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电子储存环中损失的束流电子 ,在撞击真空室壁时 ,引起“电子 -γ -电子”簇射 ,在撞击点的下游 ,真空室的外表面形成次级电子 (shower电子 )的分布。通过探测这些shower电子 ,可以知道上游某处的束流损失状况。“合肥国家同步辐射实验室加速器二期工程”中的电子储存环束流损失监测系统 ,就是利用了这个原理。在分析了原有加速器束流损失监测系统的缺陷并对国际上各大型加速器进行了调研的基础上 ,对该系统中的探测器选型、探测器安装位置的选择以及系统的整体结构等物理问题作了阐述
The electron beam that is lost in the electron storage ring causes “electron-γ-electron” showering when it impinges on the wall of the vacuum chamber. A shower electron is formed on the outer surface of the vacuum chamber downstream of the point of impingement. By probing these shower electrons, one can know the beam loss somewhere upstream. “Hefei National Synchrotron Radiation Laboratory Accelerator Phase II” in the electronic storage ring beam loss monitoring system, is the use of this principle. Based on the analysis of the defects of the existing accelerator beam current loss monitoring system and the investigation of various large accelerators in the world, the selection of the detector type, the installation position of the detector, and the overall structure of the system, etc. The problem is explained