A system and method for active triggering of x-ray free electron laser events

Abstract

The invention provides an active triggering system for X-ray free electron laser events. The system includes two sets of single-pulse position detectors, a set of sample point position detectors, a free electron laser synchronous trigger system, a multi-channel high-speed data acquisition system, and a position analysis system. And event active trigger system, experimental trigger and detection system, pump laser and auxiliary collimated laser, attenuator and focusing mirror. The invention also provides a method for actively triggering X-ray free electron laser events. The invention can improve the experiment efficiency and ensure the success of the experiment.

Description

technical field [0001] The invention relates to an active triggering system for X-ray free electron laser events and a triggering method using the system. Background technique [0002] X-ray free-electron laser (XFEL) has the characteristics of high brightness, high coherence, and ultrashort pulse, and is a powerful tool for basic scientific research. But the X-ray free electron laser also has some shortcomings that need to be solved. The most important thing is that the X-ray free electron laser device is very long, with a total length of several kilometers from the accelerator to the experimental station. For example, the Shanghai high repetition frequency hard X-ray free electron laser has a total length of 3.1 kilometers, and the beamline alone is 1.2 kilometers long. At this time, the stability of the entire beamline optical components will greatly affect the position of the beam reaching the experimental station. At the same time, the X-ray free electron laser is limi...

AI Technical Summary

Problems solved by technology

But the X-ray free electron laser also has some shortcomings that need to be solved. The most important thing is that the X-ray free electron laser device is very long, with a total length of several kilometers from the accelerator to the experimental station. For example, the Shanghai high repetition frequency hard X-ray free electron laser has a total length of 3.1 kilometers, the beamline alone is 1.2 kilometers long

At this time, the stability of the entire beamline optical components will greatly affect the position of the beam reaching the experimental station. At the same time, the X-ray free electron laser is limited by the principle of light emission and will also generate about 10% instability from the light source.

However, some experiments have very high requirements on the stability of the beam position. For example, some pump experiments require the X-ray free electron laser and the pump laser to be incident on the same position, and there is no very good way to judge whether they are incident on the same position at the experimental station. Thus affecting the experimental results; some experimental pump lasers have a very low repetition rate in order to achieve high power density such as hundreds of petawatts, and high-power pump lasers are very precious at this time

If the position stability of the X-ray free electron laser cannot be effectively guaranteed, the experiment will be very difficult

Images