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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: 2018-01-19T23:03:01+00:00

 



Final focus system tuning studies towards Compact Linear Collider feasibility

2018-01-19T10:00:00+00:00

Author(s): E. Marin, A. Latina, R. Tomás, and D. Schulte

In this paper we present the latest results regarding the tuning study of the baseline design of the final focus system of the Compact Linear Collider (CLIC-FFS). CLIC aims to provide collisions to the experiments at a luminosity above ${10}^{34}\text{ }\text{ }\mathrm{c}{\mathrm{m}}^{−2}\text{ }{\m...


[Phys. Rev. Accel. Beams 21, 011003] Published Fri Jan 19, 2018



Nanomodulated electron beams via electron diffraction and emittance exchange for coherent x-ray generation

2018-01-19T10:00:00+00:00

Author(s): E. A. Nanni, W. S. Graves, and D. E. Moncton

A new concept for compact x-ray sources.

(image)
[Phys. Rev. Accel. Beams 21, 014401] Published Fri Jan 19, 2018



Comprehensive study of beam focusing by crystal devices

2018-01-18T10:00:00+00:00

Author(s): W. Scandale et al.

This paper is devoted to an experimental study of focusing and defocusing positively charged particle beams with the help of specially bent single crystals. Four crystals have been fabricated for this purpose. The studies have been performed at the CERN SPS in $400\text{ }\text{ }\mathrm{GeV}/c$ pro...


[Phys. Rev. Accel. Beams 21, 014702] Published Thu Jan 18, 2018



Exact cancellation of emittance growth due to coupled transverse dynamics in solenoids and rf couplers

2018-01-17T10:00:00+00:00

Author(s): David H. Dowell, Feng Zhou, and John Schmerge

Weak, rotated magnetic and radio frequency quadrupole fields in electron guns and injectors can couple the beam’s horizontal with vertical motion, introduce correlations between otherwise orthogonal transverse momenta, and reduce the beam brightness. This paper discusses two important sources of cou...


[Phys. Rev. Accel. Beams 21, 010101] Published Wed Jan 17, 2018



Quadrupole-free detector optics design for the Compact Linear Collider final focus system at 3 TeV

2018-01-17T10:00:00+00:00

Author(s): Fabien Plassard, Andrea Latina, Eduardo Marin, Rogelio Tomás, and Philip Bambade

Aiming to simplify the machine detector interface of the Compact Linear Collider (CLIC), a new detector model has been designed allowing the last quadrupole QD0 of the final focus system (FFS) to be located outside of the experiment with a distance ${L}^{*}$ from the interaction point of 6 m. In thi...


[Phys. Rev. Accel. Beams 21, 011002] Published Wed Jan 17, 2018



Emittance preservation of an electron beam in a loaded quasilinear plasma wakefield

2018-01-16T10:00:00+00:00

Author(s): Veronica K. Berglyd Olsen, Erik Adli, and Patric Muggli

We investigate beam loading and emittance preservation for a high-charge electron beam being accelerated in quasilinear plasma wakefields driven by a short proton beam. The structure of the studied wakefields are similar to those of a long, modulated proton beam, such as the AWAKE proton driver. We ...


[Phys. Rev. Accel. Beams 21, 011301] Published Tue Jan 16, 2018



Compact and intense parametric x-ray radiation source based on a linear accelerator with cryogenic accelerating and decelerating copper structures

2018-01-11T10:00:00+00:00

Author(s): J. Hyun, M. Satoh, M. Yoshida, T. Sakai, Y. Hayakawa, T. Tanaka, K. Hayakawa, I. Sato, and K. Endo

This paper describes a proposal for a compact x-ray source based on parametric x-ray radiation (PXR). The PXR, which is produced when a single crystal is bombarded with relativistic electrons, has good monochromaticity and spatial coherence, and is expected to be well suited for imaging of low-Z mat...


[Phys. Rev. Accel. Beams 21, 014701] Published Thu Jan 11, 2018



Extension of Busch’s theorem to particle beams

2018-01-10T10:00:00+00:00

Author(s): L. Groening, C. Xiao, and M. Chung

In 1926, H. Busch formulated a theorem for one single charged particle moving along a region with a longitudinal magnetic field [H. Busch, Berechnung der Bahn von Kathodenstrahlen in axial symmetrischen electromagnetischen Felde, Z. Phys. 81, 974 (1926)]. The theorem relates particle angular momentu...


[Phys. Rev. Accel. Beams 21, 014201] Published Wed Jan 10, 2018



Stabilization of the arrival time of a relativistic electron beam to the 50 fs level

2018-01-09T10:00:00+00:00

Author(s): J. Roberts, P. Skowronski, P. N. Burrows, G. B. Christian, R. Corsini, A. Ghigo, F. Marcellini, and C. Perry

We report the results of a low-latency beam phase feed-forward system built to stabilize the arrival time of a relativistic electron beam. The system was operated at the Compact Linear Collider (CLIC) Test Facility (CTF3) at CERN where the beam arrival time was stabilized to approximately 50 fs. The...


[Phys. Rev. Accel. Beams 21, 011001] Published Tue Jan 09, 2018



Announcement: Corrections in Physical Review Publications

2018-01-03T10:00:00+00:00

[Phys. Rev. Accel. Beams 21, 010002] Published Wed Jan 03, 2018



Reduction and compensation of the transient beam loading effect in a double rf system of synchrotron light sources

2018-01-03T10:00:00+00:00

Author(s): Naoto Yamamoto, Takeshi Takahashi, and Shogo Sakanaka

Double rf systems are used to lengthen the beam bunches in synchrotron light sources. In such a system, the performance of the bunch lengthening is limited by the transient beam-loading effect, which is induced by gaps in the fill pattern. To improve its performance, we investigate an application of...


[Phys. Rev. Accel. Beams 21, 012001] Published Wed Jan 03, 2018



Editorial: A Tale of Two Anniversaries: 125 Years of the Physical Review and 25 Years of Physical Review E

2018-01-02T10:00:00+00:00

Author(s): Matthew Salter and Michael Thoennessen
[Phys. Rev. Accel. Beams 21, 010001] Published Tue Jan 02, 2018



High efficiency laser-assisted ${\mathrm{H}}^{−}$ charge exchange for microsecond duration beams

2017-12-26T10:00:00+00:00

Author(s): Sarah Cousineau, Abdurahim Rakhman, Martin Kay, Alexander Aleksandrov, Viatcheslav Danilov, Timofey Gorlov, Yun Liu, Cary Long, Alexander Menshov, Michael Plum, Andrei Shishlo, Andrew Webster, and David Johnson

Laser-assisted stripping is a novel approach to ${\mathrm{H}}^{−}$ charge exchange that overcomes long-standing limitations associated with the traditional, foil-based method of producing high-intensity, time-structured beams of protons. This paper reports on the first successful demonstration of th...


[Phys. Rev. Accel. Beams 20, 120402] Published Tue Dec 26, 2017



Design and cold model experiment of a continuous-wave deuteron radio-frequency quadrupole

2017-12-22T10:00:00+00:00

Author(s): Q. Fu, K. Zhu, Y. R. Lu, M. J. Easton, S. L. Gao, Z. Wang, F. J. Jia, H. P. Li, P. P. Gan, and Y. He

A deuteron radio-frequency quadrupole (RFQ) is being built by the RFQ group at Peking University. It is a very compact high-current RFQ, operating at 162.5 MHz in continuous-wave mode. By optimizing the beam dynamics design, our simulations reached 98% transmission efficiency for acceleration of the...


[Phys. Rev. Accel. Beams 20, 120101] Published Fri Dec 22, 2017



Overtaking collision effects in a cw double-pass proton linac

2017-12-22T10:00:00+00:00

Author(s): Yue Tao, Ji Qiang, and Kilean Hwang

The recirculating superconducting proton linac has the advantage of reducing the number of cavities in the accelerator and the corresponding construction and operational costs. Beam dynamics simulations were done recently in a double-pass recirculating proton linac using a single proton beam bunch. ...


[Phys. Rev. Accel. Beams 20, 124202] Published Fri Dec 22, 2017



Efficiency versus instability in plasma accelerators

2017-12-20T10:00:00+00:00

Author(s): Valeri Lebedev, Alexey Burov, and Sergei Nagaitsev

Plasma wakefield acceleration is one of the main technologies being developed for future high-energy colliders. Potentially, it can create a cost-effective path to the highest possible energies for ${e}^{+}{e}^{−}$ or $γ−γ$ colliders and produce a profound effect on the developments for high-energy ...


[Phys. Rev. Accel. Beams 20, 121301] Published Wed Dec 20, 2017



High-gradient low-$β$ accelerating structure using the first negative spatial harmonic of the fundamental mode

2017-12-19T10:00:00+00:00

Author(s): Sergey V. Kutsaev, Ronald Agustsson, Salime Boucher, Richard Fischer, Alex Murokh, Brahim Mustapha, Alireza Nassiri, Peter N. Ostroumov, Alexander Plastun, Evgeny Savin, and Alexander Yu. Smirnov

The development of high-gradient accelerating structures for low-$β$ particles is the key for compact hadron linear accelerators. A particular example of such a machine is a hadron therapy linac, which is a promising alternative to cyclic machines, traditionally used for cancer treatment. Currently,...


[Phys. Rev. Accel. Beams 20, 120401] Published Tue Dec 19, 2017



Helical undulator based on partial redistribution of uniform magnetic field

2017-12-19T10:00:00+00:00

Author(s): N. Balal, I. V. Bandurkin, V. L. Bratman, and A. E. Fedotov

A new type of helical undulator based on redistribution of magnetic field of a solenoid by ferromagnetic helix has been proposed and studied both in theory and experiment. Such undulators are very simple and efficient for promising sources of coherent spontaneous THz undulator radiation from dense e...


[Phys. Rev. Accel. Beams 20, 122401] Published Tue Dec 19, 2017



Higher-order mode-based cavity misalignment measurements at the free-electron laser FLASH

2017-12-19T10:00:00+00:00

Author(s): Thorsten Hellert, Nicoleta Baboi, and Liangliang Shi

At the Free-Electron Laser in Hamburg (FLASH) and the European X-Ray Free-Electron Laser, superconducting TeV-energy superconducting linear accelerator (TESLA)-type cavities are used for the acceleration of electron bunches, generating intense free-electron laser (FEL) beams. A long rf pulse structu...


[Phys. Rev. Accel. Beams 20, 123501] Published Tue Dec 19, 2017



Announcement: Changes to the Table of Contents of Physical Review Accelerators and Beams

2017-12-18T10:00:00+00:00

[Phys. Rev. Accel. Beams 20, 120001] Published Mon Dec 18, 2017



Sideband instability analysis based on a one-dimensional high-gain free electron laser model

2017-12-18T10:00:00+00:00

Author(s): Cheng-Ying Tsai, Juhao Wu, Chuan Yang, Moohyun Yoon, and Guanqun Zhou

When an untapered high-gain free electron laser (FEL) reaches saturation, the exponential growth ceases and the radiation power starts to oscillate about an equilibrium. The FEL radiation power or efficiency can be increased by undulator tapering. For a high-gain tapered FEL, although the power is e...


[Phys. Rev. Accel. Beams 20, 120702] Published Mon Dec 18, 2017



Numerical investigation of space charge effects on the positions of beamlets for transversely split beams

2017-12-15T10:00:00+00:00

Author(s): S. Machida, C. Prior, S. Gilardoni, M. Giovannozzi, A. Huschauer, and S. Hirlander

The use of transversely split beams was proposed some years ago as a means to perform extraction from a circular particle accelerator over multiple turns. In the course of studies carried out to increase understanding of the beam behavior, space charge effects have been probed. The experimental resu...


[Phys. Rev. Accel. Beams 20, 121001] Published Fri Dec 15, 2017



Microbunching instability study in a linac-driven free electron laser spreader beam line

2017-12-14T10:00:00+00:00

Author(s): S. Di Mitri and S. Spampinati

Suppression of the microbunching instability is a priority for free electron lasers (FELs) whose goal is production of intense coherent radiation with very narrow spectral bandwidth. The instability can have large gain in multibend switchyard lines that connect the accelerator to multiple undulator ...


[Phys. Rev. Accel. Beams 20, 120701] Published Thu Dec 14, 2017



Photocathode quantum efficiency of ultrathin ${\mathrm{Cs}}_{2}\mathrm{Te}$ layers on Nb substrates

2017-12-14T10:00:00+00:00

Author(s): Zikri Yusof, Adam Denchfield, Mark Warren, Javier Cardenas, Noah Samuelson, Linda Spentzouris, John Power, and John Zasadzinski

The quantum efficiencies (QE) of photocathodes consisting of bulk Nb substrates coated with thin films of ${\mathrm{Cs}}_{2}\mathrm{Te}$ are reported. Using the standard recipe for ${\mathrm{Cs}}_{2}\mathrm{Te}$ deposition developed for Mo substrates (220 Å Te thickness), a $\mathrm{QE}∼11%–13%$ at ...


[Phys. Rev. Accel. Beams 20, 123401] Published Thu Dec 14, 2017



Realistic simulations of a cyclotron spiral inflector within a particle-in-cell framework

2017-12-11T10:00:00+00:00

Author(s): Daniel Winklehner, Andreas Adelmann, Achim Gsell, Tulin Kaman, and Daniela Campo

We present an upgrade to the particle-in-cell ion beam simulation code opal that enables us to run highly realistic simulations of the spiral inflector system of a compact cyclotron. This upgrade includes a new geometry class and field solver that can handle the complicated boundary conditions posed...


[Phys. Rev. Accel. Beams 20, 124201] Published Mon Dec 11, 2017



Evolution of a beam dynamics model for the transport line in a proton therapy facility

2017-12-11T10:00:00+00:00

Author(s): V. Rizzoglio, A. Adelmann, C. Baumgarten, M. Frey, A. Gerbershagen, D. Meer, and J. M. Schippers

During the conceptual design of an accelerator or beamline, first-order beam dynamics models are essential for studying beam properties. However, they can only produce approximate results. During commissioning, these approximate results are compared to measurements, which will rarely coincide if the...


[Phys. Rev. Accel. Beams 20, 124702] Published Mon Dec 11, 2017



Computer codes for beam dynamics analysis of cyclotronlike accelerators

2017-12-11T10:00:00+00:00

Author(s): V. Smirnov

Computer codes suitable for the study of beam dynamics in cyclotronlike (classical and isochronous cyclotrons, synchrocyclotrons, and fixed field alternating gradient) accelerators are reviewed. Computer modeling of cyclotron segments, such as the central zone, acceleration region, and extraction sy...


[Phys. Rev. Accel. Beams 20, 124801] Published Mon Dec 11, 2017



Development of a radio-frequency quadrupole cooler for high beam currents

2017-12-06T10:00:00+00:00

Author(s): Ramzi Boussaid, G. Ban, G. Quéméner, Y. Merrer, and J. Lorry

The SHIRaC prototype is a recently developed radio-frequency quadrupole (RFQ) beam cooler with an improved optics design to deliver the required beam quality to a high resolution separator (HRS). For an isobaric separation of isotopes, the HRS demands beams with emittance not exceeding $3π\text{ }\t...


[Phys. Rev. Accel. Beams 20, 124701] Published Wed Dec 06, 2017



Gain cascading scheme of a free-electron-laser oscillator

2017-11-30T10:00:00+00:00

Author(s): Kai Li and Haixiao Deng

The low-gain free-electron laser (FEL) oscillators are cutting-edge tools to produce fully coherent radiation in the spectral region from terahertz to vacuum ultraviolet, and potentially in hard x ray. In this paper, it is proposed to utilize an FEL oscillator with multistage undulators to enable ga...


[Phys. Rev. Accel. Beams 20, 110703] Published Thu Nov 30, 2017



Threshold of transverse mode coupling instability with arbitrary space charge

2017-11-30T10:00:00+00:00

Author(s): V. Balbekov

The threshold of the transverse mode coupling instability is calculated in framework of the square well model at arbitrary value of space charge tune shift. A new method of calculation is developed beyond the traditional expansion technique. The square, resistive, and exponential wakes are investiga...


[Phys. Rev. Accel. Beams 20, 114401] Published Thu Nov 30, 2017



Upgrade possibilities for continuous wave rf electron guns based on room-temperature very high frequency technology

2017-11-27T10:00:00+00:00

Author(s): F. Sannibale, D. Filippetto, M. Johnson, D. Li, T. Luo, C. Mitchell, J. Staples, S. Virostek, R. Wells, and J. M. Byrd

The past decade was characterized by an increasing scientific demand for extending towards higher repetition rates (MHz class and beyond) the performance of already operating lower repetition rate accelerator-based instruments such as x-ray free electron lasers (FELs) and ultrafast electron diffract...


[Phys. Rev. Accel. Beams 20, 113402] Published Mon Nov 27, 2017



Local correction of quadrupole errors at LHC interaction regions using action and phase jump analysis on turn-by-turn beam position data

2017-11-22T10:00:00+00:00

Author(s): Javier Fernando Cardona, Alba Carolina García Bonilla, and Rogelio Tomás García

This article shows that the effect of all quadrupole errors present in an interaction region with low $β*$ can be modeled by an equivalent magnetic kick, which can be estimated from action and phase jumps found on beam position data. This equivalent kick is used to find the strengths that certain no...


[Phys. Rev. Accel. Beams 20, 111004] Published Wed Nov 22, 2017



Unavoidable trapped mode in the interaction region of colliding beams

2017-11-22T10:00:00+00:00

Author(s): Alexander Novokhatski, Michael Sullivan, Eleonora Belli, Miguel Gil Costa, and Roberto Kersevan

We discuss the nature of the electromagnetic fields excited by the beams in the beam pipe of an interaction region. In trying to find an optimum geometry for this region with a minimum of electromagnetic wave excitation, we have discovered one mode, which remains even in a very smooth geometry. This...


[Phys. Rev. Accel. Beams 20, 111005] Published Wed Nov 22, 2017



Characterizing temporal coherence of visible synchrotron radiation with heterodyne near field speckles

2017-11-21T10:00:00+00:00

Author(s): M. Siano, B. Paroli, M. A. C. Potenza, U. Iriso, A. A. Nosych, L. Torino, S. Mazzoni, G. Trad, and A. N. Goldblatt

In this paper we extensively describe the heterodyne near field speckle method (HNFS) to characterize both spatial and temporal coherence of synchrotron radiation (SR). The method relies on Fourier analysis of near field speckles generated by scattering from nanoparticles suspended in a liquid. A cr...


[Phys. Rev. Accel. Beams 20, 110702] Published Tue Nov 21, 2017



Accelerator performance analysis of the Fermilab Muon Campus

2017-11-21T10:00:00+00:00

Author(s): Diktys Stratakis, Mary E. Convery, Carol Johnstone, John Johnstone, James P. Morgan, Dean Still, Jason D. Crnkovic, Vladimir Tishchenko, William M. Morse, and Michael J. Syphers

Fermilab is dedicated to hosting world-class experiments in search of new physics that will operate in the coming years. The Muon g-2 Experiment is one such experiment that will determine with unprecedented precision the muon anomalous magnetic moment, which offers an important test of the Standard ...


[Phys. Rev. Accel. Beams 20, 111003] Published Tue Nov 21, 2017



High quality electron bunch generation using a longitudinal density-tailored plasma-based accelerator in the three-dimensional blowout regime

2017-11-21T10:00:00+00:00

Author(s): X. L. Xu, F. Li, W. An, T. N. Dalichaouch, P. Yu, W. Lu, C. Joshi, and W. B. Mori

Plasma-based acceleration in density down ramps is proposed to generate electron beams with unprecedented combinations of brightness and energy spread, which can drive a new class of compact free-electron-lasers and linear colliders.

(image)
[Phys. Rev. Accel. Beams 20, 111303] Published Tue Nov 21, 2017



Transparent lattice characterization with gated turn-by-turn data of diagnostic bunch train

2017-11-21T10:00:00+00:00

Author(s): Yongjun Li, Weixing Cheng, Kiman Ha, and Robert Rainer

Methods of characterization of a storage ring’s lattice have traditionally been intrusive to routine operations. More importantly, the lattice seen by particles can drift with the beam current due to collective effects. To circumvent this, we have developed a novel approach for dynamically character...


[Phys. Rev. Accel. Beams 20, 112802] Published Tue Nov 21, 2017



First accelerator test of vacuum components with laser-engineered surfaces for electron-cloud mitigation

2017-11-20T10:00:00+00:00

Author(s): Sergio Calatroni, Elisa Garcia-Tabares Valdivieso, Holger Neupert, Valentin Nistor, Ana Teresa Perez Fontenla, Mauro Taborelli, Paolo Chiggiato, Oleg Malyshev, Reza Valizadeh, Stefan Wackerow, Svetlana A. Zolotovskaya, W. Allan Gillespie, and Amin Abdolvand

Laser treatment of an accelerator vacuum chamber is shown to be an efficient and robust measure against electron-cloud formation.

(image)
[Phys. Rev. Accel. Beams 20, 113201] Published Mon Nov 20, 2017



High efficiency tapered free-electron lasers with a prebunched electron beam

2017-11-17T10:00:00+00:00

Author(s): C. Emma, N. Sudar, P. Musumeci, A. Urbanowicz, and C. Pellegrini

In this paper we analyze the high gain, high efficiency tapered free-electron laser amplifier with a prebunched electron beam. Simple scaling laws are derived for the peak output power and extraction efficiency and verified using 1D simulations. These studies provide useful analytical expressions wh...


[Phys. Rev. Accel. Beams 20, 110701] Published Fri Nov 17, 2017



Publisher’s Note: Model-based optimization of tapered free-electron lasers [Phys. Rev. ST Accel. Beams 18, 040702 (2015)]

2017-11-17T10:00:00+00:00

Author(s): Alan Mak, Francesca Curbis, and Sverker Werin
[Phys. Rev. Accel. Beams 20, 119902] Published Fri Nov 17, 2017



Publisher’s Note: Phase jump method for efficiency enhancement in free-electron lasers [Phys. Rev. Accel. Beams 20, 060703 (2017)]

2017-11-14T10:00:00+00:00

Author(s): Alan Mak, Francesca Curbis, and Sverker Werin
[Phys. Rev. Accel. Beams 20, 119901] Published Tue Nov 14, 2017



Analytical $N$ beam position monitor method

2017-11-10T10:00:00+00:00

Author(s): A. Wegscheider, A. Langner, R. Tomás, and A. Franchi

Measurement and correction of focusing errors is of great importance for performance and machine protection of circular accelerators. Furthermore LHC needs to provide equal luminosities to the experiments ATLAS and CMS. High demands are also set on the speed of the optics commissioning, as the fores...


[Phys. Rev. Accel. Beams 20, 111002] Published Fri Nov 10, 2017



Development for a supercompact $X$-band pulse compression system and its application at SLAC

2017-11-09T10:00:00+00:00

Author(s): Juwen W. Wang, Sami G. Tantawi, Chen Xu, Matt Franzi, Patrick Krejcik, Gordon Bowden, Shantha Condamoor, Yuantao Ding, Valery Dolgashev, John Eichner, Andrew Haase, James R. Lewandowski, and Liling Xiao

We have successfully designed, fabricated, installed, and tested a super compact $X$-band SLAC Energy Doubler system at SLAC. It is composed of an elegant 3 dB coupler–mode converter–polarizer coupled to a single spherical energy storage cavity with high ${Q}_{0}$ of 94000 and a diameter less than 1...


[Phys. Rev. Accel. Beams 20, 110401] Published Thu Nov 09, 2017



Temperature-dependent quantum efficiency degradation of K-Cs-Sb bialkali antimonide photocathodes grown by a triple-element codeposition method

2017-11-09T10:00:00+00:00

Author(s): Zihao Ding, Siddharth Karkare, Jun Feng, Daniele Filippetto, Matthew Johnson, Steve Virostek, Fernando Sannibale, James Nasiatka, Mengjia Gaowei, John Sinsheimer, Erik Muller, John Smedley, and Howard Padmore

K-Cs-Sb bialkali antimonide photocathodes grown by a triple-element codeposition method have been found to have excellent quantum efficiency (QE) and outstanding near-atomic surface smoothness and have been employed in the VHF gun in the Advanced Photoinjector Experiment (APEX), however, their robus...


[Phys. Rev. Accel. Beams 20, 113401] Published Thu Nov 09, 2017



Low energy tertiary beam line design for the CERN neutrino platform project

2017-11-07T10:00:00+00:00

Author(s): N. Charitonidis and I. Efthymiopoulos

In the framework of CERN neutrino platform project at the CERN SPS North Area, two new beam lines have been designed as extensions of the existing secondary beam lines, able to provide low energy particles in the momentum range of 0.4 to $12\text{ }\text{ }\mathrm{GeV}/c$. The layout of these very l...


[Phys. Rev. Accel. Beams 20, 111001] Published Tue Nov 07, 2017



Beam dynamics analysis of dielectric laser acceleration using a fast 6D tracking scheme

2017-11-03T10:00:00+00:00

Author(s): Uwe Niedermayer, Thilo Egenolf, and Oliver Boine-Frankenheim

An important step toward high fidelity beam-transport codes for dielectric laser accelerators is presented with the long-term goal of building an entire microchip-sized laser-driven accelerator.

(image)
[Phys. Rev. Accel. Beams 20, 111302] Published Fri Nov 03, 2017



rf design of a pulse compressor with correction cavity chain for klystron-based compact linear collider

2017-11-03T10:00:00+00:00

Author(s): Ping Wang, Hao Zha, Igor Syratchev, Jiaru Shi, and Huaibi Chen

We present an X-band high-power pulse compression system for a klystron-based compact linear collider. In this system design, one rf power unit comprises two klystrons, a correction cavity chain, and two SLAC Energy Doubler (SLED)-type X-band pulse compressors (SLEDX). An rf pulse passes the correct...


[Phys. Rev. Accel. Beams 20, 112001] Published Fri Nov 03, 2017



Temporal profile monitor based on electro-optic spatial decoding for low-energy bunches

2017-11-03T10:00:00+00:00

Author(s): Wei Wang, Yingchao Du, Lixin Yan, Zhijun Chi, Zhen Zhang, Jianfei Hua, Wenhui Huang, Chuanxiang Tang, and Ming Li

The measurement of electron bunch temporal profile is one of the key diagnostics in accelerators, especially for ultrashort bunches. The electro-optic (EO) technique enables the precise longitudinal characterization of bunch electric field in a single-shot and nondestructive way, which can simultane...


[Phys. Rev. Accel. Beams 20, 112801] Published Fri Nov 03, 2017



Emittance preservation in plasma-based accelerators with ion motion

2017-11-01T10:00:00+00:00

Author(s): C. Benedetti, C. B. Schroeder, E. Esarey, and W. P. Leemans

In a plasma-accelerator-based linear collider, the density of matched, low-emittance, high-energy particle bunches required for collider applications can be orders of magnitude above the background ion density, leading to ion motion, perturbation of the focusing fields, and, hence, to beam emittance...


[Phys. Rev. Accel. Beams 20, 111301] Published Wed Nov 01, 2017



Magnesium diboride on inner wall of copper tube: A test case for superconducting radio frequency cavities

2017-10-31T10:00:00+00:00

Author(s): Wenura K. Withanage, N. H. Lee, Sashank V. Penmatsa, M. A. Wolak, A. Nassiri, and X. X. Xi

Superconductor magnesium diboride is considered one of the viable materials to substitute bulk niobium for superconducting radio frequency cavities. Utilizing a ${\mathrm{MgB}}_{2}$ coating on the inner wall of a copper cavity will allow operation at higher temperatures (20–25 K) than Nb cavities du...


[Phys. Rev. Accel. Beams 20, 102002] Published Tue Oct 31, 2017



High-quality electron beam generation in a proton-driven hollow plasma wakefield accelerator

2017-10-26T10:00:00+00:00

Author(s): Y. Li, G. Xia, K. V. Lotov, A. P. Sosedkin, K. Hanahoe, and O. Mete-Apsimon

Simulations of proton-driven plasma wakefield accelerators have demonstrated substantially higher accelerating gradients compared to conventional accelerators and the viability of accelerating electrons to the energy frontier in a single plasma stage. However, due to the strong intrinsic transverse ...


[Phys. Rev. Accel. Beams 20, 101301] Published Thu Oct 26, 2017



Spatial control of photoemitted electron beams using a microlens-array transverse-shaping technique

2017-10-26T10:00:00+00:00

Author(s): A. Halavanau, G. Qiang, G. Ha, E. Wisniewski, P. Piot, J. G. Power, and W. Gai

A transversely inhomogeneous laser distribution on the photocathode surface generally produces electron beams with degraded beam quality. In this paper, we explore the use of microlens arrays to dramatically improve the transverse uniformity of an ultraviolet drive-laser pulse used in a photoinjecto...


[Phys. Rev. Accel. Beams 20, 103404] Published Thu Oct 26, 2017



Modeling of second order space charge driven coherent sum and difference instabilities

2017-10-26T10:00:00+00:00

Author(s): Yao-Shuo Yuan, Oliver Boine-Frankenheim, and Ingo Hofmann

Second order coherent oscillation modes in intense particle beams play an important role for beam stability in linear or circular accelerators. In addition to the well-known second order even envelope modes and their instability, coupled even envelope modes and odd (skew) modes have recently been sh...


[Phys. Rev. Accel. Beams 20, 104201] Published Thu Oct 26, 2017



Temperature dependence of alkali-antimonide photocathodes: Evaluation at cryogenic temperatures

2017-10-24T10:00:00+00:00

Author(s): M. A. Mamun, M. R. Hernandez-Flores, E. Morales, C. Hernandez-Garcia, and M. Poelker

${\mathrm{Cs}}_{x}{\mathrm{K}}_{y}\mathrm{Sb}$ photocathodes were manufactured on a niobium substrate and evaluated over a range of temperatures from 300 to 77 K. Vacuum conditions were identified that minimize surface contamination due to gas adsorption when samples were cooled below room temperatu...


[Phys. Rev. Accel. Beams 20, 103403] Published Tue Oct 24, 2017






Electromagnetic fields and Green’s functions in elliptical vacuum chambers

2017-10-23T10:00:00+00:00

Author(s): S. Persichelli, N. Biancacci, M. Migliorati, L. Palumbo, and V. G. Vaccaro

In this paper, we discuss the electromagnetic interaction between a point charge travelling inside a waveguide of elliptical cross section, and the waveguide itself. By using a convenient expansion of the Mathieu functions, useful in particular for treating a variety of problems in applied mathemati...


[Phys. Rev. Accel. Beams 20, 101004] Published Mon Oct 23, 2017



Measurements of wake-induced electron beam deflection in a dechirper at the Linac Coherent Light Source

2017-10-19T10:00:00+00:00

Author(s): Johann Zemella, Karl Bane, Alan Fisher, Marc Guetg, Zhirong Huang, Richard Iverson, Patrick Krejcik, Alberto Lutman, Timothy Maxwell, Alexander Novokhatski, Gennady Stupakov, Zhen Zhang, Mark Harrison, and Marcos Ruelas

The RadiaBeam/SLAC dechirper, a structure consisting of pairs of flat, metallic, corrugated plates, has been installed just upstream of the undulators in the Linac Coherent Light Source (LCLS). As a dechirper, with the beam passing between the plates on axis, longitudinal wakefields are induced that...


[Phys. Rev. Accel. Beams 20, 104403] Published Thu Oct 19, 2017



Aligning linac accelerating structures using a copropagating octupolar mode

2017-10-16T10:00:00+00:00

Author(s): J. Ögren and V. Ziemann

We propose a novel method to align accelerating structures such as those used in the Compact Linear Collider (CLIC) by exploiting a mode that copropagates with the normal accelerating mode. This mode has an octupolar dependence in the transverse direction and is caused by radial waveguides intended ...


[Phys. Rev. Accel. Beams 20, 102801] Published Mon Oct 16, 2017



Medical therapy and imaging fixed-field alternating-gradient accelerator with realistic magnets

2017-10-16T10:00:00+00:00

Author(s): S. Tygier, K. B. Marinov, R. B. Appleby, J. A. Clarke, J. M. Garland, H. L. Owen, and B. J. A. Shepherd

NORMA is a design for a normal-conducting racetrack fixed-field alternating-gradient accelerator for protons from 50 to 350 MeV. In this article we show the development from an idealized lattice to a design implemented with field maps from rigorous two-dimensional (2D) and three-dimensional (3D) FEM...


[Phys. Rev. Accel. Beams 20, 104702] Published Mon Oct 16, 2017



Optimal radius of crystal curvature for planar channeling of high-energy negatively charged particles in a bent crystal

2017-10-13T10:00:00+00:00

Author(s): I. V. Kirillin

The problem of planar channeling of high-energy negatively charged particles in a bent crystal was considered on the basis of analytical calculation and numerical simulation. We show the existence of an optimal radius of crystal curvature for planar channeling, corresponding to the maximum deflectio...


[Phys. Rev. Accel. Beams 20, 104401] Published Fri Oct 13, 2017



Analysis of transverse beam stabilization with radio frequency quadrupoles

2017-10-13T10:00:00+00:00

Author(s): M. Schenk, A. Grudiev, K. Li, and K. Papke

A radio frequency (rf) quadrupole has been considered as a potential alternative device for Landau damping in circular hadron colliders. The objective of this study is to benchmark and confirm its stabilizing effect predicted by stability diagram theory by means of numerical tracking simulations. To...


[Phys. Rev. Accel. Beams 20, 104402] Published Fri Oct 13, 2017



High current nonlinear transmission line based electron beam driver

2017-10-12T10:00:00+00:00

Author(s): B. W. Hoff, D. M. French, D. S. Simon, P. D. Lepell, T. Montoya, and S. L. Heidger

A gigawatt-class nonlinear transmission line based electron beam driver is experimentally demonstrated. Four experimental series, each with a different Marx bank charge voltage (15, 20, 25, and 30 kV), were completed. Within each experimental series, shots at peak frequencies ranging from 950 MHz to...


[Phys. Rev. Accel. Beams 20, 100401] Published Thu Oct 12, 2017



Efficient model for low-energy transverse beam dynamics in a nine-cell 1.3 GHz cavity

2017-10-12T10:00:00+00:00

Author(s): Thorsten Hellert, Martin Dohlus, and Winfried Decking

FLASH and the European XFEL are SASE-FEL user facilities, at which superconducting TESLA cavities are operated in a pulsed mode to accelerate long bunch-trains. Several cavities are powered by one klystron. While the low-level rf system is able to stabilize the vector sum of the accelerating gradien...


[Phys. Rev. Accel. Beams 20, 100702] Published Thu Oct 12, 2017



Cavity voltage phase modulation to reduce the high-luminosity Large Hadron Collider rf power requirements

2017-10-10T10:00:00+00:00

Author(s): T. Mastoridis, P. Baudrenghien, and J. Molendijk

For uneven bunch filling patterns, adapting the rf voltage reference reduces the klystron power and allows operation at higher beam intensity.

[Phys. Rev. Accel. Beams 20, 101003] Published Tue Oct 10, 2017



3D multiphysics modeling of superconducting cavities with a massively parallel simulation suite

2017-10-10T10:00:00+00:00

Author(s): Oleksiy Kononenko, Chris Adolphsen, Zenghai Li, Cho-Kuen Ng, and Claudio Rivetta

Radiofrequency cavities based on superconducting technology are widely used in particle accelerators for various applications. The cavities usually have high quality factors and hence narrow bandwidths, so the field stability is sensitive to detuning from the Lorentz force and external loads, includ...


[Phys. Rev. Accel. Beams 20, 102001] Published Tue Oct 10, 2017



Experimental studies of 7-cell dual axis asymmetric cavity for energy recovery linac

2017-10-10T10:00:00+00:00

Author(s): I. V. Konoplev, K. Metodiev, A. J. Lancaster, G. Burt, R. Ainsworth, and A. Seryi

High average current, transportable energy recovery linacs (ERLs) can be very attractive tools for a number of applications including next generation high-luminosity, compact light sources. Conventional ERLs are based on an electron beam circulating through the same set of rf cavity cells. This lead...


[Phys. Rev. Accel. Beams 20, 103501] Published Tue Oct 10, 2017



Beam-beam amplitude detuning with forced oscillations

2017-10-09T10:00:00+00:00

Author(s): R. Tomás, X. Buffat, S. White, J. Barranco, P. Gonçalves Jorge, and T. Pieloni

Recently, relations were established between the coefficients of free and forced amplitude detuning polynomial expansions. The forced oscillations were considered only in a single plane. In this paper we extend and generalize previous results by developing analytical equations that transform the fre...


[Phys. Rev. Accel. Beams 20, 101002] Published Mon Oct 09, 2017



Control and performance improvements of a pulse compressor in use for testing accelerating structures at high power

2017-10-05T10:00:00+00:00

Author(s): Benjamin Woolley, Igor Syratchev, and Amos Dexter

New developments relating to compact X-band, SLED-I type pulse compressors being developed at CERN for testing high gradient structures are described. Pulse compressors of interest take rf pulses from one or more high power klystrons with duration typically $>1.5\text{ }\text{ }μ\mathrm{s}$ and d...


[Phys. Rev. Accel. Beams 20, 101001] Published Thu Oct 05, 2017



Generation of a femtosecond electron microbunch train from a photocathode using twofold Michelson interferometer

2017-10-04T10:00:00+00:00

Author(s): M. Shevelev, A. Aryshev, N. Terunuma, and J. Urakawa

The interest in producing ultrashort electron bunches has risen sharply among scientists working on the design of high-gradient wakefield accelerators. One attractive approach generating electron bunches is to illuminate a photocathode with a train of femtosecond laser pulses. In this paper we descr...


[Phys. Rev. Accel. Beams 20, 103401] Published Wed Oct 04, 2017



Effect of double frequency heating on the lead afterglow beam currents of an electron cyclotron resonance ion source

2017-10-04T10:00:00+00:00

Author(s): V. Toivanen, G. Bellodi, D. Küchler, F. Wenander, and O. Tarvainen

The effect of double frequency heating on the performance of the CERN GTS-LHC 14.5 GHz Electron Cyclotron Resonance (ECR) ion source in afterglow mode is reported. The source of the secondary microwave frequency was operated both in pulsed and continuous wave (CW) modes within the range of 12–18 GHz...


[Phys. Rev. Accel. Beams 20, 103402] Published Wed Oct 04, 2017



Development and operating experience of a 1.1-m-long superconducting undulator at the Advanced Photon Source

2017-10-03T10:00:00+00:00

Author(s): Y. Ivanyushenkov, K. Harkay, M. Borland, R. Dejus, J. Dooling, C. Doose, L. Emery, J. Fuerst, J. Gagliano, Q. Hasse, M. Kasa, P. Kenesei, V. Sajaev, K. Schroeder, N. Sereno, S. Shastri, Y. Shiroyanagi, D. Skiadopoulos, M. Smith, X. Sun, E. Trakhtenberg, A. Xiao, A. Zholents, and E. Gluskin

Development of superconducting undulators continues at the Advanced Photon Source (APS). Two years after successful installation and commissioning of the first relatively short superconducting undulator “SCU0” in Sector 6 of the APS storage ring, the second 1.1-m-long superconducting undulator “SCU1...


[Phys. Rev. Accel. Beams 20, 100701] Published Tue Oct 03, 2017



Design of an $X$-band electron linear accelerator dedicated to decentralized $^{99}\mathrm{Mo}/^{99m}\mathrm{Tc}$ supply: From beam energy selection to yield estimation

2017-10-03T10:00:00+00:00

Author(s): Jaewoong Jang, Masashi Yamamoto, and Mitsuru Uesaka

The most frequently used radionuclide in diagnostic nuclear medicine, $^{99m}\mathrm{Tc}$, is generally obtained by the decay of its parent radionuclide, $^{99}\mathrm{Mo}$. Recently, concerns have been raised over shortages of $^{99}\mathrm{Mo}{/}^{99m}\mathrm{Tc}$, owing to aging of the research r...


[Phys. Rev. Accel. Beams 20, 104701] Published Tue Oct 03, 2017



Publisher’s Note: Analytical description of photon beam phase spaces in inverse Compton scattering sources [Phys. Rev. Accel. Beams 20, 080701 (2017)]

2017-10-03T10:00:00+00:00

Author(s): C. Curatolo, I. Drebot, V. Petrillo, and L. Serafini
[Phys. Rev. Accel. Beams 20, 109901] Published Tue Oct 03, 2017



4-twist helix snake to maintain polarization in multi-GeV proton rings

2017-09-27T10:00:00+00:00

Author(s): F. Antoulinakis, Y. Chen, A. Dutton, E. Rossi De La Fuente, S. Haupert, E. A. Ljungman, P. D. Myers, J. K. Thompson, A. Tai, C. A. Aidala, E. D. Courant, A. D. Krisch, M. A. Leonova, W. Lorenzon, R. S. Raymond, D. W. Sivers, V. K. Wong, T. Yang, Y. S. Derbenev, V. S. Morozov, and A. M. Kondratenko

Solenoid Siberian snakes have successfully maintained polarization in particle rings below 1 GeV, but never in multi-GeV rings, because the spin rotation by a solenoid is inversely proportional to the beam momentum. High energy rings, such as Brookhaven’s 255 GeV Relativistic Heavy Ion Collider (RHI...


[Phys. Rev. Accel. Beams 20, 091003] Published Wed Sep 27, 2017



Control of systematic uncertainties in the storage ring search for an electric dipole moment by measuring the electric quadrupole moment

2017-09-27T10:00:00+00:00

Author(s): Andrzej Magiera

Measurements of electric dipole moment (EDM) for light hadrons with use of a storage ring have been proposed. The expected effect is very small, therefore various subtle effects need to be considered. In particular, interaction of particle’s magnetic dipole moment and electric quadrupole moment with...


[Phys. Rev. Accel. Beams 20, 094001] Published Wed Sep 27, 2017



Analysis of multibunch free electron laser operation

2017-09-26T10:00:00+00:00

Author(s): Thorsten Hellert, Winfried Decking, and Julien Branlard

At the SASE-FEL user facilities FLASH and European XFEL, superconducting TESLA type cavities are used for acceleration of the driving electron bunches. The high achievable duty cycle allows for operating with long bunch trains, hence considerably increasing the efficiency of the machine. However, mu...


[Phys. Rev. Accel. Beams 20, 090702] Published Tue Sep 26, 2017



Characterization of thermal neutron beam monitors

2017-09-26T10:00:00+00:00

Author(s): F. Issa, A. Khaplanov, R. Hall-Wilton, I. Llamas, M. Dalseth Riktor, S. R. Brattheim, and H. Perrey

Neutron beam monitors with a wide range of efficiencies, low $γ$ sensitivity, and high time and space resolution are required in neutron beam experiments to continuously diagnose the delivered beam. In this work, commercially available neutron beam monitors have been characterized using the R2D2 bea...


[Phys. Rev. Accel. Beams 20, 092801] Published Tue Sep 26, 2017



Intense highly charged ion beam production and operation with a superconducting electron cyclotron resonance ion source

2017-09-21T10:00:00+00:00

Author(s): H. W. Zhao, L. T. Sun, J. W. Guo, W. Lu, D. Z. Xie, D. Hitz, X. Z. Zhang, and Y. Yang

The superconducting electron cyclotron resonance ion source with advanced design in Lanzhou (SECRAL) is a superconducting-magnet-based electron cyclotron resonance ion source (ECRIS) for the production of intense highly charged heavy ion beams. It is one of the best performing ECRISs worldwide and t...


[Phys. Rev. Accel. Beams 20, 094801] Published Thu Sep 21, 2017



Compensation of head-on beam-beam induced resonance driving terms and tune spread in the Relativistic Heavy Ion Collider

2017-09-13T10:00:00+00:00

Author(s): W. Fischer, X. Gu, K. A. Drees, C. Liu, Y. Luo, A. Marusic, R. Michnoff, T. A. Miller, M. Minty, C. Montag, A. I. Pikin, G. Robert-Demolaize, V. Schoefer, P. Thieberger, and S. M. White

A head-on beam-beam compensation scheme was implemented for operation in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory [Phys. Rev. Lett. 115, 264801 (2015)]. The compensation consists of electron lenses for the reduction of the beam-beam induced tune spread, and a latt...


[Phys. Rev. Accel. Beams 20, 091001] Published Wed Sep 13, 2017



Modeling of beam-induced damage of the LHC tertiary collimators

2017-09-13T10:00:00+00:00

Author(s): E. Quaranta, A. Bertarelli, R. Bruce, F. Carra, F. Cerutti, A. Lechner, S. Redaelli, E. Skordis, and P. Gradassi

Modern hadron machines with high beam intensity may suffer from material damage in the case of large beam losses and even beam-intercepting devices, such as collimators, can be harmed. A systematic method to evaluate thresholds of damage owing to the impact of high energy particles is therefore cruc...


[Phys. Rev. Accel. Beams 20, 091002] Published Wed Sep 13, 2017



Fabrication and cold test of dielectric assist accelerating structure

2017-09-12T10:00:00+00:00

Author(s): D. Satoh, M. Yoshida, and N. Hayashizaki

We present the detailed description of a successful design and cold testing of the dielectric assist accelerating (DAA) structure. The DAA structure consists of ultralow-loss dielectric cylinders and disks with irises which are periodically arranged in a metallic enclosure. The advantage of the DAA ...


[Phys. Rev. Accel. Beams 20, 091302] Published Tue Sep 12, 2017



Optimizing density down-ramp injection for beam-driven plasma wakefield accelerators

2017-09-06T10:00:00+00:00

Author(s): A. Martinez de la Ossa, Z. Hu, M. J. V. Streeter, T. J. Mehrling, O. Kononenko, B. Sheeran, and J. Osterhoff

Density down-ramp (DDR) injection is a promising concept in beam-driven plasma wakefield accelerators for the generation of high-quality witness beams. We review and complement the theoretical principles of the method and employ particle-in-cell (PIC) simulations in order to determine constrains on ...


[Phys. Rev. Accel. Beams 20, 091301] Published Wed Sep 06, 2017



Thermal considerations in the cryogenic regime for the BNL double ridge higher order mode waveguide

2017-09-06T10:00:00+00:00

Author(s): Dhananjay K. Ravikumar, Yatming Than, Wencan Xu, and Jon Longtin

Brookhaven National Laboratory (BNL) has proposed to build an electron ion collider (EIC) as an upgrade to the existing Relativistic Heavy Ion Collider (RHIC). A part of the new design is to use superconducting radio frequency (SRF) cavities for acceleration, which sit in a bath of superfluid helium...


[Phys. Rev. Accel. Beams 20, 093201] Published Wed Sep 06, 2017



Matching-based fresh-slice method for generating two-color x-ray free-electron lasers

2017-09-05T10:00:00+00:00

Author(s): Weilun Qin, Yuantao Ding, Alberto A. Lutman, and Yu-Chiu Chao

A two-color free-electron laser pulse can be generated in a split undulator configuration, where a controllable quadrupole wakefield induces a time-dependent mismatch along the bunch.

(image)
[Phys. Rev. Accel. Beams 20, 090701] Published Tue Sep 05, 2017



Digital low level rf control system with four different intermediate frequencies for the International Linear Collider

2017-09-05T10:00:00+00:00

Author(s): Sigit Basuki Wibowo, Toshihiro Matsumoto, Shinichiro Michizono, Takako Miura, Feng Qiu, and Na Liu

A field programmable gate array–based digital low level rf (LLRF) control system will be used in the International Linear Collider (ILC) in order to satisfy the rf stability requirements. The digital LLRF control system with four different intermediate frequencies has been developed to decrease the ...


[Phys. Rev. Accel. Beams 20, 093501] Published Tue Sep 05, 2017



Space charge effects on the third order coupled resonance

2017-08-31T10:00:00+00:00

Author(s): Giuliano Franchetti, Simone Gilardoni, Alexander Huschauer, Frank Schmidt, and Raymond Wasef

Periodic resonance crossing in higher dimensions explains beam loss observed in space charge dominated hadron-storage rings.

(image)
[Phys. Rev. Accel. Beams 20, 081006] Published Thu Aug 31, 2017



Application of transfer matrix and transfer function analysis to grating-type dielectric laser accelerators: Ponderomotive focusing of electrons

2017-08-31T10:00:00+00:00

Author(s): Andrzej Szczepkowicz

The question of suitability of transfer matrix description of electrons traversing grating-type dielectric laser acceleration (DLA) structures is addressed. It is shown that although matrix considerations lead to interesting insights, the basic transfer properties of DLA cells cannot be described by...


[Phys. Rev. Accel. Beams 20, 081302] Published Thu Aug 31, 2017



Interaction region design driven by energy deposition

2017-08-30T10:00:00+00:00

Author(s): Roman Martin, Maria Ilaria Besana, Francesco Cerutti, Andy Langner, Rogelio Tomás, Emilia Cruz-Alaniz, and Barbara Dalena

The European Strategy Group for High Energy Physics recommends to study collider designs for the post-LHC era. Among the suggested projects there is the circular 100 TeV proton-proton collider FCC-hh. Starting from LHC and its proposed upgrade HL-LHC, this paper outlines the development of the inter...


[Phys. Rev. Accel. Beams 20, 081005] Published Wed Aug 30, 2017



Suppression of stored-beam oscillation and observation of flux improvement during top-up injection

2017-08-30T10:00:00+00:00

Author(s): Y-G. Son, J.-Y. Kim, C. Mitsuda, K. Kobayashi, J. Ko, T-Y. Lee, J-Y. Choi, D-E. Kim, H-S. Seo, H-S. Han, K-S. Park, C-D. Park, and S. Shin

This paper describes a start-to-end study of the suppression of stored-beam oscillation during top-up injection at the Pohang Light Source (PLS-II) beam line. The fast counterkicker implemented in PLS-II suppresses stored-beam oscillations in the vertical plane. During top-up injection in the magnet...


[Phys. Rev. Accel. Beams 20, 082803] Published Wed Aug 30, 2017



Effort towards symmetric removal and surface smoothening of 1.3-GHz niobium single-cell cavity in vertical electropolishing using a unique cathode

2017-08-29T10:00:00+00:00

Author(s): Vijay Chouhan, Shigeki Kato, Keisuke Nii, Takanori Yamaguchi, Motoaki Sawabe, Hitoshi Hayano, and Yoshiaki Ida

A detailed study on vertical electropolishing (VEP) of a 1.3-GHz single-cell niobium coupon cavity, which contains six coupons and four viewports at different positions, is reported. The cavity was vertically electropolished using a conventional rod and three types of unique cathodes named as Ninja ...


[Phys. Rev. Accel. Beams 20, 083502] Published Tue Aug 29, 2017



High gain harmonic generation free electron lasers enhanced by pseudoenergy bands

2017-08-24T10:00:00+00:00

Author(s): Takashi Tanaka and Ryota Kinjo

We propose a new scheme for high gain harmonic generation free electron lasers (HGHG FELs), which is seeded by a pair of intersecting laser beams to interact with an electron beam in a modulator undulator located in a dispersive section. The interference of the laser beams gives rise to a two-dimens...


[Phys. Rev. Accel. Beams 20, 080706] Published Thu Aug 24, 2017



Compact compressive arc and beam switchyard for energy recovery linac-driven ultraviolet free electron lasers

2017-08-23T10:00:00+00:00

Author(s): J. A. G. Akkermans, S. Di Mitri, D. Douglas, and I. D. Setija

High gain free electron lasers (FELs) driven by high repetition rate recirculating accelerators have received considerable attention in the scientific and industrial communities in recent years. Cost-performance optimization of such facilities encourages limiting machine size and complexity, and a c...


[Phys. Rev. Accel. Beams 20, 080705] Published Wed Aug 23, 2017



Excitation of a nonlinear plasma ion wake by intense energy sources with applications to the crunch-in regime

2017-08-23T10:00:00+00:00

Author(s): Aakash A. Sahai

We show the excitation of a nonlinear ion-wake mode by plasma electron modes in the bubble regime driven by intense energy sources, using analytical theory and simulations. The ion wake is shown to be a driven nonlinear ion-acoustic wave in the form of a long-lived cylindrical ion soliton which limi...


[Phys. Rev. Accel. Beams 20, 081004] Published Wed Aug 23, 2017



Large Hadron Collider momentum calibration and accuracy

2017-08-21T10:00:00+00:00

Author(s): E. Todesco and J. Wenninger

As a result of the excellent quality of the Large Hadron Collider (LHC) experimental detectors and the accurate calibration of the luminosity at the LHC, uncertainties on the LHC beam energy may contribute significantly to the measurement errors on certain observables unless the relative uncertainty...


[Phys. Rev. Accel. Beams 20, 081003] Published Mon Aug 21, 2017



Ultraviolet laser transverse profile shaping for improving x-ray free electron laser performance

2017-08-17T10:00:00+00:00

Author(s): S. Li, S. Alverson, D. Bohler, A. Egger, A. Fry, S. Gilevich, Z. Huang, A. Miahnahri, D. Ratner, J. Robinson, and F. Zhou

The photocathode rf gun is one of the most critical components in x-ray free electron lasers. The drive laser strikes the photocathode surface, which emits electrons with properties that depend on the shape of the drive laser. Most free electron lasers use photocathodes with work function in the ult...


[Phys. Rev. Accel. Beams 20, 080704] Published Thu Aug 17, 2017



Quasi-half-cycle pulses of light from a tapered undulator

2017-08-15T10:00:00+00:00

Author(s): V. A. Goryashko

Strong-field few-cycle terahertz (THz) pulses are an invaluable tool for engineering highly nonequilibrium states of matter. A scheme is proposed to generate quasi-half-cycle GV/m-scale THz pulses with a multikilohertz repetition rate. It makes use of coherent spontaneous emission from a prebunched ...


[Phys. Rev. Accel. Beams 20, 080703] Published Tue Aug 15, 2017



Design of an rf quadrupole for Landau damping

2017-08-15T10:00:00+00:00

Author(s): K. Papke and A. Grudiev

The recently proposed superconducting quadrupole resonator for Landau damping in accelerators is subjected to a detailed design study. The optimization process of two different cavity types is presented following the requirements of the High Luminosity Large Hadron Collider (HL-LHC) with the main fo...


[Phys. Rev. Accel. Beams 20, 082001] Published Tue Aug 15, 2017



Low-emittance thermionic-gun-based injector for a compact free-electron laser

2017-08-14T10:00:00+00:00

Author(s): Takao Asaka, Hiroyasu Ego, Hirohumi Hanaki, Toru Hara, Taichi Hasegawa, Teruaki Hasegawa, Takahiro Inagaki, Toshiaki Kobayashi, Chikara Kondo, Hirokazu Maesaka, Shinichi Matsubara, Sakuo Matsui, Takashi Ohshima, Yuji Otake, Tatsuyuki Sakurai, Shinsuke Suzuki, Yasuyuki Tajiri, Shinichiro Tanaka, Kazuaki Togawa, and Hitoshi Tanaka

A low-emittance thermionic-gun-based injector was developed for the x-ray free-electron laser (XFEL) facility known as the SPring-8 angstrom compact free-electron laser (SACLA). The thermionic-gun-based system has the advantages of maintainability, reliability, and stability over a photocathode radi...


[Phys. Rev. Accel. Beams 20, 080702] Published Mon Aug 14, 2017



Final implementation, commissioning, and performance of embedded collimator beam position monitors in the Large Hadron Collider

2017-08-10T10:00:00+00:00

Author(s): Gianluca Valentino, Guillaume Baud, Roderik Bruce, Marek Gasior, Alessio Mereghetti, Daniele Mirarchi, Jakub Olexa, Stefano Redaelli, Belen Salvachua, Alessandra Valloni, and Jorg Wenninger

During Long Shutdown 1, 18 Large Hadron Collider (LHC) collimators were replaced with a new design, in which beam position monitor (BPM) pick-up buttons are embedded in the collimator jaws. The BPMs provide a direct measurement of the beam orbit at the collimators, and therefore can be used to align...


[Phys. Rev. Accel. Beams 20, 081002] Published Thu Aug 10, 2017



Direct injection of fully stripped carbon ions into a fast-cycling induction synchrotron and their capture by the barrier bucket

2017-08-09T10:00:00+00:00

Author(s): N. Munemoto, S. Takano, E. Kadokura, Taufik, T. Yoshimoto, X. Liu, T. Adachi, M. Ikeda, T. Kawakubo, K. Okamura, K. Takayama, and M. Wake

Fully stripped carbon ions generated in a laser-ablation ion source are directly injected into a small-scale induction synchrotron. Carbon-ion beams of ${\mathrm{C}}^{6+}$, ${\mathrm{C}}^{5+}$, and ${\mathrm{C}}^{4+}$ are trapped in the barrier bucket. Beam properties, such as the momentum spread an...


[Phys. Rev. Accel. Beams 20, 080101] Published Wed Aug 09, 2017