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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: 2017-09-23T05:54:31+00:00


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


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


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


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


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


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


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


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.

[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


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


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.

[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


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


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


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


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


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


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


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


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


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


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


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


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


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


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

rf measurements and tuning of the 750 MHz radio frequency quadrupole


Author(s): Benjamin Koubek, Alexej Grudiev, and Marc Timmins

In the framework of the program on medical applications a compact 750 MHz RFQ has been designed and built to be used as an injector for a hadron therapy linac. This RFQ was designed to accelerate protons to an energy of 5 MeV within only 2 m length. It is divided into four segments and equipped with...

[Phys. Rev. Accel. Beams 20, 080102] Published Wed Aug 09, 2017

Numerical simulations of energy deposition caused by 50 MeV—50 TeV proton beams in copper and graphite targets


Author(s): Y. Nie, R. Schmidt, V. Chetvertkova, G. Rosell-Tarragó, F. Burkart, and D. Wollmann

The conceptual design of the Future Circular Collider (FCC) is being carried out actively in an international collaboration hosted by CERN, for the post–Large Hadron Collider (LHC) era. The target center-of-mass energy of proton-proton collisions for the FCC is 100 TeV, nearly an order of magnitude ...

[Phys. Rev. Accel. Beams 20, 081001] Published Wed Aug 09, 2017

Manipulation of laser-accelerated proton beam profiles by nanostructured and microstructured targets


Author(s): L. Giuffrida, K. Svensson, J. Psikal, M. Dalui, H. Ekerfelt, I. Gallardo Gonzalez, O. Lundh, A. Persson, P. Lutoslawski, V. Scuderi, J. Kaufman, T. Wiste, T. Lastovicka, A. Picciotto, A. Bagolini, M. Crivellari, P. Bellutti, G. Milluzzo, G. A. P. Cirrone, J. Magnusson, A. Gonoskov, G. Korn, C-G. Wahlström, and D. Margarone

Nanostructured and microstructured thin foils have been fabricated and used experimentally as targets to manipulate the spatial profile of proton bunches accelerated through the interaction with high intensity laser pulses ($6×{10}^{19}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$). Monolayers of po...

[Phys. Rev. Accel. Beams 20, 081301] Published Fri Aug 04, 2017

Improving the precision of linear optics measurements based on turn-by-turn beam position monitor data after a pulsed excitation in lepton storage rings


Author(s): L. Malina, J. Coello de Portugal, T. Persson, P. K. Skowroński, R. Tomás, A. Franchi, and S. Liuzzo

Beam optics control is of critical importance for machine performance and protection. Nowadays, turn-by-turn (TbT) beam position monitor (BPM) data are increasingly exploited as they allow for fast and simultaneous measurement of various optics quantities. Nevertheless, so far the best documented un...

[Phys. Rev. Accel. Beams 20, 082802] Published Fri Aug 04, 2017

Analytical description of photon beam phase spaces in inverse Compton scattering sources


Author(s): C. Curatolo, I. Drebot, V. Petrillo, and L. Serafini

We revisit the description of inverse Compton scattering sources and the photon beams generated therein, emphasizing the behavior of their phase space density distributions and how they depend upon those of the two colliding beams of electrons and photons. The main objective is to provide practical ...

[Phys. Rev. Accel. Beams 20, 080701] Published Thu Aug 03, 2017

New solution for the high accuracy alignment of accelerator components


Author(s): D. Caiazza, N. Catalan Lasheras, H. Mainaud Durand, M. Modena, C. Sanz, D. Tshilumba, V. Vlachakis, M. Wendt, and S. Zorzetti

Several state-of-the-art metrology measurement methods have been investigated and combined for a fiducialization of accelerator components in the micrometric regime. The PACMAN project at CERN applied stretched-wire measurement methods to Compact Linear Collider quadrupole and cavity beam position m...

[Phys. Rev. Accel. Beams 20, 083501] Published Thu Aug 03, 2017

Reversible beam heater for suppression of microbunching instability by transverse gradient undulators


Author(s): Tao Liu, Weilun Qin, Dong Wang, and Zhirong Huang

The microbunching instability driven by beam collective effects in a linear accelerator of a free-electron laser (FEL) facility significantly degrades the electron beam quality and FEL performance. A conventional method to suppress this instability is to introduce an additional uncorrelated energy s...

[Phys. Rev. Accel. Beams 20, 082801] Published Wed Aug 02, 2017

Permanent magnet based dipole magnets for next generation light sources


Author(s): Takahiro Watanabe, Tsutomu Taniuchi, Shiro Takano, Tsuyoshi Aoki, and Kenji Fukami

We have developed permanent magnet based dipole magnets for the next generation light sources. Permanent magnets are advantageous over electromagnets in that they consume less power, are physically more compact, and there is a less risk of power supply failure. However, experience with electromagnet...

[Phys. Rev. Accel. Beams 20, 072401] Published Mon Jul 31, 2017

Chromaticity effects on head-tail instabilities for broadband impedance using two particle model, Vlasov analysis, and simulations


Author(s): Yong Ho Chin, Alexander Wu Chao, Michael M. Blaskiewicz, and Yoshihiro Shobuda

Effects of the chromaticity on head-tail instabilities for broadband impedances are comprehensively studied, using the two particle model, the Vlasov analysis and computer simulations. We show both in the two particle model and the Vlasov analysis with the trapezoidal (semiconstant) wake model that ...

[Phys. Rev. Accel. Beams 20, 071003] Published Fri Jul 28, 2017

Thermally assisted photoemission effect on ${\mathrm{CeB}}_{6}$ and ${\mathrm{LaB}}_{6}$ for application as photocathodes


Author(s): K. Torgasin, K. Morita, H. Zen, K. Masuda, T. Katsurayama, T. Murata, S. Suphakul, H. Yamashita, T. Nogi, T. Kii, K. Nagasaki, and H. Ohgaki

The thermally assisted photoemission (TAPE) effect was investigated for the hexaboride thermionic cathodes (${\mathrm{LaB}}_{6}$ and ${\mathrm{CeB}}_{6}$). It was found that the quantum efficiency of these cathodes can be increased by raising the cathode temperature along with the thermionic emissio...

[Phys. Rev. Accel. Beams 20, 073401] Published Tue Jul 25, 2017

Using a Bessel light beam as an ultrashort period helical undulator


Author(s): B. C. Jiang, Q. L. Zhang, J. H. Chen, and Z. T. Zhao

An undulator is a critical component to produce synchrotron radiation and a free electron laser. When a Bessel light beam carrying the orbit angular momentum copropagates with an electron beam bunch, a net transverse deflection force will be subjected to the latter one. As a result of dephasing effe...

[Phys. Rev. Accel. Beams 20, 070701] Published Mon Jul 24, 2017

Analysis of emissions from prebunched electron beams


Author(s): Jia Qika

The emissions of the prebunched electron beam, including the coherent spontaneous emission and the self-amplified stimulated emission, are analyzed by using one-dimensional FEL theory. Neglecting the interaction of the electrons and the radiation field, the formula of the coherent spontaneous emissi...

[Phys. Rev. Accel. Beams 20, 070702] Published Mon Jul 24, 2017

Proton irradiated graphite grades for a long baseline neutrino facility experiment


Author(s): N. Simos, P. Nocera, Z. Zhong, R. Zwaska, N. Mokhov, J. Misek, K. Ammigan, P. Hurh, and Z. Kotsina

In search of a low-Z pion production target for the Long Baseline Neutrino Facility (LBNF) of the Deep Underground Neutrino Experiment (DUNE) four graphite grades were irradiated with protons in the energy range of 140–180 MeV, to peak fluence of $∼6.1×{10}^{20}\text{ }\text{ }\mathrm{p}/{\mathrm{cm...

[Phys. Rev. Accel. Beams 20, 071002] Published Mon Jul 24, 2017

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


Author(s): B. Seznec, Ph. Dessante, T. Jager, L. Caillault, Ph. Teste, and T. Minea

Microparticles (MP) and thermofield emission in vacuum are mainly caused by the roughness present at the surface of electrodes holding a high voltage. They can act as a trigger for breakdown, especially under high vacuum. This theoretical study discusses the interactions between one MP and the therm...

[Phys. Rev. Accel. Beams 20, 073501] Published Mon Jul 24, 2017

Crystal collimator systems for high energy frontier


Author(s): A. I. Sytov, V. V. Tikhomirov, and A. S. Lobko

Crystalline collimators can potentially considerably improve the cleaning performance of the presently used collimator systems using amorphous collimators. A crystal-based collimation scheme which relies on the channeling particle deflection in bent crystals has been proposed and extensively studied...

[Phys. Rev. Accel. Beams 20, 071001] Published Thu Jul 13, 2017

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


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

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


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

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

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

Hamiltonian approach to slip-stacking dynamics


Author(s): S. Y. Lee and K. Y. Ng

Hamiltonian dynamics has been applied to study the slip-stacking dynamics. The canonical-perturbation method is employed to obtain the second-harmonic correction term in the slip-stacking Hamiltonian. The Hamiltonian approach provides a clear optimal method for choosing the slip-stacking parameter a...

[Phys. Rev. Accel. Beams 20, 064202] Published Thu Jun 29, 2017

Challenges of in-vacuum and cryogenic permanent magnet undulator technologies


Author(s): Jui-Che Huang, Hideo Kitamura, Chin-Kang Yang, Cheng-Hsing Chang, Cheng-Hsiang Chang, and Ching-Shiang Hwang

An in-vacuum undulator (IVU) provides a means to reach high-brilliance x rays in medium energy storage rings. The development of short period undulators with low phase errors creates the opportunity for an unprecedented brilliant light source in a storage ring. Since the spectral quality from cryoge...

[Phys. Rev. Accel. Beams 20, 064801] Published Thu Jun 29, 2017

Phase jump method for efficiency enhancement in free-electron lasers


Author(s): Alan Mak, Francesca Curbis, and Sverker Werin

The efficiency of a free-electron laser can be enhanced by the phase jump method. The method utilizes the phase-shifting chicanes in the drift sections between the undulator segments. By applying appropriate phase jumps, the microbunched electron beam can decelerate and radiate coherently beyond the...

[Phys. Rev. Accel. Beams 20, 060703] Published Thu Jun 22, 2017

Coherent resonance stop bands in alternating gradient beam transport


Author(s): K. Ito, H. Okamoto, Y. Tokashiki, and K. Fukushima

An extensive experimental study is performed to confirm fundamental resonance bands of an intense hadron beam propagating through an alternating gradient linear transport channel. The present work focuses on the most common lattice geometry called “FODO” or “doublet” that consists of two quadrupoles...

[Phys. Rev. Accel. Beams 20, 064201] Published Thu Jun 22, 2017

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


Author(s): H. Hotchi, H. Harada, N. Hayashi, S. Kato, M. Kinsho, K. Okabe, P. K. Saha, Y. Shobuda, F. Tamura, N. Tani, Y. Watanabe, K. Yamamoto, M. Yamamoto, and M. Yoshimoto

The 3-GeV rapid cycling synchrotron (RCS) of the Japan Proton Accelerator Research Complex (J-PARC) is now in the final beam commissioning phase, aiming for a design output beam power of 1 MW. With a series of injector linac upgrades in 2013 and 2014, RCS developed a high-intensity beam test, and la...

[Phys. Rev. Accel. Beams 20, 060402] Published Mon Jun 19, 2017

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


Author(s): T. J. Burris-Mog, C. A. Ekdahl, and D. C. Moir

The image displacement instability (IDI) has been measured on the 20 MeV Axis I of the dual axis radiographic hydrodynamic test facility and compared to theory. A 0.23 kA electron beam was accelerated across 64 gaps in a low solenoid focusing field, and the position of the beam centroid was measured...

[Phys. Rev. Accel. Beams 20, 060403] Published Mon Jun 19, 2017

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


Author(s): E. Hemsing, B. Garcia, Z. Huang, T. Raubenheimer, and D. Xiang

We analytically examine the bunching factor spectrum of a relativistic electron beam with sinusoidal energy structure that then undergoes an echo-enabled harmonic generation (EEHG) transformation to produce high harmonics. The performance is found to be described primarily by a simple scaling parame...

[Phys. Rev. Accel. Beams 20, 060702] Published Mon Jun 19, 2017

LHC optics commissioning: A journey towards 1% optics control


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

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

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

Laser-triggered proton acceleration from hydrogenated low-density targets


Author(s): A. V. Brantov, E. A. Obraztsova, A. L. Chuvilin, E. D. Obraztsova, and V. Yu. Bychenkov

Synchronized proton acceleration by ultraintense slow light (SASL) in low-density targets has been studied in application to fabricated carbon nanotube films. Proton acceleration from low-density plasma films irradiated by a linearly polarized femtosecond laser pulse of ultrarelativistic intensity w...

[Phys. Rev. Accel. Beams 20, 061301] Published Mon Jun 19, 2017

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


Author(s): S. S. Baturin and A. Zholents

The interrelation between the accelerating gradient and the transformer ratio in the collinear wakefield accelerator has been analyzed. It has been shown that the high transformer ratio and the high efficiency of the energy transfer from the drive bunch to the witness bunch can only be achieved at t...

[Phys. Rev. Accel. Beams 20, 061302] Published Mon Jun 19, 2017

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


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

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

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

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


Author(s): A. Huschauer, A. Blas, J. Borburgh, S. Damjanovic, S. Gilardoni, M. Giovannozzi, M. Hourican, K. Kahle, G. Le Godec, O. Michels, G. Sterbini, and C. Hernalsteens

Following a successful commissioning period, the multiturn extraction (MTE) at the CERN Proton Synchrotron (PS) has been applied for the fixed-target physics programme at the Super Proton Synchrotron (SPS) since September 2015. This exceptional extraction technique was proposed to replace the long-s...

[Phys. Rev. Accel. Beams 20, 061001] Published Wed Jun 14, 2017

Coherent synchrotron radiation by electrons moving on circular orbits


Author(s): Yunhai Cai

We study coherent synchrotron radiation by electrons in the Frenet-Serret coordinate system with a constant curvature $1/ρ$. Based on the Hamiltonian in the Courant-Synder theory of particle accelerators, we find in general that the transverse force is essentially the Lorentz force but with a substi...

[Phys. Rev. Accel. Beams 20, 064402] Published Wed Jun 14, 2017

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


Author(s): A. Galatà, D. Mascali, G. Torrisi, L. Neri, L. Celona, and J. Angot

Electron cyclotron resonance ion sources based charge breeders (ECR-CB) are fundamental devices for Isotope Separation On Line (ISOL) facilities aiming at postaccelerating radioactive ion beams (RIBs). Presently, low intensity RIBs do not allow a conventional tuning of the ECR-CB: as a consequence, ...

[Phys. Rev. Accel. Beams 20, 063401] Published Tue Jun 13, 2017

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


Author(s): Kouichi Soutome and Hitoshi Tanaka

Nowadays, designs for ring-based light sources use multibend lattices for achieving a very small emittance of around 100 pmrad. In this type of storage ring, the chromaticity correcting sextupoles generally have greater strengths than those used in typical third-generation light sources. Therefore, ...

[Phys. Rev. Accel. Beams 20, 064001] Published Tue Jun 13, 2017

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


Author(s): A. Lasheen and E. Shaposhnikova

Longitudinal instabilities are one of the main limitations in the CERN Super Proton Synchrotron (SPS) to reach the beam parameters required for the High Luminosity LHC project. In preparation to the SPS upgrade, possible remedies are studied by performing macroparticle simulations using the machine ...

[Phys. Rev. Accel. Beams 20, 064401] Published Tue Jun 13, 2017

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


Author(s): K. Papke, F. Gerigk, and U. van Rienen

Higher order modes (HOMs) may affect beam stability and refrigeration requirements of superconducting proton linacs such as the Superconducting Proton Linac, which is studied at CERN. Under certain conditions beam-induced HOMs can accumulate sufficient energy to destabilize the beam or quench the su...

[Phys. Rev. Accel. Beams 20, 060401] Published Mon Jun 12, 2017

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


Author(s): Vasilis Tzoganis, Hao D. Zhang, Adam Jeff, and Carsten P. Welsch

Noninterceptive beam profile monitors are of great importance for many particle accelerators worldwide. Extra challenges are posed by high energy, high intensity machines and low energy low intensity accelerators. For these applications, existing diagnostics are no longer suitable due to the high po...

[Phys. Rev. Accel. Beams 20, 062801] Published Mon Jun 12, 2017

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


Author(s): Y. Sakai, I. Gadjev, P. Hoang, N. Majernik, A. Nause, A. Fukasawa, O. Williams, M. Fedurin, B. Malone, C. Swinson, K. Kusche, M. Polyanskiy, M. Babzien, M. Montemagno, Z. Zhong, P. Siddons, I. Pogorelsky, V. Yakimenko, T. Kumita, Y. Kamiya, and J. B. Rosenzweig

Inverse Compton scattering (ICS) is a unique mechanism for producing fast pulses—picosecond and below—of bright photons, ranging from x to $γ$ rays. These nominally narrow spectral bandwidth electromagnetic radiation pulses are efficiently produced in the interaction between intense, well-focused el...

[Phys. Rev. Accel. Beams 20, 060701] Published Mon Jun 05, 2017

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


Author(s): A. Sosa, D. S. Bollinger, P. R. Karns, and C. Y. Tan

The magnetron ${\mathrm{H}}^{−}$ ion sources developed in the 1970s currently in operation at Fermilab provide beam to the rest of the accelerator complex. A series of modifications to these sources have been tested in a dedicated off-line test stand with the aim of improving different operational i...

[Phys. Rev. Accel. Beams 20, 050102] Published Wed May 31, 2017

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


Author(s): A. Opanasenko, V. Mytrochenko, V. Zhaunerchyk, and V. A. Goryashko

We propose a novel gridless continuous-wave radiofrequency (rf) thermionic gun capable of generating nC ns electron bunches with a rms normalized slice emittance close to the thermal level of 0.3 mm mrad. In order to gate the electron emission, an externally heated thermionic cathode is installed in...

[Phys. Rev. Accel. Beams 20, 053401] Published Wed May 31, 2017

Review of linear optics measurement and correction for charged particle accelerators


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

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

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

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


Author(s): K. K. Swanson, H.-E. Tsai, S. K. Barber, R. Lehe, H.-S. Mao, S. Steinke, J. van Tilborg, K. Nakamura, C. G. R. Geddes, C. B. Schroeder, E. Esarey, and W. P. Leemans

Control of the properties of laser-plasma-accelerated electron beams that were injected along a shock-induced density downramp through precision tailoring of the density profile was demonstrated using a 1.8 J, 45 fs laser interacting with a mm-scale gas jet. The effects on the beam spatial profile, ...

[Phys. Rev. Accel. Beams 20, 051301] Published Tue May 30, 2017

Joule heating in a flat dechirper


Author(s): Karl Bane, Gennady Stupakov, and Erion Gjonaj

We perform Joule power loss calculations for a flat dechirper. We consider the configurations of the beam on-axis between the two plates—for chirp control—and for the beam especially close to one plate—for use as a fast kicker. Our calculations use a surface impedance approach, one that is valid whe...

[Phys. Rev. Accel. Beams 20, 054403] Published Tue May 30, 2017

Optical circular deflector with attosecond resolution for ultrashort electron beam


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

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

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

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


Author(s): J. Qiang, Y. Ding, P. Emma, Z. Huang, D. Ratner, T. O. Raubenheimer, M. Venturini, and F. Zhou

The shot-noise driven microbunching instability can significantly degrade electron beam quality in x-ray free electron laser light sources. Experiments were carried out at the Linac Coherent Light Source (LCLS) to study this instability. In this paper, we present start-to-end simulations of the shot...

[Phys. Rev. Accel. Beams 20, 054402] Published Tue May 23, 2017

Symplectic modeling of beam loading in electromagnetic cavities


Author(s): Dan T. Abell, Nathan M. Cook, and Stephen D. Webb

Simulating beam loading in radio frequency accelerating structures is critical for understanding higher-order mode effects on beam dynamics, such as beam break-up instability in energy recovery linacs. Full wave simulations of beam loading in radio frequency structures are computationally expensive,...

[Phys. Rev. Accel. Beams 20, 052002] Published Mon May 22, 2017

Vlasov analysis of microbunching instability for magnetized beams


Author(s): C.-Y. Tsai, Ya. S. Derbenev, D. Douglas, R. Li, and C. Tennant

For a high-brightness electron beam with high bunch charge traversing a recirculation beam line, coherent synchrotron radiation and space charge effects may result in microbunching instability (MBI). Both tracking simulation and Vlasov analysis for an early design of a circulator cooler ring (CCR) f...

[Phys. Rev. Accel. Beams 20, 054401] Published Fri May 19, 2017

High brilliance uranium beams for the GSI FAIR


Author(s): W. Barth, A. Adonin, Ch. E. Düllmann, M. Heilmann, R. Hollinger, E. Jäger, O. Kester, J. Khuyagbaatar, J. Krier, E. Plechov, P. Scharrer, W. Vinzenz, H. Vormann, A. Yakushev, and S. Yaramyshev

The 40 years old GSI-UNILAC (Universal Linear Accelerator) as well as the heavy ion synchrotron SIS18 will serve as a high current heavy ion injector for the new FAIR (Facility for Antiproton and Ion Research) synchrotron SIS100. In the context of an advanced machine investigation program in combina...

[Phys. Rev. Accel. Beams 20, 050101] Published Mon May 15, 2017

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


Author(s): A. Bogomyagkov and E. Levichev

The manuscript describes several monochromatization schemes starting from A. Renieri’s [Report No. LNF-75/6(R)] proposal for head-on collisions based on correlation between particles transverse position and energy deviation. We briefly explain the initial proposal and expand it for crossing angle co...

[Phys. Rev. Accel. Beams 20, 051001] Published Mon May 15, 2017

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


Author(s): Xiaowei Wu, Jiaru Shi, Huaibi Chen, Jiahang Shao, Tetsuo Abe, Toshiyasu Higo, Shuji Matsumoto, and Walter Wuensch

A Compact Linear Collider prototype traveling-wave accelerator structure fabricated at Tsinghua University was recently high-gradient tested at the High Energy Accelerator Research Organization (KEK). This $X$-band structure showed good high-gradient performance of up to $100\text{ }\text{ }\mathrm{...

[Phys. Rev. Accel. Beams 20, 052001] Published Mon May 08, 2017

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


Author(s): Zhen Zhang, Lixin Yan, Yingchao Du, Wenhui Huang, Chuanxiang Tang, and Zhirong Huang

We propose a method based on the slice energy spread modulation to generate strong subpicosecond density bunching in high-intensity relativistic electron beams. A laser pulse with periodic intensity envelope is used to modulate the slice energy spread of the electron beam, which can then be converte...

[Phys. Rev. Accel. Beams 20, 050701] Published Fri May 05, 2017

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


Author(s): X. Yang, V. Smaluk, L. H. Yu, Y. Tian, and K. Ha

A novel technique has been developed to improve the precision and shorten the measurement time of the LOCO (linear optics from closed orbits) method. This technique, named AC LOCO, is based on sine-wave (ac) beam excitation via fast correctors. Such fast correctors are typically installed at synchro...

[Phys. Rev. Accel. Beams 20, 054001] Published Tue May 02, 2017

Confining continuous manipulations of accelerator beam-line optics


Author(s): Ph. Amstutz, T. Plath, S. Ackermann, J. Bödewadt, C. Lechner, and M. Vogt

Altering the optics in one section of a linear accelerator beam line will in general cause an alteration of the optics in all downstream sections. In circular accelerators, changing the optical properties of any beam-line element will have an impact on the optical functions throughout the whole mach...

[Phys. Rev. Accel. Beams 20, 042802] Published Fri Apr 28, 2017

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


Author(s): P. Pierini, M. Bertucci, A. Bosotti, J. F. Chen, C. G. Maiano, P. Michelato, L. Monaco, M. Moretti, C. Pagani, R. Paparella, D. Sertore, and E. Vogel

We report the experience of the production, processing and qualification testing of the superconducting radio frequency cavities at 3.9 GHz for the third harmonic system at the European XFEL (EXFEL) injector. The rf structure concept, originally developed for the FLASH FEL facility, was adapted to t...

[Phys. Rev. Accel. Beams 20, 042006] Published Thu Apr 27, 2017

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


Author(s): M. Dayyani Kelisani, S. Doebert, and M. Aslaninejad

For the Compact Linear Collider project at CERN, the power for the main linacs is extracted from a drive beam generated from a high current electron source. The design of the electron source and its subsequent focusing channel has a great impact on the beam dynamic considerations of the drive beam. ...

[Phys. Rev. Accel. Beams 20, 043403] Published Thu Apr 27, 2017

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


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

Misalignment measurement of femtosecond electron bunches with THz repetition rate


Author(s): J. Zhu, E. Chiadroni, R. Assmann, M. Bellaveglia, A. Cianchi, M. Ferrario, A. Giribono, B. Marchetti, A. Mostacci, L. Piersanti, R. Pompili, and F. Villa

Generation of a well-aligned bunch train is of vital importance for preserving the beam quality in a plasma wake-field accelerator. The simultaneous measurements of the relative misalignments in both planes, of the individual femtosecond electron bunches with THz repetition rate in a train, are repo...

[Phys. Rev. Accel. Beams 20, 042801] Published Wed Apr 26, 2017

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


Author(s): Illya Drebot, D. Micieli, E. Milotti, V. Petrillo, E. Tassi, and L. Serafini

We present the dimensioning of a photon-photon collider based on Compton gamma sources for the observation of Breit-Wheeler pair production and QED $γγ$ events. Two symmetric electron beams, generated by photocathodes and accelerated in linacs, produce two gamma ray beams through Compton back scatte...

[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 $1.4\text{  }\mathrm{MeV}/\mathrm{u}$ 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 applicatio...

[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...

[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 (${\mathrm{D}}_{2}\mathrm{O...

[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