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高能电子和物质相互作用是一个级联簇射 (shower)物理过程。 NSRL电子储存环 (HLS)束流损失监测系统利用这一原理 ,通过探测束流损失电子在储存环真空室外表面产生的 shower电子 ,给出束流损失的有关信息。本文利用 Monte- Carlo方法 ,采用 EGS4软件包 ,对束流损失电子与真空室壁相互作用的过程进行模拟 ,给出了真空室外表面 shower电子的分布特点 :(1) shower电子在真空室外表面是前冲性很强的粒子 ;(2 )在垂直方向的分布是比较窄的对称分布 ,对束流损失探测器的安装有一定的要求 ;(3)打在真空室内侧壁上的电子及其产生的 shower电子有机会反射到外侧壁 ,并进一步发生 shower过程 ,但其影响会低两个量级以上 ;(4) shower电子在真空室外表面上的分布 ,外侧峰位要比内侧峰位位置在束流方向上后移
High-energy electron-matter interactions are a cascade shower physics. Using this principle, the NSRL Electronic Storage Ring (HLS) Beam Loss Monitoring System uses this principle to provide information about the beam losses by detecting the shower electrons generated by the electron beam on the outer surface of the storage chamber vacuum chamber. In this paper, the Monte-Carlo method was used to simulate the interaction between beam-loss electrons and vacuum chamber wall using EGS4 software package. The distribution characteristics of shower electrons on the outer surface of the vacuum chamber were given as follows: (1) (2) the distribution in the vertical direction is relatively narrow symmetrical distribution of the beam loss detector has certain requirements; (3) playing in the vacuum chamber on the inner wall of the electron and its The generated shower electrons have the opportunity to reflect to the outer wall and further the shower process occurs but the influence is lower than two orders of magnitude. (4) The distribution of the shower electrons on the outer surface of the vacuum chamber is higher than the inner peak position Move backward in the direction of the beam