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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: 2016-12-09T11:14:18-05:00


rf breakdown measurements in electron beam driven 200 GHz copper and copper-silver accelerating structures


Author(s): Massimo Dal Forno, Valery Dolgashev, Gordon Bowden, Christine Clarke, Mark Hogan, Doug McCormick, Alexander Novokhatski, Brendan O’Shea, Bruno Spataro, Stephen Weathersby, and Sami G. Tantawi
This paper explores the physics of vacuum rf breakdowns in subterahertz high-gradient traveling-wave accelerating structures. We present the experimental results of rf tests of 200 GHz metallic accelerating structures, made of copper and copper-silver. These experiments were carried out at the Facil…
[Phys. Rev. Accel. Beams 19, 111301] Published Wed Nov 30, 2016

Characterization and long term operation of a novel superconducting undulator with 15 mm period length in a synchrotron light source


Author(s): S. Casalbuoni, A. Cecilia, S. Gerstl, N. Glamann, A. W. Grau, T. Holubek, C. Meuter, D. Saez de Jauregui, R. Voutta, C. Boffo, Th. Gerhard, M. Turenne, and W. Walter
A new cryogen-free full scale (1.5 m long) superconducting undulator with a period length of 15 mm (SCU15) has been successfully tested in the ANKA storage ring. This represents a very important milestone in the development of superconducting undulators for third and fourth generation light sources …
[Phys. Rev. Accel. Beams 19, 110702] Published Mon Nov 28, 2016

Analytical approach to chromatic correction in the final focus system of circular colliders


Author(s): Yunhai Cai
A conventional final focus system in particle accelerators is systematically analyzed. We find simple relations between the parameters of two focus modules in the final telescope. Using the relations, we derive the chromatic Courant-Snyder parameters for the telescope. The parameters are scaled appr…
[Phys. Rev. Accel. Beams 19, 111006] Published Mon Nov 28, 2016

Linear microbunching analysis for recirculation machines


Author(s): C.-Y. Tsai, D. Douglas, R. Li, and C. Tennant
Microbunching instability (MBI) has been one of the most challenging issues in designs of magnetic chicanes for short-wavelength free-electron lasers or linear colliders, as well as those of transport lines for recirculating or energy-recovery-linac machines. To quantify MBI for a recirculating mach…
[Phys. Rev. Accel. Beams 19, 114401] Published Mon Nov 28, 2016

Fast mapping of terahertz bursting thresholds and characteristics at synchrotron light sources


Author(s): Miriam Brosi, Johannes L. Steinmann, Edmund Blomley, Erik Bründermann, Michele Caselle, Nicole Hiller, Benjamin Kehrer, Yves-Laurent Mathis, Michael J. Nasse, Lorenzo Rota, Manuel Schedler, Patrik Schönfeldt, Marcel Schuh, Markus Schwarz, Marc Weber, and Anke-Susanne Müller

Bunch-by-bunch fast measurement of microbunching instability is done by detecting coherent THz radiation.

[Phys. Rev. Accel. Beams 19, 110701] Published Tue Nov 22, 2016

Off-axis beam dynamics in rf-gun-based electron photoinjectors


Author(s): R. Huang, C. Mitchell, C. Papadopoulos, H. Qian, M. Venturini, J. Qiang, D. Filippetto, J. Staples, Q. Jia, and F. Sannibale
The need to operate an rf-gun-based electron photoinjector with a beam emitted away from the cathode center can occur under various circumstances. First, in some cases the cathode can be affected by ion back-bombardment that progressively reduces the quantum efficiency (QE) in its center, making off…
[Phys. Rev. Accel. Beams 19, 113401] Published Tue Nov 22, 2016

Evaluation of the radiation field in the future circular collider detector


Author(s): M. I. Besana, F. Cerutti, A. Ferrari, W. Riegler, and V. Vlachoudis
The radiation load on a detector at a 100 TeV proton-proton collider, that is being investigated within the future circular collider (FCC) study, is presented. A first concept of the detector has been modeled and relevant fluence and dose distributions have been calculated using the fluka Monte Carl…
[Phys. Rev. Accel. Beams 19, 111004] Published Mon Nov 21, 2016

Design of beam optics for the future circular collider e^{+} e^{−} collider rings


Author(s): K. Oide et al.
A beam optics scheme has been designed for the future circular collider-e^{+}e^{−} (FCC-ee). The main characteristics of the design are: beam energy 45 to 175 GeV, 100 km circumference with two interaction points (IPs) per ring, horizontal crossing angle of 30 mrad at the IP and the crab-waist schem…
[Phys. Rev. Accel. Beams 19, 111005] Published Mon Nov 21, 2016

Erratum: Particle-in-cell simulation of x-ray wakefield acceleration and betatron radiation in nanotubes [Phys. Rev. Accel. Beams 19, 101004 (2016)]


Author(s): Xiaomei Zhang, Toshiki Tajima, Deano Farinella, Youngmin Shin, Gerard Mourou, Jonathan Wheeler, Peter Taborek, Pisin Chen, Franklin Dollar, and Baifei Shen
[Phys. Rev. Accel. Beams 19, 119902] Published Mon Nov 21, 2016

Niobium superconducting rf cavity fabrication by electrohydraulic forming


Author(s): E. Cantergiani, S. Atieh, F. Léaux, A. T. Perez Fontenla, S. Prunet, L. Dufay-Chanat, T. Koettig, F. Bertinelli, O. Capatina, G. Favre, F. Gerigk, A. C. Jeanson, J. Fuzeau, G. Avrillaud, D. Alleman, J. Bonafe, and P. Marty
Superconducting rf (SRF) cavities are traditionally fabricated from superconducting material sheets or made of copper coated with superconducting material, followed by trim machining and electron-beam welding. An alternative technique to traditional shaping methods, such as deep-drawing and spinning…
[Phys. Rev. Accel. Beams 19, 114703] Published Thu Nov 17, 2016

Iron-free detector magnet options for the future circular collider


Author(s): Matthias Mentink, Alexey Dudarev, Helder Filipe Pais Da Silva, Gabriella Rolando, Benoit Cure, Andrea Gaddi, Vyacheslav Klyukhin, Hubert Gerwig, Udo Wagner, and Herman ten Kate
In this paper, several iron-free solenoid-based designs of a detector magnet for the future circular collider for hadron-hadron collisions (FCC-hh) are presented. The detector magnet designs for FCC-hh aim to provide bending power for particles over a wide pseudorapidity range (0≤|η|≤4). To achieve …
[Phys. Rev. Accel. Beams 19, 111001] Published Wed Nov 16, 2016

Radiation damage and thermal shock response of carbon-fiber-reinforced materials to intense high-energy proton beams


Author(s): N. Simos, Z. Zhong, S. Ghose, H. G. Kirk, L-P Trung, K. T. McDonald, Z. Kotsina, P. Nocera, R. Assmann, S. Redaelli, A. Bertarelli, E. Quaranta, A. Rossi, R. Zwaska, K. Ammigan, P. Hurh, and N. Mokhov
A comprehensive study on the effects of energetic protons on carbon-fiber composites and compounds under consideration for use as low-Z pion production targets in future high-power accelerators and low-impedance collimating elements for intercepting TeV-level protons at the Large Hadron Collider has…
[Phys. Rev. Accel. Beams 19, 111002] Published Wed Nov 16, 2016

Design and optimization of Compact Linear Collider main linac accelerating structure


Author(s): Hao Zha and Alexej Grudiev
The Compact Linear Collider (CLIC) main linac uses waveguide damped structure as its baseline design. The current baseline structure design written in the CLIC Conceptual Design Report is named “CLIC-G.” Recent activities on the CLIC-G design including high power tests on structure prototypes and th…
[Phys. Rev. Accel. Beams 19, 111003] Published Wed Nov 16, 2016

Dynamics of electron injection and acceleration driven by laser wakefield in tailored density profiles


Author(s): P. Lee, G. Maynard, T. L. Audet, B. Cros, R. Lehe, and J.-L. Vay
The dynamics of electron acceleration driven by laser wakefield is studied in detail using the particle-in-cell code WARP with the objective to generate high-quality electron bunches with narrow energy spread and small emittance, relevant for the electron injector of a multistage accelerator. Simula…
[Phys. Rev. Accel. Beams 19, 112802] Published Wed Nov 16, 2016

Narrow-band photon beam via laser Compton scattering in an energy recovery linac


Author(s): T. Akagi, A. Kosuge, S. Araki, R. Hajima, Y. Honda, T. Miyajima, M. Mori, R. Nagai, N. Nakamura, M. Shimada, T. Shizuma, N. Terunuma, and J. Urakawa

The first experimental demonstration of Compton (Thomson) radiation with an energy recovery linac in combination with a laser enhancement cavity.

[Phys. Rev. Accel. Beams 19, 114701] Published Tue Nov 15, 2016

Influence of the electron beam emittance on the polarization of a laser-electron x-ray generator


Author(s): R. M. Feshchenko, A. V. Vinogradov, and I. A. Artyukov
In this paper we analyze the polarization of the x-ray radiation coming from laser-electron x-ray generator (LEXG). We obtain general relations connecting the polarization state of outgoing x-ray radiation to the polarization state of laser beam as well as to the parameters of electron beam. We demo…
[Phys. Rev. Accel. Beams 19, 114702] Published Mon Nov 14, 2016

Publisher’s Note: Experimental measurements and theoretical model of the cryogenic performance of bialkali photocathode and characterization with Monte Carlo simulation [Phys. Rev. Accel. Beams 19, 103401 (2016)]


Author(s): Huamu Xie, Ilan Ben-Zvi, Triveni Rao, Tianmu Xin, and Erdong Wang
[Phys. Rev. Accel. Beams 19, 119901] Published Mon Nov 14, 2016

Formation region effects in transition radiation, bremsstrahlung, and ionization loss of ultrarelativistic electrons


Author(s): S. V. Trofymenko and N. F. Shul’ga
The processes of transition radiation and bremsstrahlung by an ultrarelativistic electron as well as the effect of transition radiation influence upon the electron ionization loss in thin layer of substance are theoretically investigated in the case when radiation formation region has macroscopicall…
[Phys. Rev. Accel. Beams 19, 112801] Published Thu Nov 03, 2016

Efficient twin aperture magnets for the future circular e^{+} /e^{_} collider


Author(s): A. Milanese
We report preliminary designs for the arc dipoles and quadrupoles of the FCC-ee double-ring collider. After recalling cross sections and parameters of warm magnets used in previous large accelerators, we focus on twin aperture layouts, with a magnetic coupling between the gaps, which minimizes const…
[Phys. Rev. Accel. Beams 19, 112401] Published Wed Nov 02, 2016

Double stop-band structure near half-integer tunes in high-intensity rings


Author(s): K. Moriya, M. Ota, K. Fukushima, M. Yamaguchi, K. Ito, and H. Okamoto

Experiments at a table-top ion trap reveal space-charge driven coherent betatron resonances which will occur in high-intensity storage rings.

[Phys. Rev. Accel. Beams 19, 114201] Published Wed Nov 02, 2016

Beam shaping to improve the free-electron laser performance at the Linac Coherent Light Source


Author(s): Y. Ding, K. L. F. Bane, W. Colocho, F.-J. Decker, P. Emma, J. Frisch, M. W. Guetg, Z. Huang, R. Iverson, J. Krzywinski, H. Loos, A. Lutman, T. J. Maxwell, H.-D. Nuhn, D. Ratner, J. Turner, J. Welch, and F. Zhou
A new operating mode has been developed for the Linac Coherent Light Source (LCLS) in which we shape the longitudinal phase space of the electron beam. This mode of operation is realized using a horizontal collimator located in the middle of the first bunch compressor to truncate the head and tail o…
[Phys. Rev. Accel. Beams 19, 100703] Published Thu Oct 27, 2016

Volume reflection angle study as a function of crystal curvature


Author(s): V. M. Biryukov
We compare the volume reflection angles measured for protons and electrons over a wide energy range from 1 to 400 GeV in Si and Ge bent crystals at PNPI, IHEP, SLAC, and CERN with the predictions of FLUX and CATCH simulation codes based on binary collisions (FLUX) and continuum model (CATCH). We sho…
[Phys. Rev. Accel. Beams 19, 101006] Published Thu Oct 27, 2016

Caustic-based approach to understanding bunching dynamics and current spike formation in particle bunches


Author(s): T. K. Charles, D. M. Paganin, and R. T. Dowd
Current modulations, current spikes, and current horns, are observed in a range of accelerator physics applications including strong bunch compression in Free Electron Lasers and linear colliders, trains of microbunching for terahertz radiation, microbunching instability and many others. This paper …
[Phys. Rev. Accel. Beams 19, 104402] Published Thu Oct 27, 2016

Commissioning experience and beam physics measurements at the SwissFEL Injector Test Facility


Author(s): T. Schietinger et al.

This paper describes their facility and its operating parameters, the results of commissioning, and demonstration of innovative diagnostics.

[Phys. Rev. Accel. Beams 19, 100702] Published Wed Oct 26, 2016

Extreme regimes of femtosecond photoemission from a copper cathode in a dc electron gun


Author(s): P. L. E. M. Pasmans, D. C. van Vugt, J. P. van Lieshout, G. J. H. Brussaard, and O. J. Luiten
The femtosecond photoemission yield from a copper cathode and the emittance of the created electron beams has been studied in a 12  MeV/m, 100 keV dc electron gun over a wide range of laser fluence, from the linear photoemission regime until the onset of image charge limitations and cathode damaging…
[Phys. Rev. Accel. Beams 19, 103403] Published Wed Oct 26, 2016

Enhanced dynamical stability with harmonic slip stacking


Author(s): Jeffrey Eldred and Robert Zwaska
We develop a configuration of radio-frequency (rf) cavities to dramatically improve the performance of slip stacking. Slip stacking is an accumulation technique used at Fermilab to nearly double proton intensity by maintaining two beams of different momenta in the same storage ring. The two particle…
[Phys. Rev. Accel. Beams 19, 104001] Published Wed Oct 26, 2016

Limitation on the accelerating gradient of a wakefield excited by an ultrarelativistic electron beam in rubidium plasma


Author(s): N. Vafaei-Najafabadi, K. A. Marsh, C. E. Clayton, W. An, W. B. Mori, C. Joshi, W. Lu, E. Adli, S. Corde, C. I. Clarke, M. Litos, S. Z. Green, S. Gessner, J. Frederico, A. S. Fisher, Z. Wu, D. Walz, and M. J. Hogan
We have investigated the viability of using plasmas formed by ionization of high Z, low ionization potential element rubidium (Rb) for beam-driven plasma wakefield acceleration. The Rb vapor column confined by argon (Ar) buffer gas was used to reduce the expected limitation on the beam propagation l…
[Phys. Rev. Accel. Beams 19, 101303] Published Tue Oct 25, 2016

Systematical study on superconducting radio frequency elliptic cavity shapes applicable to future high energy accelerators and energy recovery linacs


Author(s): Valery Shemelin, Shahnam Gorgi Zadeh, Johann Heller, and Ursula van Rienen
Elliptic cavities at medium- and high-β range are receiving broader use in the particle accelerator applications. Optimizing the shape of these cavities is a complex and demanding process. In this paper we propose an optimization approach to minimize the ratio of peak magnetic field to the accelerat…
[Phys. Rev. Accel. Beams 19, 102002] Published Tue Oct 25, 2016

Low-frequency quadrupole impedance of undulators and wigglers


Author(s): A. Blednykh, G. Bassi, Y. Hidaka, V. Smaluk, and G. Stupakov
An analytical expression of the low-frequency quadrupole impedance for undulators and wigglers is derived and benchmarked against beam-based impedance measurements done at the 3 GeV NSLS-II storage ring. The adopted theoretical model, valid for an arbitrary number of electromagnetic layers with para…
[Phys. Rev. Accel. Beams 19, 104401] Published Tue Oct 25, 2016

Investigation of beam self-polarization in the future e^{+} e^{−} circular collider


Author(s): E. Gianfelice-Wendt
The use of resonant depolarization has been suggested for precise beam energy measurements (better than 100 keV) in the e^{+}e^{−} Future Circular Collider (FCC-e^{+}e^{−}) for Z and WW physics at 45 and 80 GeV beam energy respectively. Longitudinal beam polarization would benefit the Z peak physics…
[Phys. Rev. Accel. Beams 19, 101005] Published Mon Oct 24, 2016

Effects of ion bombardment on bulk GaAs photocathodes with different surface-cleavage planes


Author(s): Wei Liu, Shukui Zhang, Marcy Stutzman, and Matt Poelker

Photocathodes with (110) cleave plane are shown to be the least susceptible to ion damage. The observed susceptibility is explained by enhanced ion channeling.

[Phys. Rev. Accel. Beams 19, 103402] Published Mon Oct 24, 2016

Experimental measurements and theoretical model of the cryogenic performance of bialkali photocathode and characterization with Monte Carlo simulation


Author(s): Huamu Xie, Ilan Ben-Zvi, Triveni Rao, Tianmu Xin, and Erdong Wang
High-average-current, high-brightness electron sources have important applications, such as in high-repetition-rate free-electron lasers, or in the electron cooling of hadrons. Bialkali photocathodes are promising high-quantum-efficiency (QE) cathode materials, while superconducting rf (SRF) electro…
[Phys. Rev. Accel. Beams 19, 103401] Published Wed Oct 19, 2016

Particle-in-cell simulation of x-ray wakefield acceleration and betatron radiation in nanotubes


Author(s): Xiaomei Zhang, Toshiki Tajima, Deano Farinella, Youngmin Shin, Gerard Mourou, Jonathan Wheeler, Peter Taborek, Pisin Chen, Franklin Dollar, and Baifei Shen
Though wakefield acceleration in crystal channels has been previously proposed, x-ray wakefield acceleration has only recently become a realistic possibility since the invention of the single-cycled optical laser compression technique. We investigate the acceleration due to a wakefield induced by a …
[Phys. Rev. Accel. Beams 19, 101004] Published Tue Oct 18, 2016

Long term dynamics of the high luminosity Large Hadron Collider with crab cavities


Author(s): J. Barranco García, R. De Maria, A. Grudiev, R. Tomás García, R. B. Appleby, and D. R. Brett
The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) aims to achieve an integrated luminosity of 200–300  fb^{−1} per year, including the contribution from the upgrade of the injector chain. For the HL-LHC the larger crossing angle together with a smaller beta function at the collision …
[Phys. Rev. Accel. Beams 19, 101003] Published Tue Oct 11, 2016

Polarization response of RHIC electron lens lattices


Author(s): V. H. Ranjbar, F. Méot, M. Bai, D. T. Abell, and D. Meiser
Depolarization response for a system of two orthogonal snakes at irrational tunes is studied in depth using lattice independent spin integration. In particular we consider the effect of overlapping spin resonances in this system, to understand the impact of phase, tune, relative location and thresho…
[Phys. Rev. Accel. Beams 19, 101002] Published Mon Oct 10, 2016

Tunable THz radiation source from dielectric loaded waveguide excited by nonrelativistic electron bunch trains


Author(s): Weiwei Li, Zhigang He, Yalin Lu, Ruixuan Huang, Weihao Liu, Qika Jia, and Lin Wang
We propose a novel scheme to generate a tunable narrow-band THz radiation. In this scheme, a train of laser pulses with THz repetition rate is used to drive a photocathode direct current (DC) gun, leading to the emission of a train of electron bunches. The electron bunch train is subsequently accele…
[Phys. Rev. Accel. Beams 19, 104701] Published Thu Oct 06, 2016

Probing half β_{y}^{*} optics in the Accelerator Test Facility 2


Author(s): M. Patecki, D. Bett, E. Marin, F. Plassard, R. Tomás, K. Kubo, S. Kuroda, T. Naito, T. Okugi, T. Tauchi, and N. Terunuma
A nanometer beam size at the interaction point (IP) is required for future linear colliders to achieve the desired rate of particle collisions. KEK Accelerator Test Facility 2 (ATF2), a scaled down implementation of the linear collider beam delivery system, serves for demonstrating the feasibility o…
[Phys. Rev. Accel. Beams 19, 101001] Published Wed Oct 05, 2016

Wake excited in plasma by an ultrarelativistic pointlike bunch


Author(s): G. Stupakov, B. Breizman, V. Khudik, and G. Shvets
We study propagation of a relativistic electron bunch through a cold plasma assuming that the transverse and longitudinal dimensions of the bunch are much smaller than the plasma collisionless skin depth. Treating the bunch as a point charge and assuming that its charge is small, we derive a simplif…
[Phys. Rev. Accel. Beams 19, 101302] Published Wed Oct 05, 2016

Breakdown study based on direct in situ observation of inner surfaces of an rf accelerating cavity during a high-gradient test


Author(s): Tetsuo Abe, Tatsuya Kageyama, Hiroshi Sakai, Yasunao Takeuchi, and Kazuo Yoshino
We have developed normal-conducting accelerating single-cell cavities with a complete higher-order-mode (HOM) heavily damped structure, into which we feed a 508.9-MHz continuous wave. During a high-gradient test of the second production version of the cavity, we performed a breakdown study based on …
[Phys. Rev. Accel. Beams 19, 102001] Published Tue Oct 04, 2016

Transverse to longitudinal phase space coupling in an electron beam for suppression of microbunching instability


Author(s): Dazhang Huang, Chao Feng, Haixiao Deng, Qiang Gu, and Zhentang Zhao
The microbunching instability developed during the beam compression process in the linear accelerator (LINAC) of a free-electron laser (FEL) facility has always been a problem that degrades the lasing performance, and even no FEL is able to be produced if the beam quality is destroyed too much by th…
[Phys. Rev. Accel. Beams 19, 100701] Published Mon Oct 03, 2016

Electron acceleration and generation of high-brilliance x-ray radiation in kilojoule, subpicosecond laser-plasma interactions


Author(s): J. Ferri, X. Davoine, S. Y. Kalmykov, and A. Lifschitz

Comparison through particle-in-cell simulations of self-modulated-high-density and resonant-low-density regimes provides a bridge between the laser-wakefield-acceleration and picosecond-petawatt-laser communities.

[Phys. Rev. Accel. Beams 19, 101301] Published Mon Oct 03, 2016

Efficient computation of coherent synchrotron radiation in a rectangular chamber


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


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


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


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


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


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


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


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


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


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


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.

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

Mid-infrared lasers for energy frontier plasma accelerators


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.

[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


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


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


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.

[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


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.

[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


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”


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’”


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


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


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


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


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


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


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

More realistic laser beams affect spectral properties of Thomson scattering.

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

High power experimental studies of hybrid photonic band gap accelerator structures


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}


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


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


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


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


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


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


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


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


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


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.

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

Common operation metrics for storage ring light sources


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


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


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


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


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


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


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


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


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


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


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


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


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


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

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

[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


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


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.

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

Beam induced electron cloud resonances in dipole magnetic fields


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)]


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


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


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


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


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


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