bluuebunny/crossref_metadata_2025_split huggingface dataset:
Beam dynamics of high chromaticity lattice for Iranian light source facility (ILSF) storage ring
Authors: Foroughi F , Jazayeri S M , Ahmadi E , Rahighi J , Dastan S 
Published: December 2019

Abstract
One of the limiting factors of electron beam lifetime in low emittance storage rings is Head-Tail (HT) instability. Low emittance storage rings typically have a large negative natural chromaticity due to the strong quadrupoles. Above transition large negative natural chromaticity leads to large Head-Tail instability which limit the beam lifetime. Since the threshold current of HT instability is directly related to linear chromaticity, increasing the linear chromaticity to slightly positive value is a solution to prevent HT instability. In this paper we in-creased the chromaticity of Iranian Light Source Facility (ILSF) to (+4, +4) and we will investigate the beam dynamics of ILSF 3GeV storage ring in high chromaticity. For reaching this aim we have used two families of sextupoles for chromaticity correction and then optimized them to maximize the dynamic aperture and Touschek lifetime. The beam dynamics of high chromaticity lattice is presented in this paper.
PETRA IV Study with Non-Interleaved Sextupole Scheme
Authors: Chao Hung-Chun , Gavalda X N , Brinkmann R 
Published: December 2019

Abstract
This study is an attempt to design PETRA IV storage ring, which is an upgrade from PETRA III toward a diffraction-limit synchrotron light source, based on the noninterleaved sextupole scheme. The lattice is constructed by mixing different types of cells. There are two basic building blocks. The double minus identity (DMI) cell dedicated for the chromaticity correction with non-interleaved sextupoles is tightly built up, while the combined function FODO cell with dispersion suppressors provides straights with small beta functions ideally for undulators. In addition, the hybrid section including a 10-m long super insertion device (ID) is custom-made to adapt to DESY’s current site plan. The beam dynamic behaviors are simulated and discussed.
Low-energy beam transport system for MESA
Authors: Matejcek C. , Aulenbacher K. , Friederich S. 
Published: December 2019

Abstract
An important part of the new accelerator MESA (Mainz Energy-recovering Superconducting Accelerator) is the low-energy beam transport system connecting the 100 keV electron source with the injector. The present setup includes the chopper and bunching system. The devices are of highest importance in order to achieve sufficient bunch compression, particularly at higher bunch charges and currents. With the circularly deflecting cavity of the chopper system it is possible to measure the longitudinal profile of the bunches upstream of the buncher, whereas downstream the longitudinal size will be measured by Smith-Purcell radiation. Based on experimental results obtained from this setup, we will discuss the beam parameters and compare them with simulations of the beamline.
Stimulated emission of THz coherent diffraction radiation in an optical cavity by a multibunch electron beam
Authors: Honda Y. , Aryshev A. , Kato R. , Miyajima T. , Obina T. , Shimada M. , Takai R. , Uchiyama T. , Yamamoto N. 
Published: December 2019

Abstract
Accelerator-based terahertz (THz) radiation has been expected to realize a highpower broad-band source. Employing a low-emittance and short-bunch electron beam at a high repetition rate, a scheme to resonantly excite optical cavity modes of THz spectrum range via coherent diffraction radiation has been proposed. The confocal cavity design is the special case that resonance conditions of all the eigen modes coincide, resulting in realizing broad-band excitation. But in general cases of non-confocal cavities, the resonance condition depends on the mode, and the resonance peak becomes wide and weak. We performed an experiment with a non-confocal cavity as a follow-up experiment of that we have done with a confocal cavity. The result confirmed that the confocal design is the key for a broad-band source.
The Beam-based Alignment Simulation and Preliminary Experiment at SXFEL
Authors: Zeng L , Feng C , Gu D , Deng H , Liu B , Zhao Z , Wang G 
Published: December 2019

Abstract
The Shanghai soft X-ray Free-electron Laser facility (SXFEL) is now serving as an experimental platform for fundamental free-electron laser (FEL) principal tests. This facility puts very tight tolerances on the straightness of the electron beam trajectory (within 5 μm). It is hard to achieve the required orbit due to the off-axis fields of the misaligned quadrupoles and undulator segments especially for the SXFEL driven by relatively low energy LINAC (840 MeV). The tight tolerances can be met through beam-based alignment (BBA) technique. In this paper, the BBA simulation and preliminary experiment results at SXFEL are presented. To further improve the electron beam trajectory by calculating the undulator misalignment, the feasibility of genetic algorithm (GA) based BBA has been studied.
Beam motion and photon flux dips during injection at the Taiwan Photon Source
Authors: Huang Chih-Hsien , Hsu Kuo-Tung , Chen Chia-Hsiang , Wu Chun-Yi , Liu Yi-Chih , Chang Ho-Ping , Fann Chyi-Shyan , Liao Chih-Yu , Cheng Yung-Sen , Chiu Pei-Chen , Hu Kuo-Hwa 
Published: December 2019

Abstract
The Taiwan photon source (TPS) is a 3 GeV synchrotron light source now in routine operation at the NSRRC. At the beginning of beam commissioning, significant photon flux dips could be observed at injection due to a blow-up of the beam size. To eliminate this transient effect, all four kickers were rematched. The leakage field was shielded and the induced current loops at vacuum chambers in the injection area were also eliminated. These efforts reduced the horizontal betatron oscillations and orbit distortions to around one-tenth. In order to decrease the recovery time of photon dips during injection, the operational chromaticity was reduced to improve incoherent effects. After all those improvements, the photon flux dips during injection dropped to 30 % and the recovery time to less than 1 msec.
A Novel Non-Linear Strip-Line Kicker Driven by Fast Pulser in Common Mode
Authors: Chen J. , Wang L. , Li Y. , Shi H. , Duan Z. , Wang N. , Huo L. , Wang G. 
Published: December 2019

Abstract
The next generation storage ring-based light sources adopt multi-bend achromat lattices to achieve a low emittance. The dynamic apertures of these machines are usually less than 10 mm so that the traditional pulsed local bump injection is difficult to achieve. Off-axis injection with a pulsed multipole or a non-linear kicker could be a viable solution which requires a moderate dynamic aperture of a few mm. In this paper, a novel non-linear kicker design is presented. Unlike pulsed sextupole or nonlinear kicker magnet, the nonlinear kicker we proposed is a traveling wave kicker with 2 strip-line electrodes driven by a nanosecond-level fast pulser in common mode. The disturbance to the stored beam is minimal since the perturbation is limited to the target bunch alone.
Status of the Horizon 2020 EuPRAXIA conceptual design study*
Authors: Weikum M K , Akhter T , Alesini D , Alexandrova A S , Anania M P , Andreev N E , Andriyash I A , Aschikhin A , Assmann R W , Audet T , Bacci A , Barna I F , Beaton A , Beck A , Beluze A , Bernhard A , Bielawski S , Bisesto F G , Brandi F , Brinkmann R , Bruendermann E , Büscher M , Bussmann M H , Bussolino G , Chance A , Chen M , Chiadroni E , Cianchi A , Clarke J A , Cole J , Couprie M E , Croia M , Cros B , Crump P A , Dattoli G , Del Dotto A , Delerue N , De Nicola S , Dias J M , Dorda U , Fedele R , Ferran Pousa A , Ferrario M , Filippi F , Fiore G , Fonseca R A , Galimberti M , Gallo A , Ghaith A , Giove D , Giribono A , Gizzi L A , Grüner F J , Habib A F , Haefner C , Heinemann T , Hidding B , Holzer B J , Hooker S M , Hosokai T , Huebner M , Irman A , Jafarinia F J , Jaroszynski D A , Joshi C , Kaluza M , Kando M , Karger O S , Karsch S , Khazanov E , Khikhlukha D , Knetsch A , Kocon D , Koester P , Kononenko O S , Korn G , Kostyukov I , Kruchinin K O , Labate L , Blanc C Le , Lechner C , Leemans W , Lehrach A , Li X , Libov V , Lifschitz A , Litvinenko V , Lu W , Lundh O , Maier A R , Malka V , Manahan G G , Mangles S P D , Marchetti B , Martinez de la Ossa A , Martins J L , Mason P D , Massimo F , Mathieu F , Maynard G , Mazzotta Z , Molodozhentsev A Y , Mostacci A , Mueller A - S , Murphy C D , Najmudin Z , Nghiem P A P , Nguyen F , Niknejadi P , Osterhoff J , Oumbarek Espinos D , Papadopoulos D N , Patrizi B , Petrillo V , Pocsai M A , Poder K , Pompili R , Pribyl L , Pugacheva D , Rajeev P P , Romeo S , Rossetti Conti M , Rossi A R , Rossmanith R , Roussel E , Sahai A A , Sarri G , Schaper L , Scherkl P , Schramm U , Schroeder C B , Scifo J , Serafini L , Sheng Z M , Siders C , Silva L O , Silva T , Simon C , Sinha U , Specka A , Streeter M J V , Svystun E N , Symes D , Szwaj C , Tauscher G E , Terzani D , Thompson N , Toci G , Tomassini P , Torres R , Ullmann D , Vaccarezza C , Vannini M , Vieira J M , Villa F , Wahlstrom C - G , Walczak R , Walker P A , Wang K , Welsch C P , Wiggins S M , Wolfenden J , Xia G , Yabashi M , Zhu J , Zigler A 
Published: December 2019

Abstract
The Horizon 2020 project EuPRAXIA (European Plasma Research Accelerator with eXcellence In Applications) is producing a conceptual design report for a highly compact and cost-effective European facility with multi-GeV electron beams accelerated using plasmas. EuPRAXIA will be set up as a distributed Open Innovation platform with two construction sites, one with a focus on beam-driven plasma acceleration (PWFA) and another site with a focus on laser-driven plasma acceleration (LWFA). User areas at both sites will provide access to free-electron laser pilot experiments, positron generation and acceleration, compact radiation sources, and test beams for high-energy physics detector development. Support centres in four different countries will complement the pan-European implementation of this infrastructure.
Beam Optics Study on FFA-MERIT Ring
Authors: Okita H. , Taniguchi A. , Kuriyama Y. , Uesugi T. , Ishi Y. , Mori Y , Muto M. , Ono Y. , Ikeda N. , Yonemura Y. , Sato A. , Kinsho M. , Miyake Y. , Yoshimoto M. , Okabe K. 
Published: December 2019

Abstract
An intense negative muon source MERIT (Multiplex Energy Recovery Internal Target) for the nuclear transformation to mitigate the long-lived fission products from nuclear plants has been proposed. For the purpose of proof-of-principle of MERIT scheme, a FFA(Fixed Field Alternating focusing) ring has been developed. The beam optics of the FFA-MERIT ring has been studied.
This work is partially supported by ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan).
SESRI 300MeV Proton and Heavy Ion Accelerator
Authors: Jiang H. P. , Liu J. L. , Hao H. F. , Zhang J. , Chen Q. M. , Chen W. , Han Z. N. , Zhang T. 
Published: December 2019

Abstract
The SESRI (Space Environment Simulation and Research Infrastructure) is the new national research infrastructure under construction at Harbin Institute of Technology (HIT) in China. This infrastructure is specifically built to simulate the space environment on the ground. The SESRI has kinds of accelerators, and the 300MeV proton and heavy ion accelerator is a major radiation source, which will supply 100-300MeV protons and 7-85MeV/u heavy ions for studying the interaction of high energy space particle radiation with material, device, module and biological entity. To meet above requirements, the facility adopts the combination of room temperature ECR (Electron Cyclotron Resonance) ion source, linac injector and synchrotron. The ion source is required to provide all stable nuclide beams from H+
2 to Bi. The linac injector supplies 1MeV/u heavy ion beams and 5MeV proton beam by using RFQ (Radio Frequency Quadrupole) and IH-DTL (Interdigital H-mode type Drift Tube Linac) linac structures. The synchrotron accelerates heavy ions up to 85MeV/u and proton beam 300MeV. And the 3rd integer resonance and RF-KO (RF-Knock-Out) method are adopted for slow extraction. The status of 300MeV proton and heavy ion accelerator design and construction works are briefly described below.
Numerical and experimental evaluation of the DQW crab cavity cryomodule thermal budget
Authors: Cano-Pleite E. , Brodzinski K. , Capatina O. , Carra F. 
Published: December 2019

Abstract
One of the key devices of the HL-LHC project are SRF Crab Cavities. A cryomodule with two Double Quarter Wave (DQW) crab cavities has been fabricated at CERN in 2017 and successfully tested with beam in the Super Proton Synchrotron (SPS) in 2018. The aim of this study is to present and compare the estimation of the thermal budget for the different components of the cryomodule, performed with numerical and semi-analytical methods, with the experimental measurements carried out on the cryomodule before its installation in the SPS.
The development programme of cathodes and electron guns for the Hollow Electron Lenses of the High Luminosity LHC project1
Authors: Perini D. , Gobbi G. , Shao W. , Feng J. , Zhang K. , Li Z. , Wang J. , Wang Y. , Liu W. , Yang Y. , Stancari G. , Crawford D. , Ruan J. , Valerio L. 
Published: December 2019

Abstract
The High Luminosity LHC project (HL-LHC) foresees the construction and installation of important new equipment to increase the performance of the LHC machine. The Hollow Electron Lens (HEL) is a promising system to control the beam halo. It improves the beam collimation system of the HL-LHC and mitigates possible equipment damage in case of failure scenarios from halo losses. The halo can store up to 30 MJ energy. The specifications for this new device are quite demanding. The source, an electron gun with an annular shaped cathode, has to deliver a current up to 5 A. This is five times higher than the current in the existing electron lenses in Fermi and Brookhaven national laboratories. This note describes the programme carried out to design and test high-perveance guns equipped with two types of high-performance scandate cathodes. The size of the final gun is now considerably smaller than the one of the first prototype, allowing a reduction of diameter and cost of the superconducting magnet system used to steer the electron beam. The tests carried out at FNAL, BVERI and BJUT demonstrated that the developed cathodes fulfil the specifications and can supply a 5 A fully Space Charge Limited (SCL) current.
Beam commissioning of the demonstrator setup for the superconducting continuous wave HIM/GSI-Linac
Authors: Miski-Oglu M , Aulenbacher K , Barth W , Basten M , Burandt C , Busch M , Conrad T , Dziuba F , Gettmann V , Heilmann M , Kuerzeder T , List J , Lauber S , Podlech H , Rubin A , Schnase A , Schwarz M , Yaramyshev S 
Published: December 2019

Abstract
During successful beam commissioning of the superconducting 15-gap Crossbar H-mode (CH) cavity at GSI Helmholtzzentrum für Schwerionenforschung heavy ions up to the design beam energy have been accelerated. The design acceleration gain of 3.5 MeV inside a length of less than 70 cm has been reached with full transmission for heavy ion beams of up to 1.5 pμA. The measured beam parameters confirm sufficient beam quality. The machine beam commissioning is a major milestone of the R&D for the superconducting heavy ion continuous wave linear accelerator HELIAC (HElmholtz LInear ACcelerator) of Helmholtz Institute Mainz (HIM) and GSI, developed in collaboration with IAP Goethe-University Frankfurt (GUF). The next step is the procurement and commissioning of the so called “Advanced Demonstrator” – the first of four cryomodules for the entire accelerator HELIAC. Results of further Demonstrator beam tests, as well as the status of the “Advanced demonstrator” project will be reported.
Towards the first beams from the ADIGE injector for the SPES Project
Authors: Galatà A , Roncolato C , Bisoffi G , Francescon P , Bellan L , Bermudez J , Bortolato D , Comunian M , Conte A , De Lazzari M , Gelain F , Marcato D , Miglioranza M , Moisio M F , Munaron E , Pavinato S , Pedretti D , Pisent A , Rossignoli M , Roetta M , Savarese G , Bellato M , Angot J , Bondoux D , Thuillier T , Andreev V. 
Published: December 2019

Abstract
The ADIGE (Acceleratore Di Ioni a Grande carica Esotici) injector of the SPES (Selective Production of Exotic Species) project is now in an advanced phase of installation. Its main components have been designed following particular needs of the project: first, an Electron Cyclotron Resonance (ECR)-based Charge Breeder (SPES-CB), to boost the charge states of the radioactive ions produced at SPES and allow their post-acceleration. Then, a stable 1+ source and a complete electrostatic beam line to characterize the SPES-CB. Finally, a unique Medium Resolution Mass Spectrometer (MRMS, R=1/1000), mounted on a high voltage platform downstream the SPES-CB, to clean the radioactive beam from the contaminants induced by the breeding stage. This contribution describes the status of the injector, in particular the installation of the platform housing the MRMS, the access and safety system adopted and the first beams to be extracted from the stable 1+ source.
The “Physics Beyond Colliders” Projects for the CERN M2 Beam
Authors: Banerjee D. , Bernhard J. , Brugger M. , Charitonidis N. , de Jesus V. , Gatignon L. , Gerbershagen A. , Montbarbon E. , Rae B. , Rosenthal M. , Van Dijk M.W.U. , Veit B.M. , D’Alessandro G.L. , Cholak S. 
Published: December 2019

Abstract
Physics Beyond Colliders is an exploratory study aimed at exploiting the full scientific potential of CERN’s accelerator complex up to 2040 and its scientific infrastructure through projects complementary to the existing and possible future colliders. Within the Conventional Beam Working Group (CBWG), several projects for the M2 beam line in the CERN North Area were proposed, such as a successor for the COMPASS experiment, a muon programme for NA64 dark sector physics, and the MuonE proposal aiming at investigating the hadronic contribution to the vacuum polarisation. We present integration and beam optics studies for 100 – 160 GeV/c muon beams as well as an outlook for improvements on hadron beams, which include RFseparated options and low-energy antiproton beams and radiation studies for high intensity beams. In addition, necessary beam instrumentation upgrades for beam particle identification and momentum measurements are discussed.
Implementation of CERN secondary beam lines T9 and T10 in BDSIM
Authors: D’Alessandro G , Boogert S T , Gibson S , Nevay L J , Shields W , Bernhard J , Gerbershagen A , Rosenthal M 
Published: December 2019

Abstract
CERN has a unique set of secondary beam lines, which deliver particles extracted from the PS and SPS accelerators after their interaction with a target material reaching energies up to 400 GeV. These beam lines provide a crucial contribution for test beam facilities, and host several fixed target experiments. A correct operation of the beam lines requires precise simulations of the beam optics and studies on the beam-matter interaction, radiation protection, beam equipment survival etc. BDSIM combines tracking studies with energy deposition and beam-matter interaction simulations within one software framework. This paper presents studies conducted on secondary beam lines with BDSIM for the beam lines T9 and T10. We report the tracking analysis and the energy deposition along the beam line. Tracking analysis validation is demonstrated via comparison to existing tracking codes.
Transverse profile shaping of a charged-particle beam using multipole magnets - Formation of hollow beams -
Authors: Yuri Yosuke , Fukuda Mitsuhiro , Yuyama Takahiro 
Published: December 2019

Abstract
The use of multipole magnets enables us to transform the transverse profile of a charged-particle beam into various ones that can never be formed through linear beam optics. To date, the formation of a large-area beam with a uniform transverse intensity distribution has been realized using octupole magnets for uniform beam irradiation. Here, we report the first demonstration of the hollow-beam formation using multipole magnets in a beam transport line. Results of beam-formation experiments and tracking simulations are shown. The hollow beam has a steep peak at the edge of the beam and thus has a high contrast between the edge peak and the intensity near the beam center.
New spiral beam screen design for the FCC-hh injection kicker magnet
Authors: Chmielinska A , Barnes M J 
Published: December 2019

Abstract
The injection kicker system for the Future Circular Collider (FCC-hh) must satisfy demanding requirements. To achieve low pulse ripple and fast field rise and fall times, the injection system will use ferrite loaded transmission line type magnets. The beam coupling impedance of the kicker magnets is crucial, as this can be a dominant contribution to beam instabilities. In addition, interaction of the high intensity beam with the real part of the longitudinal beam coupling impedance can result in high power deposition in the ferrite yoke. This gives a significant risk that the ferrite yoke will exceed its Curie temperature: hence, a suitable beam screen will be a critical feature. In this paper, we present a novel concept - a spiral beam screen. The fundamental advantage of the new design is a significant reduction of the maximum voltage induced on the screen conductors, thus decreased probability of electrical breakdown. In addition, the longitudinal beam coupling impedance is optimized to minimize power deposition in the magnet.
Modelling creep induced by internal stresses in freestanding submicron Cu film
Authors: Delannay Laurent , Lemoine Guerric , Coulombier Michaëel , Pardoen Thomas 
Published: December 2019

Abstract
In a lab-on-chip experiment, lithography and selective chemical etching are used to pattern microscopic tensile test samples within a thin metallic layer hosting large internal stresses. After partial release of the layer from the substrate on which it was deposited, the free-standing beam-like structures are stretched by the actuator to which they are connected. The lab-on-chip also comprises cantilever beams which shorten freely upon release from the substrate. Experimental observations of both the instantaneous and the delayed deformations in a 170 nm thick copper film were simulated using a theoretical model. The model properly reproduced the experiments only when accounting for both plasticity and significant kinematic hardening occurring already during the deposition of the polycristalline film. Once released from the substrate, cantilever beams contracted well beyond the elastic range because the amplitudes of back-stresses were sufficient to cause reverse plastic yielding. Large tensile stresses inside the actuated beams led to delayed uniform elongations (creep) exceeding 16%. Such values are much larger than the uniform strain of 5-6% that was observed in beams that underwent necking as soon as the film was released from the substrate, i.e. directly after etching of the sacrificial layer.