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A particle-in-cell mode beam dynamics simulation of medium energy beam transport for the SSC-Linac

Chinese Physics C 2012年第1期36卷 84-90页

作者：肖陈何源原有进陆元荣刘勇王志军杜小楠姚庆高刘戈徐孟鑫贺守波夏佳文 Institute of modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Key Laboratory of Heavy Ion Physics Ministry of Education Peking University School of Nuclear Science and Technology Lanzhou University

A new linear accelerator system,called the SSC-Linac injector,is being designed at HIRFL （the heavy ion research facility of Lanzhou）.As part of the SSC-Linac,the medium energy beam transport （MEBT） consists of seven magnetic quadrupoles,a re-buncher and a diagnose *** total length of this segment is about 1.75 *** beam dynamics simulation in MEBT has been studied using the TRACK 3D particle-in-cell code,and the simulation result shows that the beam accelerated from the radio frequency quadrupole （RFQ） matches well with the acceptance of the following drift tube linac （DTL） in both the transverse and longitudinal phase spaces,and that most of the particles can be captured by the final sector focusing cyclotron for further *** longitudinal emittance of the RFQ and the longitudinal acceptance of the DTL was calculated in detail,and a multi-particle beam dynamics simulation from the ion source to the end of the DTL was done to verify the original design.

关键词： SSC-Linac MEBT pic mode acceptance re-buncher

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Particle-in-cell mode beam dynamics simulation of the low energy beam transport for the SSC-linac injector

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Chinese Physics C 2011年第5期35卷 500-504页

作者： XIAO Chen HE Yuan YUAN You-Jin YAO Qing-Gao WANG Zhi-Jun CHANG Wei LIU Yong XIA Jia-Wen Institute of modern Physics Chinese Academy of Sciences Lanzhou 730000 China Graduate University of Chinese Academy of Sciences Beijing 100049 China The School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China

A new SSC-linac system （injector into separated sector cyclotron） is being designed in the HIRFL （heavy ion research facility of Lanzhou）. As part of SSC-Linac, the LEBT （low energy beam transport） consists of seven solenoids, four quadrupoles, a bending magnet and an extra multi-harmonic buncher. The total length of this segment is about 7 meters. The beam dynamics in this LEBT has been studied using three-dimensional pic （particle-in-cell） code BEAMPATH. The simulation results show that the continuous beam from the ion source is first well analyzed by a charge-to-mass selection system, and the beam of the selected charge-to-mass ratio is then efficiently pre-bunched by a multi-harmonic buncher and optimally matched into the RFQ （radio frequency quadrupole） for further acceleration. The principles and effects of the solenoid collimation channel are discussed, and it could limit the beam emittance by changing the aperture size.

关键词： SSC-linac LEBT pic mode optimal injection collimation

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A Particle-in-cell scheme of the RFQ in the SSC-Linac

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Chinese Physics C 2010年第11期34卷 1749-1753页

作者：肖陈何源陆元荣 Yuri Batygin 尹苓玉志军原有进刘勇常玮杜小楠王智夏佳文 Graduate University of Chinese Academy of Sciences Institute of modern Physics Chinese Academy of Sciences Key Laboratory of Heavy Ion Physics Ministry of Education Los Alamos National Laboratory Los AlamosNM87545USA The School of Nuclear Science and Technology Lanzhou University

A 52 MHz Radio Frequency Quadrupole （RFQ） linear accelerator （linac） is designed to serve as an initial structure for the SSC-Linac system （injector into Separated Sector Cyclotron）.The designed injection and output energy are 3.5 keV/u and 143 keV/u,*** beam dynamics in this RFQ have been studied using a three-dimensional Particle-In-Cell （pic） code *** results show that this RFQ structure is characterized by stable values of beam transmission effciency （at least 95%） for both zerocurrent mode and the space charge dominated *** beam accelerated in the RFQ has good quality in both transverse and longitudinal directions,and could easily be accepted by Drift Tube Linac （DTL）.The effect of the vane error and that of the space charge on the beam parameters have been studied as well to define the engineering tolerance for RFQ vane machining and alignment.

关键词： RFQ pic mode parameters sweep analysis manufacturing error space charge effect

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