| 残余气体对LIA束流发射度的影响 |
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| 引用本文： | 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. |
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| 作者姓名： | 代志勇 高峰 章林文 邓建军 丁伯南 |
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| 作者单位： | 1. 中国科学院 高能物理研究所，北京 100039；2．中国工程物理研究院 流体物理研究所，四川 绵阳 621900 |
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| 基金项目： | 国防科技基础研究基金资助课题 |
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| 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。
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| 关 键 词： | 均方根包络方程 残余气体散射 发射度增长 |
| 文章编号： | 1001-4322(2004)12-1618-03 |
| 收稿时间： | 2004/2/6 |
| 修稿时间： | 2004年2月6日 |
Scattering effects of residual gas and RMS emittance growth in Dragon-I LIA |
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| DAI Zhi-yong.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. |
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| Authors: | DAI Zhi-yong |
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| Institution: | 1. Institute of High Energy Physics, the Chinese Academy of Sciences, P. O. Box 918, Beijing 100039, China;2. Institute of Fluid Physics, CAEP, P. O. Box 919-106, Mianyang 621900, China |
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| 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. |
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| Keywords: | RMS envelope equation Scattering effects of residual gas Emittance growth |
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