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An electron beam detector for the FLASH II beam dump

机译：用于FLASH II束流收集器的电子束检测器

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摘要

After the generation of the laser light, a dipole deflects the highly energetic electron beam of FLASH (Free Electron Laser Hamburg) into a dump. A detector is developed to monitor the position, dimensions and profile of the electron beam. Scintillation light is emitted due to the electrons hitting a luminescent screen located in front of the dump aperture. This light is guided by an optical system external to the vacuum to a CCD camera for optical analysis of the generated image. In this paper the layouts of two different optical systems are presented, both of which will be redundantly installed at FLASH Ⅱ. The conventional lens-mirror-arrangement, consisting of three single collecting lenses, two mirrors and a zoom lens, is supposed to have a theoretical resolution of 0.25 mm. The second optical system is based on radiation-hard optical fibres. For the latter it is planned to test the impact of radiation on the optical qualities of the bundle by installing it into a "radioactive hot spot" at the bunch compressor in the FLASH accelerator. This test setup will also be presented.
机译：产生激光之后，偶极子将FLASH（自由电子汉堡）的高能电子束偏转到垃圾堆中。开发了一种检测器来监视电子束的位置，尺寸和轮廓。由于电子撞击位于排放孔前面的荧光屏，因此发出了闪烁光。该光由真空外部的光学系统引导至CCD摄像机，以对生成的图像进行光学分析。本文介绍了两种不同的光学系统的布局，这两种光学系统都将冗余安装在FLASHⅡ上。由三个单聚光镜，两个反光镜和一个变焦镜组成的常规镜头镜装置的理论分辨率假定为0.25 mm。第二光学系统是基于辐射坚硬的光纤。对于后者，计划通过将其安装到FLASH加速器中束式压缩机的“放射性热点”中，测试辐射对束的光学质量的影响。该测试设置也将介绍。

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