Measurement of high energy electron beam using diamond detector

在x射线自由电子激光装置中，如果用电子束的光晕部分照射插入装置的永磁体，会使永磁体消磁。为了防止这种情况的发生，我们研制了一种联锁监测仪，即波束晕监测仪，并将其投入了实际应用。该监测仪配备辐射硬度高的金刚石探测器，置于真空管道中，可直接测量电子束光晕部分的强度，灵敏度高。通过引入射频指来控制电子束的尾流场，提高了电子束的高频特性。

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.