Measurement of high energy electron beam using diamond detector

在X射线自由电子激光装置中，插入器件的永磁体受到电子束晕束部分的辐照，会产生消磁现象。为了防止这种情况，新开发了一种联锁监视器，即束晕监视器，并将其投入实际使用。该监视器在真空管道中配备有具有高辐射硬度的金刚石探测器，并且可以直接测量电子束的晕圈部分的强度，具有高灵敏度。通过引入射频指可以控制电子束尾流场，改善高频特性。

In the X-ray free electron laser facilities, if permanent magnets of insertion devices are irradiated with halo part of electron beam, they may de degaussed. In order to prevent this, an interlock monitor, which is a beam halo monitor, was newly developed, and it was led to practical use. This monitor is equipped with diamond detectors, which has high radiation hardness, in a vacuum duct, and can directly measure intensity of the halo part of the electron beam with high sensitivity. Wake field of electron beam can be controlled by introducing RF fingers, and high-frequency property was improved.