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残余气体对LIA束流发射度的影响
Scattering effects of residual gas and RMS emittance growth in Dragon-I LIA
摘要
把残余气体散射作为一种各向同性微扰力引入轴对称直流带电粒子束的均方根包络方程,从中得到了气体散射作用导致束流发射度增长的表达式.根据理论研究结果,结合"神龙一号"加速器束流传输系统的设计参数,计算了气体散射作用引起的发射度增长.结果表明,在束流传输系统的真空度高于3×10-4Pa时,残余分子的散射作用可以忽略不计.5×10-4Pa的真空指标是可以接受的.讨论了抑制残余气体分子散射作用的措施,在螺线管线圈能力许可的情况下,采用强磁场小半径传输有利于抑制残余气体散射导致的发射度增长.
Abstract
In this paper, the multiple scattering effects of residual gas as isotropic disturbing forces, are introduced into the RMS envelope equation of cylindrically symmetric DC electron beams, so that the expression of emittance growth due to the scattering is obtained. Referring to the design parameters of beam transport system of Dragon-I LIA, the emittance growth is calculated. The result shows that the emittance growth due to gas scattering could be neglected if the pressure of vacuum tube is less than 3×10-4 Pa. And the measures to restrain the scattering effects are discussed.
中图分类号：TL506
所属栏目：粒子束及加速器技术
基金项目：国防科技基础研究基金资助课题
收稿日期：2004-02-06
修改稿日期：2004-09-17
网络出版日期：2004-12-15
作者单位 点击查看
高峰：中国工程物理研究院,流体物理研究所,四川,绵阳,621900
章林文：中国工程物理研究院,流体物理研究所,四川,绵阳,621900
邓建军：中国工程物理研究院,流体物理研究所,四川,绵阳,621900
丁伯南：中国工程物理研究院,流体物理研究所,四川,绵阳,621900
备注：代志勇(1968-),男,副研究员,从事核技术及其应用研究.
【1】王华岑,张开志,文龙,等.直线感应加速器加速腔物理设计与研究[J].强激光与粒子束,1996,8(3):314-319.
Wang H C,Zhang K Z,Wen L,et al.Physical design study of linear induction accelerator cell.High Power Laser and Particle Beams,1996,8(3) :314-319.
【2】Lee E P.Cooper R K.General envelope equation for cylindrically symmetric charged-particle beams[J].Particle Accelerators,1976,7:83-95.
【3】Lauer E J.Universal curves for predicting equilibrium radii of relativistic electron beams including the effects of attractive self force,external Bz,initial beam quality and scattering in the gas entry foil[R].Livermore CA:Lawrence Livermore Laboratory,1975.
【4】日本真空技术株式会社.卢永铭,刘立等译.真空手册[M].北京:原子能出版社出版.1986.
ULVAC JAPAN LTD.Vacuum Manual.Beijing:Atomic Enengy Press,1986.
引用该论文
DAI Zhi-yong,GAO Feng,ZHANG Lin-wen,DENG Jian-jun,DING Bo-nan. Scattering effects of residual gas and RMS emittance growth in Dragon-I LIA[J]. High Power Laser and Particle Beams, 2004, 16(12): 1618-1620
代志勇,高峰,章林文,邓建军,丁伯南. 残余气体对LIA束流发射度的影响[J]. 强激光与粒子束, 2004, 16(12): 1618-1620
