrade electron beam quality in x-ray free electron laser light sources. Experiments were carried out at the Linac Coherent Light Source (LCLS) to study this instability. In this paper, we present start-to-end simulations of the shot...
[Phys. Rev. Accel. Beams 20, 054402] Published Tue May 23, 2017

Symplectic modeling of beam loading in electromagnetic cavities


Author(s): Dan T. Abell, Nathan M. Cook, and Stephen D. Webb
Simulating beam loading in radio frequency accelerating structures is critical for understanding higher-order mode effects on beam dynamics, such as beam break-up instability in energy recovery linacs. Full wave simulations of beam loading in radio frequency structures are computationally expensive,...
[Phys. Rev. Accel. Beams 20, 052002] Published Mon May 22, 2017

Vlasov analysis of microbunching instability for magnetized beams


Author(s): C.-Y. Tsai, Ya. S. Derbenev, D. Douglas, R. Li, and C. Tennant
For a high-brightness electron beam with high bunch charge traversing a recirculation beam line, coherent synchrotron radiation and space charge effects may result in microbunching instability (MBI). Both tracking simulation and Vlasov analysis for an early design of a circulator cooler ring (CCR) f...
[Phys. Rev. Accel. Beams 20, 054401] Published Fri May 19, 2017

High brilliance uranium beams for the GSI FAIR


Author(s): W. Barth, A. Adonin, Ch. E. Düllmann, M. Heilmann, R. Hollinger, E. Jäger, O. Kester, J. Khuyagbaatar, J. Krier, E. Plechov, P. Scharrer, W. Vinzenz, H. Vormann, A. Yakushev, and S. Yaramyshev
The 40 years old GSI-UNILAC (Universal Linear Accelerator) as well as the heavy ion synchrotron SIS18 will serve as a high current heavy ion injector for the new FAIR (Facility for Antiproton and Ion Research) synchrotron SIS100. In the context of an advanced machine investigation program in combina...
[Phys. Rev. Accel. Beams 20, 050101] Published Mon May 15, 2017

Collision monochromatization in e^{+}e^{−} colliders


Author(s): A. Bogomyagkov and E. Levichev
The manuscript describes several monochromatization schemes starting from A. Renieri’s [Report No. LNF-75/6(R)] proposal for head-on collisions based on correlation between particles transverse position and energy deviation. We briefly explain the initial proposal and expand it for crossing angle co...
[Phys. Rev. Accel. Beams 20, 051001] Published Mon May 15, 2017

High-gradient breakdown studies of an X-band Compact Linear Collider prototype structure


Author(s): Xiaowei Wu, Jiaru Shi, Huaibi Chen, Jiahang Shao, Tetsuo Abe, Toshiyasu Higo, Shuji Matsumoto, and Walter Wuensch
A Compact Linear Collider prototype traveling-wave accelerator structure fabricated at Tsinghua University was recently high-gradient tested at the High Energy Accelerator Research Organization (KEK). This X-band structure showed good high-gradient performance of up to 100  MV/m and obtained a break...
[Phys. Rev. Accel. Beams 20, 052001] Published Mon May 08, 2017

Generation of high-power, tunable terahertz radiation from laser interaction with a relativistic electron beam


Author(s): Zhen Zhang, Lixin Yan, Yingchao Du, Wenhui Huang, Chuanxiang Tang, and Zhirong Huang
We propose a method based on the slice energy spread modulation to generate strong subpicosecond density bunching in high-intensity relativistic electron beams. A laser pulse with periodic intensity envelope is used to modulate the slice energy spread of the electron beam, which can then be converte...
[Phys. Rev. Accel. Beams 20, 050701] Published Fri May 05, 2017

Fast and precise technique for magnet lattice correction via sine-wave excitation of fast correctors


Author(s): X. Yang, V. Smaluk, L. H. Yu, Y. Tian, and K. Ha
A novel technique has been developed to improve the precision and shorten the measurement time of the LOCO (linear optics from closed orbits) method. This technique, named AC LOCO, is based on sine-wave (ac) beam excitation via fast correctors. Such fast correctors are typically installed at synchro...
[Phys. Rev. Accel. Beams 20, 054001] Published Tue May 02, 2017

Confining continuous manipulations of accelerator beam-line optics


Author(s): Ph. Amstutz, T. Plath, S. Ackermann, J. Bödewadt, C. Lechner, and M. Vogt
Altering the optics in one section of a linear accelerator beam line will in general cause an alteration of the optics in all downstream sections. In circular accelerators, changing the optical properties of any beam-line element will have an impact on the optical functions throughout the whole mach...
[Phys. Rev. Accel. Beams 20, 042802] Published Fri Apr 28, 2017

Fabrication and vertical test experience of the European X-ray Free Electron Laser 3.9 GHz superconducting cavities


Author(s): P. Pierini, M. Bertucci, A. Bosotti, J. F. Chen, C. G. Maiano, P. Michelato, L. Monaco, M. Moretti, C. Pagani, R. Paparella, D. Sertore, and E. Vogel
We report the experience of the production, processing and qualification testing of the superconducting radio frequency cavities at 3.9 GHz for the third harmonic system at the European XFEL (EXFEL) injector. The rf structure concept, originally developed for the FLASH FEL facility, was adapted to t...
[Phys. Rev. Accel. Beams 20, 042006] Published Thu Apr 27, 2017

Low emittance design of the electron gun and the focusing channel of the Compact Linear Collider drive beam


Author(s): M. Dayyani Kelisani, S. Doebert, and M. Aslaninejad
For the Compact Linear Collider project at CERN, the power for the main linacs is extracted from a drive beam generated from a high current electron source. The design of the electron source and its subsequent focusing channel has a great impact on the beam dynamic considerations of the drive beam. ...
[Phys. Rev. Accel. Beams 20, 043403] Published Thu Apr 27, 2017

Publisher’s Note: Design of beam optics for the future circular collider e^{+}e^{−} collider rings [Phys. Rev. Accel. Beams 19, 111005 (2016)]


Author(s): K. Oide et al.
[Phys. Rev. Accel. Beams 20, 049901] Published Thu Apr 27, 2017

Misalignment measurement of femtosecond electron bunches with THz repetition rate


Author(s): J. Zhu, E. Chiadroni, R. Assmann, M. Bellaveglia, A. Cianchi, M. Ferrario, A. Giribono, B. Marchetti, A. Mostacci, L. Piersanti, R. Pompili, and F. Villa
Generation of a well-aligned bunch train is of vital importance for preserving the beam quality in a plasma wake-field accelerator. The simultaneous measurements of the relative misalignments in both planes, of the individual femtosecond electron bunches with THz repetition rate in a train, are repo...
[Phys. Rev. Accel. Beams 20, 042801] Published Wed Apr 26, 2017

Matter from light-light scattering via Breit-Wheeler events produced by two interacting Compton sources


Author(s): Illya Drebot, D. Micieli, E. Milotti, V. Petrillo, E. Tassi, and L. Serafini
We present the dimensioning of a photon-photon collider based on Compton gamma sources for the observation of Breit-Wheeler pair production and QED γγ events. Two symmetric electron beams, generated by photocathodes and accelerated in linacs, produce two gamma ray beams through Compton back scatteri...
[Phys. Rev. Accel. Beams 20, 043402] Published Wed Apr 26, 2017

Continuous-wave electron linear accelerators for industrial applications


Author(s): D. S. Yurov, A. S. Alimov, B. S. Ishkhanov, and V. I. Shvedunov
Based on Skobeltsyn Institute of Nuclear Physics (SINP) Moscow State University (MSU) experience in developing continuous-wave (cw) normal conducting electron linacs, we propose a design for such accelerators with beam energy of up to 10 MeV and average beam power of up to several hundred kW. An exa...
[Phys. Rev. Accel. Beams 20, 044702] Published Wed Apr 26, 2017

Performance in the vertical test of the 832 nine-cell 1.3 GHz cavities for the European X-ray Free Electron Laser


Author(s): D. Reschke, V. Gubarev, J. Schaffran, L. Steder, N. Walker, M. Wenskat, and L. Monaco

Comprehensive description of the fabrication, surface treatment, and performance of all superconducting cavities for the European X-ray Free Electron Laser project.

[Phys. Rev. Accel. Beams 20, 042004] Published Mon Apr 24, 2017

Validation of the superconducting 3.9 GHz cavity package for the European X-ray Free Electron Laser


Author(s): C. G. Maiano, J. Branlard, M. Hüning, K. Jensch, D. Kostin, A. Matheisen, W.-D. Möller, A. Sulimov, E. Vogel, A. Bosotti, J. F. Chen, M. Moretti, R. Paparella, P. Pierini, and D. Sertore
A full test of the cavity package concept under realistic operating condition was a necessary step before the assembly of the European XFEL (EXFEL) 3.9 GHz superconducting system and its installation in the accelerator. One cavity, equipped with magnetic shielding, power coupler and frequency tuner ...
[Phys. Rev. Accel. Beams 20, 042005] Published Mon Apr 24, 2017

Assessing hydration disturbances from concrete aggregates with radiation shielding properties by isothermal calorimetry


Author(s): Lars Wadsö, Carsten P. Cooper-Jensen, and Phillip M. Bentley
Spallation sources create a large amount of neutrons with energies up to the GeV range. To shield for these neutrons, steel and concrete are important materials. By adding different aggregates to normal concrete, one can improve the shielding effect of the concrete. Some of these aggregates can infl...
[Phys. Rev. Accel. Beams 20, 043502] Published Mon Apr 24, 2017

Measurements of charge state distributions of 0.74 and 1.4  MeV/u heavy ions passing through dilute gases


Author(s): P. Scharrer, Ch. E. Düllmann, W. Barth, J. Khuyagbaatar, A. Yakushev, M. Bevcic, P. Gerhard, L. Groening, K. P. Horn, E. Jäger, J. Krier, and H. Vormann
In many modern heavy-ion accelerator facilities, gas strippers are used to increase the projectile charge state for improving the acceleration efficiency of ion beams to higher energies. For this application, the knowledge on the behavior of charge state distributions of heavy-ions after passing thr...
[Phys. Rev. Accel. Beams 20, 043503] Published Mon Apr 24, 2017

High field septum magnet using a superconducting shield for the Future Circular Collider


Author(s): Dániel Barna
A zero-field cooled superconducting shield is proposed to realize a high-field (3–4 T) septum magnet for the Future Circular Collider hadron-hadron (FCC-hh) ring. Three planned prototypes using different materials and technical solutions are presented, which will be used to evaluate the feasibility ...
[Phys. Rev. Accel. Beams 20, 041002] Published Fri Apr 21, 2017

THz cavities and injectors for compact electron acceleration using laser-driven THz sources


Author(s): Moein Fakhari, Arya Fallahi, and Franz X. Kärtner
We present a design methodology for developing ultrasmall electron injectors and accelerators based on cascaded cavities excited by short multicycle THz pulses obtained from laser-driven THz generation schemes. Based on the developed concept for optimal coupling of the THz pulse, a THz electron inje...
[Phys. Rev. Accel. Beams 20, 041302] Published Thu Apr 20, 2017



Author(s): T. Sakurai, H. Ego, T. Inagaki, T. Asaka, D. Suzuki, S. Miura, and Y. Otake
A high-acceleration-gradient linear accelerator (LINAC) for an x-ray free electron laser (XFEL) offers the advantages of a short accelerator length and low construction costs. In addition, the high pulse repetition rate of the LINAC, which can drive multiple x-ray beam lines, provides additional use...
[Phys. Rev. Accel. Beams 20, 042003] Published Wed Apr 19, 2017

Effect of an angular trajectory kick in a high-gain free-electron laser


Author(s): Panagiotis Baxevanis, Zhirong Huang, and Gennady Stupakov
In a free-electron laser, a transverse momentum offset (or “kick”) results in an oscillation of the centroid of the electron beam about the undulator axis. Studying the influence of this effect on the free-electron laser (FEL) interaction is important both from a tolerance point of view and for its ...
[Phys. Rev. Accel. Beams 20, 040703] Published Tue Apr 18, 2017

Eigenmode compendium of the third harmonic module of the European X-ray Free Electron Laser


Author(s): Thomas Flisgen, Johann Heller, Tomasz Galek, Liangliang Shi, Nirav Joshi, Nicoleta Baboi, Roger M. Jones, and Ursula van Rienen
Chains of superconducting radio-frequency resonators are key components of modern particle accelerators such as the European XFEL, which is currently under construction in the north of Germany. In addition to the accelerating mode of the resonators, their beam excited higher order modes are of speci...
[Phys. Rev. Accel. Beams 20, 042002] Published Tue Apr 18, 2017

Statistical analysis of laser driven protons using a high-repetition-rate tape drive target system


Author(s): Muhammad Noaman-ul-Haq, Hamad Ahmed, Thomas Sokollik, Lule Yu, Zezhou Liu, Xiaohui Yuan, Fang Yuan, Mohammad Mirzaie, Xulei Ge, Liming Chen, and Jie Zhang
One of the challenges for laser-driven proton beams for many potential applications is their stability and reproducibility. We investigate the stability of the laser driven proton beams through statistical analysis of the data obtained by employing a high repetition rate tape driven target system. T...
[Phys. Rev. Accel. Beams 20, 041301] Published Fri Apr 14, 2017

Design of the Compact Linear Collider main linac accelerating structure made from two halves


Author(s): Hao Zha and Alexej Grudiev
Milling on two longitudinally split halves is one method to manufacture accelerating structures. This method is simple and allows one to avoid electromagnetic fields at bonding joints, making it attractive in manufacturing high-gradient accelerating structures. An X-band structure design with strong...
[Phys. Rev. Accel. Beams 20, 042001] Published Fri Apr 14, 2017

High gradient linac for proton therapy


Author(s): S. Benedetti, A. Grudiev, and A. Latina

A new design of a proton accelerator for cancer treatment is fully linear and compact.

[Phys. Rev. Accel. Beams 20, 040101] Published Thu Apr 13, 2017

Analysis and measurement of the transfer matrix of a 9-cell, 1.3-GHz superconducting cavity


Author(s): A. Halavanau, N. Eddy, D. Edstrom, E. Harms, A. Lunin, P. Piot, A. Romanov, J. Ruan, N. Solyak, and V. Shiltsev
Superconducting linacs are capable of producing intense, stable, high-quality electron beams that have found widespread applications in science and industry. The 9-cell, 1.3-GHz superconducting standing-wave accelerating rf cavity originally developed for e^{+}/e^{−} linear-collider applications [B....
[Phys. Rev. Accel. Beams 20, 040102] Published Thu Apr 13, 2017

Magnetic refrigeration down to 1.6 K for the future circular collider e^{+}e^{−}


Author(s): Jakub Tkaczuk, François Millet, Jean-Marc Duval, and Bernard Rousset
High-field superconducting rf cavities of the future circular collider e^{+}e^{−} may require a kW-range superfluid helium refrigeration down to 1.6 K. Magnetic refrigeration operating below 4.2 K can be an alternative to the compression/expansion helium refrigeration. A significant difference betwe...
[Phys. Rev. Accel. Beams 20, 041001] Published Tue Apr 11, 2017

Using the optical-klystron effect to increase and measure the intrinsic beam energy spread in free-electron-laser facilities


Author(s): Eduard Prat, Eugenio Ferrari, Sven Reiche, and Thomas Schietinger
We present a setup based on the optical klystron concept, consisting of two undulator modules separated by a magnetic chicane, that addresses two issues in free-electron-laser (FEL) facilities. On the one hand, it allows increasing the intrinsic energy spread of the beam at the source, which is usef...
[Phys. Rev. Accel. Beams 20, 040702] Published Mon Apr 10, 2017

Sector magnets or transverse electromagnetic fields in cylindrical coordinates


Author(s): T. Zolkin
Laplace’s equation is considered for scalar and vector potentials describing electric or magnetic fields in cylindrical coordinates, with invariance along the azimuthal coordinate. A series of special functions are found which, when expanded to lowest order in power series in radial and vertical coo...
[Phys. Rev. Accel. Beams 20, 043501] Published Mon Apr 10, 2017

Fast instability caused by electron cloud in combined function magnets


Author(s): S. A. Antipov, P. Adamson, A. Burov, S. Nagaitsev, and M.-J. Yang
One of the factors which may limit the intensity in the Fermilab Recycler is a fast transverse instability. It develops within a hundred turns and, in certain conditions, may lead to a beam loss. The high rate of the instability suggests that its cause is electron cloud. We studied the phenomena by ...
[Phys. Rev. Accel. Beams 20, 044401] Published Mon Apr 10, 2017

Impedance-matched Marx generators


Author(s): W. A. Stygar, K. R. LeChien, M. G. Mazarakis, M. E. Savage, B. S. Stoltzfus, K. N. Austin, E. W. Breden, M. E. Cuneo, B. T. Hutsel, S. A. Lewis, G. R. McKee, J. K. Moore, T. D. Mulville, D. J. Muron, D. B. Reisman, M. E. Sceiford, and M. L. Wisher
We have conceived a new class of prime-power sources for pulsed-power accelerators: impedance-matched Marx generators (IMGs). The fundamental building block of an IMG is a brick, which consists of two capacitors connected electrically in series with a single switch. An IMG comprises a single stage o...
[Phys. Rev. Accel. Beams 20, 040402] Published Fri Apr 07, 2017

Spallation-based neutron target for direct studies of neutron-induced reactions in inverse kinematics


Author(s): René Reifarth, Kathrin Göbel, Tanja Heftrich, Mario Weigand, Beatriz Jurado, Franz Käppeler, and Yuri A. Litvinov
We discuss the possibility to build a neutron target for nuclear reaction studies in inverse kinematics utilizing a storage ring and radioactive ion beams. The proposed neutron target is a specially designed spallation target surrounded by a large moderator of heavy water (D_{2}O). We present the re...
[Phys. Rev. Accel. Beams 20, 044701] Published Thu Apr 06, 2017

Generating isolated terawatt-attosecond x-ray pulses via a chirped-laser-enhanced high-gain free-electron laser


Author(s): Zhen Wang, Chao Feng, and Zhentang Zhao
A feasible method is proposed to generate isolated attosecond terawatt x-ray radiation pulses in high-gain free-electron lasers. In the proposed scheme, a frequency chirped laser pulse is employed to generate a gradually varied spacing current enhancement of the electron beam, and a series of spatio...
[Phys. Rev. Accel. Beams 20, 040701] Published Tue Apr 04, 2017

Beam dynamics simulation of a double pass proton linear accelerator


Author(s): Kilean Hwang and Ji Qiang
A recirculating superconducting linear accelerator with the advantage of both straight and circular accelerator has been demonstrated with relativistic electron beams. The acceleration concept of a recirculating proton beam was recently proposed [J. Qiang, Nucl. Instrum. Methods Phys. Res., Sect. A ...
[Phys. Rev. Accel. Beams 20, 040401] Published Mon Apr 03, 2017

Generation of high-energy electron-positron pairs in the collision of a laser-accelerated electron beam with a multipetawatt laser


Author(s): M. Lobet, X. Davoine, E. d’Humières, and L. Gremillet

Integrated simulations show that the production of high-density ultrarelativistic electron-positron pairs are within the reach of upcoming multipetawatt laser facilities.

[Phys. Rev. Accel. Beams 20, 043401] Published Mon Apr 03, 2017

Current-horn suppression for reduced coherent-synchrotron-radiation-induced emittance growth in strong bunch compression


Author(s): T. K. Charles, D. M. Paganin, A. Latina, M. J. Boland, and R. T. Dowd
Control of coherent synchrotron radiation (CSR)-induced emittance growth is essential in linear accelerators designed to deliver very high brightness electron beams. Extreme current values at the head and tail of the electron bunch, resulting from strong bunch compression, are responsible for large ...
[Phys. Rev. Accel. Beams 20, 030705] Published Fri Mar 31, 2017

Erratum: Parametric instabilities in 3D periodically focused beams with space charge [Phys. Rev. Accel. Beams 20, 014202 (2017)]


Author(s): Ingo Hofmann and Oliver Boine-Frankenheim
[Phys. Rev. Accel. Beams 20, 039901] Published Tue Mar 28, 2017

Quench protection analysis integrated in the design of dipoles for the Future Circular Collider


Author(s): Tiina Salmi, Antti Stenvall, Marco Prioli, Janne Ruuskanen, Arjan Verweij, Bernhard Auchmann, Davide Tommasini, Daniel Schoerling, Clement Lorin, Fernando Toral, Maria Durante, Stefania Farinon, Vittorio Marinozzi, Pasquale Fabbricatore, Massimo Sorbi, and Javier Munilla
The EuroCirCol collaboration is designing a 16 T Nb_{3}Sn dipole that can be used as the main bending magnet in a 100 km long 100 TeV hadron-hadron collider. For economic reasons, the magnets need to be as compact as possible, requiring optimization of the cable cross section in different magnetic f...
[Phys. Rev. Accel. Beams 20, 032401] Published Mon Mar 27, 2017

Impact of process parameters and design options on heat leaks of straight cryogenic distribution lines


Author(s): P. Duda, M. Chorowski, and J. Polinski
The Future Circular Collider (FCC) accelerator will require a helium distribution system that will exceed the presently exploited transfer lines by almost 1 order of magnitude. The helium transfer line will contain five process pipes protected against heat leaks by a common thermal shield. The desig...
[Phys. Rev. Accel. Beams 20, 033202] Published Mon Mar 27, 2017

New configuration for efficient and durable copper coating on the outer surface of a tube


Author(s): Irfan Ahmad, Steven F. Chapman, Katherine M. Velas, and Mahadevan Krishnan
A well-adhered copper coating on stainless steel power coupler parts is required in superconducting radio frequency (SRF) accelerators. Radio frequency power coupler parts are complex, tubelike stainless steel structures, which require copper coating on their outer and inner surfaces. Conventional c...
[Phys. Rev. Accel. Beams 20, 033502] Published Mon Mar 27, 2017

Nonuniform discharge currents in active plasma lenses


Author(s): J. van Tilborg, S. K. Barber, H.-E. Tsai, K. K. Swanson, S. Steinke, C. G. R. Geddes, A. J. Gonsalves, C. B. Schroeder, E. Esarey, S. S. Bulanov, N. A. Bobrova, P. V. Sasorov, and W. P. Leemans
Active plasma lenses have attracted interest in novel accelerator applications due to their ability to provide large-field-gradient (short focal length), tunable, and radially symmetric focusing for charged particle beams. However, if the discharge current is not flowing uniformly as a function of r...
[Phys. Rev. Accel. Beams 20, 032803] Published Fri Mar 24, 2017

Real-time observation of dynamic floor motion of the KEKB injector linac with a laser-based alignment system


Author(s): T. Suwada, Y. Enomoto, K. Kakihara, K. Mikawa, and T. Higo
A new remote-controllable sensing system for a laser-based alignment system is in development to measure slow dynamic displacements of the tunnel floor in real time at the KEKB injector linac. Although the injector linac had initially been aligned with a laser-based alignment system, we have found t...
[Phys. Rev. Accel. Beams 20, 033501] Published Tue Mar 21, 2017

Delivering the world’s most intense muon beam


Author(s): S. Cook, R. D’Arcy, A. Edmonds, M. Fukuda, K. Hatanaka, Y. Hino, Y. Kuno, M. Lancaster, Y. Mori, T. Ogitsu, H. Sakamoto, A. Sato, N. H. Tran, N. M. Truong, M. Wing, A. Yamamoto, and M. Yoshida

A significant increase in the muon production and capture rate results from the use of a novel superconducting solenoid magnet.

[Phys. Rev. Accel. Beams 20, 030101] Published Wed Mar 15, 2017

Simulation of transition radiation based beam imaging from tilted targets


Author(s): L. G. Sukhikh, G. Kube, and A. P. Potylitsyn
Transverse beam profile diagnostics in linear electron accelerators is usually based on direct imaging of a beam spot via visible transition radiation. In this case the fundamental resolution limit is determined by radiation diffraction in the optical system. A method to measure beam sizes beyond th...
[Phys. Rev. Accel. Beams 20, 032802] Published Wed Mar 15, 2017

Parallelized Vlasov-Fokker-Planck solver for desktop personal computers


Author(s): Patrik Schönfeldt, Miriam Brosi, Markus Schwarz, Johannes L. Steinmann, and Anke-Susanne Müller
The numerical solution of the Vlasov-Fokker-Planck equation is a well established method to simulate the dynamics, including the self-interaction with its own wake field, of an electron bunch in a storage ring. In this paper we present Inovesa, a modularly extensible program that uses opencl to mass...
[Phys. Rev. Accel. Beams 20, 030704] Published Tue Mar 14, 2017

Modified reverse tapering method to prevent frequency shift of the radiation in the planar undulator


Author(s): Chi Hyun Shim, In Soo Ko, and Yong Woon Parc
This paper presents a modified reverse tapering method to generate a polarized soft x ray in x-ray free-electron lasers (XFELs) with a higher photon power and a shorter undulator length than the simple linear reverse tapering method. In the proposed method, a few untapered planar undulators are adde...
[Phys. Rev. Accel. Beams 20, 030703] Published Mon Mar 13, 2017

Analysis of nonlinear dynamics by square matrix method


Author(s): Li Hua Yu
The nonlinear dynamics of a system with periodic structure can be analyzed using a square matrix. We show that because of the special property of the square matrix constructed for nonlinear dynamics, we can reduce the dimension of the matrix from the original large number for high order calculations...
[Phys. Rev. Accel. Beams 20, 034001] Published Mon Mar 13, 2017

Dump system concepts for the Future Circular Collider


Author(s): W. Bartmann, M. Atanasov, M. J. Barnes, J. Borburgh, F. Burkart, B. Goddard, T. Kramer, A. Lechner, A. Sanz Ull, R. Schmidt, L. S. Stoel, R. Ostojic, J. Rodziewicz, P. van Trappen, and D. Barna
The Future Circular Collider (FCC-hh) beam dump system must provide a safe and reliable extraction and dilution of the stored beam onto a dump absorber. Energy deposition studies show that damage limits of presently used absorber materials will already be reached for single bunches at 50 TeV. A fast...
[Phys. Rev. Accel. Beams 20, 031001] Published Fri Mar 10, 2017

Transverse mode coupling instability threshold with space charge and different wakefields


Author(s): V. Balbekov
Transverse mode coupling instability of a single bunch with space charge (SC) and a wakefield is considered within the framework of the boxcar model. Eigenfunctions of the bunch without a wake are used as a basis for the solution of the equations with the wakefield included. A dispersion equation fo...
[Phys. Rev. Accel. Beams 20, 034401] Published Fri Mar 10, 2017

Design of high gradient, high repetition rate damped C-band rf structures


Author(s): David Alesini, Marco Bellaveglia, Simone Bini, Alessandro Gallo, Valerio Lollo, Luigi Pellegrino, Luca Piersanti, Fabio Cardelli, Mauro Migliorati, Andrea Mostacci, Luigi Palumbo, Simone Tocci, Luca Ficcadenti, and Valerio Pettinacci
The gamma beam system of the European Extreme Light Infrastructure–Nuclear Physics project foresees the use of a multibunch train colliding with a high intensity recirculated laser pulse. The linac energy booster is composed of 12 traveling wave C-band structures, 1.8 m long with a field phase advan...
[Phys. Rev. Accel. Beams 20, 032004] Published Wed Mar 08, 2017

Simplified model for fast optimization of a free-electron laser oscillator


Author(s): Kai Li, Minghao Song, and Haixiao Deng
A simplified one-dimensional theoretical model for free-electron laser oscillator (FELO) calculation which reserves the main physics is proposed. Instead of using traditional macroparticles sampling method, the theoretical model takes advantage of low gain theory to calculate the optical power singl...
[Phys. Rev. Accel. Beams 20, 030702] Published Tue Mar 07, 2017

Simulation of beam-induced plasma in gas-filled rf cavities


Author(s): Kwangmin Yu, Roman Samulyak, Katsuya Yonehara, and Ben Freemire
Processes occurring in a radio-frequency (rf) cavity, filled with high pressure gas and interacting with proton beams, have been studied via advanced numerical simulations. Simulations support the experimental program on the hydrogen gas-filled rf cavity in the Mucool Test Area (MTA) at Fermilab, an...
[Phys. Rev. Accel. Beams 20, 032002] Published Tue Mar 07, 2017

Role of thermal resistance on the performance of superconducting radio frequency cavities


Author(s): Pashupati Dhakal, Gianluigi Ciovati, and Ganapati Rao Myneni
Thermal stability is an important parameter for the operation of the superconducting radio frequency (SRF) cavities used in particle accelerators. The rf power dissipated on the inner surface of the cavities is conducted to the helium bath cooling the outer cavity surface and the equilibrium tempera...
[Phys. Rev. Accel. Beams 20, 032003] Published Tue Mar 07, 2017

Compact double-bunch x-ray free electron lasers for fresh bunch self-seeding and harmonic lasing


Author(s): C. Emma, Y. Feng, D. C. Nguyen, A. Ratti, and C. Pellegrini
This paper presents a novel method to improve the longitudinal coherence, efficiency and maximum photon energy of x-ray free electron lasers (XFELs). The method is equivalent to having two separate concatenated XFELs. The first uses one bunch of electrons to reach the saturation regime, generating a...
[Phys. Rev. Accel. Beams 20, 030701] Published Fri Mar 03, 2017

Field stabilization of Alvarez-type cavities


Author(s): X. Du, L. Groening, S. Mickat, A. Seibel, and O. K. Kester
Alvarez-type cavities are commonly used to reliably accelerate high quality hadron beams. Optimization of their longitudinal field homogeneity is usually accomplished by post-couplers, i.e., additional rods being integrated into the cavity. This paper instead proposes to use the stems that keep the ...
[Phys. Rev. Accel. Beams 20, 032001] Published Thu Mar 02, 2017

Spectral and spatial shaping of a laser-produced ion beam for radiation-biology experiments


Author(s): L. Pommarel, B. Vauzour, F. Mégnin-Chanet, E. Bayart, O. Delmas, F. Goudjil, C. Nauraye, V. Letellier, F. Pouzoulet, F. Schillaci, F. Romano, V. Scuderi, G. A. P. Cirrone, E. Deutsch, A. Flacco, and V. Malka
The study of radiation biology on laser-based accelerators is most interesting due to the unique irradiation conditions they can produce, in terms of peak current and duration of the irradiation. In this paper we present the implementation of a beam transport system to transport and shape the proton...
[Phys. Rev. Accel. Beams 20, 032801] Published Thu Mar 02, 2017

Development and operation of a Pr_{2}Fe_{14}B based cryogenic permanent magnet undulator for a high spatial resolution x-ray beam line


Author(s): C. Benabderrahmane, M. Valléau, A. Ghaith, P. Berteaud, L. Chapuis, F. Marteau, F. Briquez, O. Marcouillé, J.-L. Marlats, K. Tavakoli, A. Mary, D. Zerbib, A. Lestrade, M. Louvet, P. Brunelle, K. Medjoubi, C. Herbeaux, N. Béchu, P. Rommeluere, A. Somogyi, O. Chubar, C. Kitegi, and M.-E. Couprie
Short period, high field undulators are used to produce hard x-rays on synchrotron radiation based storage ring facilities of intermediate energy and enable short wavelength free electron laser. Cryogenic permanent magnet undulators take benefit from improved magnetic properties of RE_{2}Fe_{14}B (R...
[Phys. Rev. Accel. Beams 20, 033201] Published Thu Mar 02, 2017

Multiobjective optimization design of an rf gun based electron diffraction beam line


Author(s): Colwyn Gulliford, Adam Bartnik, Ivan Bazarov, and Jared Maxson
Multiobjective genetic algorithm optimizations of a single-shot ultrafast electron diffraction beam line comprised of a 100  MV/m 1.6-cell normal conducting rf (NCRF) gun, as well as a nine-cell 2π/3 bunching cavity placed between two solenoids, have been performed. These include optimization of the...
[Phys. Rev. Accel. Beams 20, 033401] Published Thu Mar 02, 2017

Simulating synchrotron radiation in accelerators including diffuse and specular reflections


Author(s): G. Dugan and D. Sagan

Accurate modeling of synchrotron-radiation photon flux inside the vacuum chamber is important for mitigating electron-cloud effects at future accelerators.

[Phys. Rev. Accel. Beams 20, 020708] Published Fri Feb 24, 2017

Experimental performance of an E×B chopper system


Author(s): C. Wiesner, M. Droba, O. Meusel, D. Noll, O. Payir, U. Ratzinger, and P. Schneider
Beam operation of a novel E×B chopper system has started in the low-energy beam transport (LEBT) section of the accelerator-driven neutron source FRANZ. The chopper is designed for low-energy high-perveance beams and high repetition rates, and will finally operate with 120 keV protons. It combines a...
[Phys. Rev. Accel. Beams 20, 020101] Published Wed Feb 22, 2017

Conditions for coherent-synchrotron-radiation-induced microbunching suppression in multibend beam transport or recirculation arcs


Author(s): C.-Y. Tsai, S. Di Mitri, D. Douglas, R. Li, and C. Tennant
The coherent synchrotron radiation (CSR) of a high-brightness electron beam traversing a series of dipoles, such as transport or recirculation arcs, may result in beam phase space degradation. On one hand, CSR can perturb electron transverse motion in dispersive regions along the beam line and possi...
[Phys. Rev. Accel. Beams 20, 024401] Published Wed Feb 22, 2017

Modeling power flow in the induction cavity with a two dimensional circuit simulation


Author(s): Fan Guo, Wenkang Zou, Boyi Gong, Jihao Jiang, Lin Chen, Meng Wang, and Weiping Xie
We have proposed a two dimensional (2D) circuit model of induction cavity. The oil elbow and azimuthal transmission line are modeled with one dimensional transmission line elements, while 2D transmission line elements are employed to represent the regions inward the azimuthal transmission line. The ...
[Phys. Rev. Accel. Beams 20, 020401] Published Tue Feb 21, 2017

Continuously tunable narrowband pulses in the THz gap from laser-modulated electron bunches in a storage ring


Author(s): P. Ungelenk, M. Höner, H. Huck, S. Khan, C. Mai, A. Meyer auf der Heide, C. Evain, C. Szwaj, and S. Bielawski
This article reports on the generation of narrowband coherent synchrotron radiation from an electron storage ring. For the first time, this kind of radiation was now produced with continuously tunable frequencies in the so-called “THz gap” (between 1.2 and 5.6 THz), whereas previous experiments were...
[Phys. Rev. Accel. Beams 20, 020706] Published Tue Feb 21, 2017

Normal planar undulators doubling as transverse gradient undulators


Author(s): Qika Jia and Heting Li

Sending the beam off center through a planar undulator allows lasing at larger energy spread, and may enable compact free electron lasers based on laser-plasma acceleration.

[Phys. Rev. Accel. Beams 20, 020707] Published Tue Feb 21, 2017

Electron lenses for head-on beam-beam compensation in RHIC


Author(s): X. Gu et al.
Two electron lenses (e-lenses) have been in operation during the 2015 RHIC physics run as part of a head-on beam-beam compensation scheme. While the RHIC lattice was chosen to reduce the beam-beam-induced resonance-driving terms, the electron lenses reduced the beam-beam-induced tune spread. This ha...
[Phys. Rev. Accel. Beams 20, 023501] Published Fri Feb 17, 2017