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

• Published in: Chinese physics C 2010-11, Vol.34 (11), p.1749-1753, Article 1749
• Main Author: 肖陈 何源 陆元荣 Yuri Batygin 尹苓 王志军 原有进 刘勇 常玮 杜小楠 王智 夏佳文
• Format: Article
• Language: English
• Subjects: 三维粒子; 初始结构; 合作计划; 直线加速器; 空间电荷
• ISSN: 1674-1137; 0254-3052; 2058-6132
• DOI: 10.1088/1674-1137/34/11/016

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,respectively.The beam dynamics in this RFQ have been studied using a three-dimensional Particle-In-Cell （PIC） code BEAMPATH.Simulation 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 regime.The 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.