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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: 2017-04-28T16:50:43-04:00


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

C-band disk-loaded-type accelerating structure for a high acceleration gradient and high-repetition-rate operation


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

Compression of a photoinjector electron bunch in the negative-mass undulator


Author(s): Ilya V. Bandurkin, Ilya S. Kurakin, and Andrey V. Savilov

An electron bunch is compressed in the THz region using a negative mass undulator against Coulomb repulsion.

[Phys. Rev. Accel. Beams 20, 020704] Published Wed Feb 15, 2017

First operation of a harmonic lasing self-seeded free electron laser


Author(s): E. A. Schneidmiller, B. Faatz, M. Kuhlmann, J. Rönsch-Schulenburg, S. Schreiber, M. Tischer, and M. V. Yurkov

First experimental observation of harmonic lasing self-seeded free electron laser demonstrates shorter saturation length, narrower bandwidth, and improved taper efficiency.

[Phys. Rev. Accel. Beams 20, 020705] Published Wed Feb 15, 2017

Monochromaticity of coherent Smith-Purcell radiation from finite size grating


Author(s): A. Aryshev, A. Potylitsyn, G. Naumenko, M. Shevelev, K. Lekomtsev, L. Sukhikh, P. Karataev, Y. Honda, N. Terunuma, and J. Urakawa
Investigation of coherent Smith-Purcell radiation (SPR) spectral characteristics was performed both experimentally and by numerical simulation. The measurement of SPR spectral line shapes of different diffraction orders was carried out at the KEK LUCX facility. A pair of room-temperature Schottky ba…
[Phys. Rev. Accel. Beams 20, 024701] Published Mon Feb 13, 2017

Depth-of-field effects in wiggler radiation sources: Geometrical versus wave optics


Author(s): Richard P. Walker
A detailed analysis is carried out of the optical properties of synchrotron radiation emitted by multipole wigglers, concentrating on the effective source size and brightness and the so-called “depth of field” effects, concerning which there has been some controversy in the literature. By comparing …
[Phys. Rev. Accel. Beams 20, 020703] Published Wed Feb 08, 2017

Phase matching strategy for the undulator system in the European X-ray Free Electron Laser


Author(s): Yuhui Li and Joachim Pflueger
The undulator system in the European X-ray Free Electron Laser is mainly comprised of 5-m long undulator segments and 1.1 m long intersections in between. The longitudinal component of the electrons’ velocity is reduced when traveling inside an undulator due to the wiggle motion. Therefore the optic…
[Phys. Rev. Accel. Beams 20, 020702] Published Mon Feb 06, 2017

Editorial: From the APS Editor in Chief


Author(s): Pierre Meystre
[Phys. Rev. Accel. Beams 20, 020001] Published Fri Feb 03, 2017

Compact beam transport system for free-electron lasers driven by a laser plasma accelerator


Author(s): Tao Liu, Tong Zhang, Dong Wang, and Zhirong Huang
Utilizing laser-driven plasma accelerators (LPAs) as a high-quality electron beam source is a promising approach to significantly downsize the x-ray free-electron laser (XFEL) facility. A multi-GeV LPA beam can be generated in several-centimeter acceleration distance, with a high peak current and a …
[Phys. Rev. Accel. Beams 20, 020701] Published Wed Feb 01, 2017

New target solution for a muon collider or a muon-decay neutrino beam facility: The granular waterfall target


Author(s): Han-Jie Cai, Guanghui Yang, Nikos Vassilopoulos, Sheng Zhang, Fen Fu, Ye Yuan, and Lei Yang
A new target solution, the granular waterfall target, is proposed here for a muon collider or a muon-decay neutrino beam facility, especially for the moment which adopts a 15 MW continuous-wave (cw) superconducting linac. Compared to the mercury jet target, the granular waterfall target works by a m…
[Phys. Rev. Accel. Beams 20, 023401] Published Wed Feb 01, 2017

Machine detector interface studies: Layout and synchrotron radiation estimate in the future circular collider interaction region


Author(s): Manuela Boscolo, Helmut Burkhardt, and Michael Sullivan
The interaction region layout for the e^{+}e^{−} future circular collider FCC-ee is presented together with a preliminary estimate of synchrotron radiation that affects this region. We describe in this paper the main guidelines of this design and the estimate of synchrotron radiation coming from the…
[Phys. Rev. Accel. Beams 20, 011008] Published Fri Jan 27, 2017

Numerical simulations of gas mixing effect in electron cyclotron resonance ion sources


Author(s): V. Mironov, S. Bogomolov, A. Bondarchenko, A. Efremov, and V. Loginov
The particle-in-cell Monte Carlo collisions code nam-ecris is used to simulate the electron cyclotron resonance ion source (ECRIS) plasma sustained in a mixture of Kr with O_{2}, N_{2}, Ar, Ne, and He. The model assumes that ions are electrostatically confined in the ECR zone by a dip in the plasma …
[Phys. Rev. Accel. Beams 20, 013402] Published Thu Jan 26, 2017

Statistics of vacuum breakdown in the high-gradient and low-rate regime


Author(s): Walter Wuensch, Alberto Degiovanni, Sergio Calatroni, Anders Korsbäck, Flyura Djurabekova, Robin Rajamäki, and Jorge Giner-Navarro
In an increasing number of high-gradient linear accelerator applications, accelerating structures must operate with both high surface electric fields and low breakdown rates. Understanding the statistical properties of breakdown occurrence in such a regime is of practical importance for optimizing a…
[Phys. Rev. Accel. Beams 20, 011007] Published Wed Jan 25, 2017

Experimental study of current loss and plasma formation in the Z machine post-hole convolute


Author(s): M. R. Gomez, R. M. Gilgenbach, M. E. Cuneo, C. A. Jennings, R. D. McBride, E. M. Waisman, B. T. Hutsel, W. A. Stygar, D. V. Rose, and Y. Maron

Spectroscopic measurements of plasma density, temperature, and plasma closure velocities are preparing the path to scaled-up pulsed power drivers for future research.

[Phys. Rev. Accel. Beams 20, 010401] Published Tue Jan 24, 2017

On-line dispersion estimation and correction scheme for the Compact Linear Collider


Author(s): J. Pfingstner, E. Adli, and D. Schulte
The Compact Linear Collider (CLIC) has stringent component alignment tolerances in order to preserve the ultralow emittance of the utilized particle beams. Beam-based alignment techniques have been designed to relax these tolerances to realizable values. In this paper, a scheme is presented that is …
[Phys. Rev. Accel. Beams 20, 011006] Published Tue Jan 24, 2017

Generating high-brightness and coherent soft x-ray pulses in the water window with a seeded free-electron laser


Author(s): Kaishang Zhou, Chao Feng, Haixiao Deng, and Dong Wang
We propose a new scheme to generate high-brightness and temporal coherent soft x-ray radiation in a seeded free-electron laser. The proposed scheme is based on the coherent harmonic generation (CHG) and superradiant principles. A CHG scheme is first used to generate a coherent signal at ultrahigh ha…
[Phys. Rev. Accel. Beams 20, 010702] Published Mon Jan 23, 2017

Symplectic multiparticle tracking model for self-consistent space-charge simulation


Author(s): Ji Qiang
Symplectic tracking is important in accelerator beam dynamics simulation. So far, to the best of our knowledge, there is no self-consistent symplectic space-charge tracking model available in the accelerator community. In this paper, we present a two-dimensional and a three-dimensional symplectic mu…
[Phys. Rev. Accel. Beams 20, 014203] Published Mon Jan 23, 2017

Vertically polarizing undulator with dynamic compensation of magnetic forces


Author(s): N. Strelnikov, I. Vasserman, J. Xu, D. Jensen, O. Schmidt, E. Trakhtenberg, K. Suthar, E. R. Moog, G. Pile, and E. Gluskin
As part of the R program of the LCLS-II project, a novel 3.4-meter-long undulator prototype with horizontal magnetic field and dynamic force compensation has recently been developed at the Advanced Photon Source (APS). Previous steps in this development were the shorter 0.8-meter-long and 2.8-meter-…
[Phys. Rev. Accel. Beams 20, 010701] Published Fri Jan 20, 2017

Accuracy and feasibility of the β^{*} measurement for LHC and High Luminosity LHC using k modulation


Author(s): F. Carlier and R. Tomás
The future regimes of operation of the LHC will require improved control of β^{*} measurements to successfully level the luminosities in the interaction points. The method of k modulation has been widely used in other machines to measure lattice beta functions. In the LHC, k modulation of the closes…
[Phys. Rev. Accel. Beams 20, 011005] Published Fri Jan 20, 2017

Fundamental cavity impedance and longitudinal coupled-bunch instabilities at the High Luminosity Large Hadron Collider


Author(s): P. Baudrenghien and T. Mastoridis
The interaction between beam dynamics and the radio frequency (rf) station in circular colliders is complex and can lead to longitudinal coupled-bunch instabilities at high beam currents. The excitation of the cavity higher order modes is traditionally damped using passive devices. But the wakefield…
[Phys. Rev. Accel. Beams 20, 011004] Published Thu Jan 19, 2017

Trace-space reconstruction of low-emittance electron beams through betatron radiation in laser-plasma accelerators


Author(s): A. Curcio, M. Anania, F. Bisesto, E. Chiadroni, A. Cianchi, M. Ferrario, F. Filippi, D. Giulietti, A. Marocchino, M. Petrarca, V. Shpakov, and A. Zigler
A new methodology able to model and reconstruct the transverse trace space of low-emittance electron beams accelerated in the bubble regime of laser-plasma interaction is presented. The single-shot measurement of both the electron energy spectrum and the betatron radiation spectrum is shown to allow…
[Phys. Rev. Accel. Beams 20, 012801] Published Tue Jan 17, 2017

Impedance simulations and measurements on the LHC collimators with embedded beam position monitors


Author(s): N. Biancacci, F. Caspers, J. Kuczerowski, E. Métral, N. Mounet, B. Salvant, A. Mostacci, O. Frasciello, and M. Zobov
The LHC collimation system is a critical element for the safe operation of the LHC machine. The necessity of fast accurate positioning of the collimator’s jaws, recently introduced the need to have button beam position monitors directly embedded in the jaws extremities of the LHC tertiary collimator…
[Phys. Rev. Accel. Beams 20, 011003] Published Thu Jan 12, 2017

Electromagnetic characterization of nonevaporable getter properties between 220–330 and 500–750 GHz for the Compact Linear Collider damping rings


Author(s): E. Koukovini-Platia, G. Rumolo, and C. Zannini
Due to its effective pumping ability, nonevaporable getter (NEG) coating is considered for the vacuum chambers of the Compact Linear Collider (CLIC) electron damping rings (EDR). The aim is to suppress fast beam ion instabilities. The electromagnetic (EM) characterization of the NEG properties up to…
[Phys. Rev. Accel. Beams 20, 011002] Published Wed Jan 11, 2017

Emittance compensation in split photoinjectors


Author(s): Klaus Floettmann

An alternative approach to emittance compensation presenting a better understanding of the injector optimization.

[Phys. Rev. Accel. Beams 20, 013401] Published Wed Jan 11, 2017

Parametric instabilities in 3D periodically focused beams with space charge


Author(s): Ingo Hofmann and Oliver Boine-Frankenheim
Parametric resonances of beam eigenmodes with a periodic focusing system under the effect of space charge—also called structural instabilities—are the collective counterparts to parametric resonances of single particles or of mechanical systems. Their common feature is that an exponential instabilit…
[Phys. Rev. Accel. Beams 20, 014202] Published Wed Jan 11, 2017

Diffusion measurement from observed transverse beam echoes


Author(s): Tanaji Sen and Wolfram Fischer
We study the measurement of transverse diffusion through beam echoes. We revisit earlier observations of echoes in the Relativistic Heavy Ion Collider and apply an updated theoretical model to these measurements. We consider three possible models for the diffusion coefficient and show that only one …
[Phys. Rev. Accel. Beams 20, 011001] Published Mon Jan 09, 2017

Design and testing of a four rod crab cavity for High Luminosity LHC


Author(s): B. Hall, G. Burt, R. Apsimon, C. J. Lingwood, A. Tutte, A. Grudiev, A. Macpherson, M. Navarro-Tapia, R. Calaga, K. G. Hernández-Chahín, R. B. Appleby, and P. Goudket
A 4-rod deflecting structure is proposed as a possible crab cavity design for the LHC high luminosity upgrade. Crab cavities are required for the LHC luminosity upgrade to provide a greater bunch overlap in the presence of a crossing angle, but must fit in the existing limited space. The structure h…
[Phys. Rev. Accel. Beams 20, 012001] Published Tue Jan 03, 2017

Operational performance of the CERN injector complex with transversely split beams


Author(s): S. Abernethy, A. Akroh, H. Bartosik, A. Blas, T. Bohl, S. Cettour-Cave, K. Cornelis, H. Damerau, S. Gilardoni, M. Giovannozzi, C. Hernalsteens, A. Huschauer, V. Kain, D. Manglunki, G. Métral, B. Mikulec, B. Salvant, J.-L. Sanchez Alvarez, R. Steerenberg, G. Sterbini, and Y. Wu

Multiturn extraction scheme is now used in standard operation for manipulating high-intensity proton beams at the CERN Proton Synchrotron.

[Phys. Rev. Accel. Beams 20, 014001] Published Tue Jan 03, 2017

Higher order mode beams mitigate halos in high intensity proton linacs


Author(s): Abhishek Pathak and Srinivas Krishnagopal
High intensity proton linacs (HIPLs) for applications such as Accelerator Driven Reactor Systems (ADRS) have serious beam dynamics issues related to beam halo formation. This can lead to particle loss and radioactivation of the surroundings which consequently limit the beam current. Beam halos are l…
[Phys. Rev. Accel. Beams 20, 014201] Published Tue Jan 03, 2017

Fokker-Planck analysis of transverse collective instabilities in electron storage rings


Author(s): Ryan R. Lindberg
We analyze single bunch transverse instabilities due to wakefields using a Fokker-Planck model. We first expand on the work of T. Suzuki, Part. Accel. 12, 237 (1982) to derive the theoretical model including chromaticity, both dipolar and quadrupolar transverse wakefields, and the effects of damping…
[Phys. Rev. Accel. Beams 19, 124402] Published Fri Dec 30, 2016

Multiple harmonic frequencies resonant cavity design and half-scale prototype measurements for a fast kicker


Author(s): Yulu Huang, Haipeng Wang, Robert A. Rimmer, Shaoheng Wang, and Jiquan Guo

A multiple harmonic deflecting cavity for use as a fast kicker has been designed and a prototype demonstrated.

[Phys. Rev. Accel. Beams 19, 122001] Published Thu Dec 29, 2016

Laser-driven ion accelerators for tumor therapy revisited


Author(s): Ute Linz and Jose Alonso
Ten years ago, the authors of this report published a first paper on the technical challenges that laser accelerators need to overcome before they could be applied to tumor therapy. Among the major issues were the maximum energy of the accelerated ions and their intensity, control and reproducibilit…
[Phys. Rev. Accel. Beams 19, 124802] Published Thu Dec 29, 2016

Final focus designs for crab waist colliders


Author(s): A. Bogomyagkov, E. Levichev, and P. Piminov
The crab waist collision scheme promises significant luminosity gain. The successful upgrade of the DAΦNE collider proved the principle of crab waist collision and increased luminosity 3 times. Therefore, several new projects try to implement the scheme. The paper reviews interaction region designs …
[Phys. Rev. Accel. Beams 19, 121005] Published Wed Dec 28, 2016

CERN Proton Synchrotron booster space charge simulations with a realistic model for alignment and field errorsn1


Author(s): V. Forte, E. Benedetto, and M. McAteer
The CERN Proton Synchrotron booster (PSB) is one of the machines of the LHC injector chain which will be upgraded within the LHC Injectors Upgrade (LIU) project. The injection energy of the PSB will be increased to 160 MeV in order to mitigate direct space charge effects, considered to be the main p…
[Phys. Rev. Accel. Beams 19, 124202] Published Wed Dec 28, 2016

Continuous wave superconducting radio frequency electron linac for nuclear physics research


Author(s): Charles E. Reece
CEBAF, the Continuous Electron Beam Accelerator Facility, has been actively serving the nuclear physics research community as a unique forefront international resource since 1995. This cw electron linear accelerator (linac) at the U.S. Department of Energy’s Thomas Jefferson National Accelerator Fac…
[Phys. Rev. Accel. Beams 19, 124801] Published Wed Dec 28, 2016

Beam commissioning for a superconducting proton linac


Author(s): Zhi-Jun Wang, Yuan He, Huan Jia, Wei-ping Dou, Wei-long Chen, X. L. Zhang, Shu-hui Liu, Chi Feng, Yue Tao, Wang-sheng Wang, Jian-qiang Wu, Sheng-hu Zhang, and Hong-Wei Zhao
To develop the next generation of safe and cleaner nuclear energy, the accelerator-driven subcritical (ADS) system emerges as one of the most attractive technologies. It will be able to transmute the long-lived transuranic radionuclides produced in the reactors of today’s nuclear power plants into s…
[Phys. Rev. Accel. Beams 19, 120101] Published Tue Dec 27, 2016

Availability modeling approach for future circular colliders based on the LHC operation experience


Author(s): Arto Niemi, Andrea Apollonio, Johannes Gutleber, Peter Sollander, Jussi-Pekka Penttinen, and Seppo Virtanen
Reaching the challenging integrated luminosity production goals of a future circular hadron collider (FCC-hh) and high luminosity LHC (HL-LHC) requires a thorough understanding of today’s most powerful high energy physics research infrastructure, the LHC accelerator complex at CERN. FCC-hh, a 4 time…
[Phys. Rev. Accel. Beams 19, 121003] Published Tue Dec 27, 2016

Volume reflection and channeling of ultrarelativistic protons in germanium bent single crystals


Author(s): S. Bellucci and V. A. Maisheev
The paper is devoted to the investigation of volume reflection and channeling processes of ultrarelativistic positive charged particles moving in germanium single crystals. We demonstrate that the choice of atomic potential on the basis of the Hartree-Fock method and the correct choice of the Debye …
[Phys. Rev. Accel. Beams 19, 121004] Published Tue Dec 27, 2016

Transverse beam profile reconstruction using synchrotron radiation interferometry


Author(s): L. Torino and U. Iriso
Transverse beam size measurements in new generation of synchrotron light sources is a challenging task due to their characteristic small beam emittances and low couplings. Since the late 1990s, synchrotron radiation interferometry (SRI) has been used in many accelerators to measure the beam size thr…
[Phys. Rev. Accel. Beams 19, 122801] Published Tue Dec 27, 2016

Early transverse decoherence of bunches with space charge


Author(s): Ivan Karpov, Vladimir Kornilov, and Oliver Boine-Frankenheim

An analytical model, particle tracking simulations, and beam measurements all reveal how space-charge forces counteract the beam decoherence.

[Phys. Rev. Accel. Beams 19, 124201] Published Tue Dec 27, 2016

Longitudinal transport measurements in an energy recovery accelerator with triple bend achromat arcs


Author(s): F. Jackson, D. Angal-Kalinin, Y. M. Saveliev, P. H. Williams, and A. Wolski
Longitudinal properties of electron bunches (energy spread and bunch length) and their manipulation are of importance in free electron lasers (FELs), where magnetic bunch length compression is a common feature of beam transport. Recirculating accelerators and energy recovery linac accelerators (ERLs…
[Phys. Rev. Accel. Beams 19, 120701] Published Fri Dec 23, 2016

Hybrid high gradient permanent magnet quadrupole


Author(s): P. N’gotta, G. Le Bec, and J. Chavanne
This paper presents an innovative compact permanent magnet quadrupole with a strong gradient for potential use in future light source lattices. Its magnetic structure includes simple mechanical parts, rectangular permanent magnet blocks and soft iron poles. It has a wide aperture in the horizontal p…
[Phys. Rev. Accel. Beams 19, 122401] Published Tue Dec 20, 2016

Local transverse coupling impedance measurements in a synchrotron light source from turn-by-turn acquisitions


Author(s): Michele Carlà, Gabriele Benedetti, Thomas Günzel, Ubaldo Iriso, and Zeus Martí
Transverse beam coupling impedance is a source of beam instabilities that limits the machine performance in circular accelerators. Several beam based techniques have been used to measure the transverse impedance of an accelerator, usually based on the optics distortion produced by the impedance sour…
[Phys. Rev. Accel. Beams 19, 121002] Published Mon Dec 19, 2016