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Emittance measurement & optimization for the photocathode RF gun with laser profile shaping

Chinese Physics C 2010年第5期34卷 584-588页

作者：刘圣广 Masafumi Fukuda Sakae Araki Nobuhiro Terunuma Junji Urakawa Institute of High Energy Physics Chinese Academy of Sciences High Energy Accelerator Research Organization 1-1OhoTsukubaIbaraki305-0801Japan

The laser Undulator Compact X-ray source （LUCX） is a test bench for a compact high brightness X-ray generator, based on inverse Compton Scattering at KEK, which requires high intensity multi-bunch trains with low transverse emittance. A photocathode RF gun with emittance compensation solenoid is used as an electron source. Much endeavor has been made to increase the beam intensity in the multi-bunch trains. The cavity of the RF gun is tuned into an unbalanced field in order to reduce space charge effects, so that the field gradient on the cathode surface is relatively higher when the forward RF power into gun cavity is not high enough. A laser profile shaper is employed to convert the driving laser profile from Gaussian into uniform. In this research we seek to find the optimized operational conditions for the decrease of the transverse emittance. With the uniform driving laser and the unbalanced RF gun, the RMS transverse emittance of a 1 nC bunch has been improved effectively from 5.46 πmm·mrad to 3.66 πmm·mrad.

关键词： laser shaping space charge effect emittance photocathode RF gun

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Prompt acceleration of a μ^(+) beam in a toroidal wakefield driven by a shaped steep-rising-front Laguerre–Gaussian laser pulse

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Plasma Science and Technology 2022年第5期24卷 226-236页

作者： Xiaonan WANG Xiaofei LAN Yongsheng HUANG Youge JIANG Chunlei ZHANG Hao ZHANG Tongpu YU School of Physics and Astronomy China West Normal UniversityNanchong 637009People's Republic of China Key Laboratory of Beam Technology of Ministry of Education Beijing Normal UniversityBeijing 100875People's Republic of China School of Science Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107People's Republic of China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049People's Republic of China Department of Physics National University of Defense TechnologyChangsha 410073People's Republic of China

Recent experimental data for anomalous magnetic moments strongly indicates the existence of new physics beyond the Standard *** μ^(+) bunches are relevant to μ^(+) rare decay,spin rotation,resonance and relaxation(μSR)technology,future muon colliders,and neutrino *** this paper,we propose prompt μ^(+) acceleration in a nonlinear toroidal wakefield driven by a shaped steep-rising-front Laguerre–Gaussian(LG)laser *** analytical model is described,which shows that a μ^(+) beam can be focused by an electron cylinder at the centerline of a toroidal bubble and accelerated by the front part of the longitudinal wakefield.A shaped LG laser with a short rise time can push plasma electrons,generating a higher-density electron sheath at the front of the bubble,which can enhance the acceleration *** acceleration field driven by the shaped steep-rising-front LG laser pulse is about four times greater than that driven by a normal LG laser *** simulation results show that a 300 MeV μ^(+) bunch can be accelerated to 2 GeV and its transverse size is focused from an initial value of w_(0)=5μm to w=2μm in the toroidal bubble driven by the shaped steep-rising-front LG laser pulse with a normalized amplitude of a=22.

关键词： plasma wakefield acceleration muon source laser shaping

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Overview of SwissFEL dual-photocathode laser capabilities and perspectives for exotic FEL modes

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High Power laser Science and Engineering 2021年第4期9卷 46-65页

作者： S.Bettoni A.Cavalieri A.Dax E.Divall C.P.Hauri S.Hunziker M.Huppert M.Kaiser M.Paraliev C.Sydlo C.Vicario A.Trisorio Paul Scherrer Institut 5232 VilligenSwitzerland University of Bern 3012 BernSwitzerland TRUMPF Switzerland 7214 GruschSwitzerland HUBER+SUHNER AG 9100 HerisauSwitzerland

SwissFEL is a compact,high-brilliance,soft and hard X-ray free electron laser(FEL)facility that started user operation in *** facility is composed of two parallel beam lines seeded by a common linear accelerator(LINAC),and a two-bunch *** the injector,an innovative dual-photocathode laser scheme has been developed based on state-of-the-art ytterbium femtosecond laser *** this paper,we describe the performance of the Swiss FEL photocathode drive lasers(PCDLs),the pulse-shaping capabilities as well as the versatility of the systems,which allow many different modes of operation of Swiss *** full control over the Swiss FEL electron bunch properties via the unique architecture of the PCDLs will enable in the future the advent of more-advanced FEL modes;these modes include,but are not restricted to,the generation of single or trains of sub-femtosecond FEL pulses,multi-color FEL and finally,the generation of fully coherent X-ray pulses via laser-based seeding.

关键词： free electron laser femtosecond laser laser shaping photocathode lasers

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