北京同步辐射1W2B生物大分子束线双丝型BPM实时跟踪监测系统

同步辐射光束位置稳定性对光束强度至关重要,直接会影响到实验数据的质量,因此需要在实验过程中对光束位置进行实时监测.在同步辐射光束线上一般会使用双丝型的光束位置监测器(beam position monitor,BPM)扫描光束,获得光束的截面分布,同时在固定位置的双丝会对光束位置进行静态的实时监测.但是这种监测方式对于入射光束分布有特殊的要求,当光束较大地偏离原有位置时会对双丝BPM造成损伤的危险.北京同步辐射1W2B生物大分子实验站通过采用双丝型BPM实时动态跟踪监测方式,有效地解决了常规监测方式带来的光束分布和光敏丝损伤问题,为实验光束的稳定性研究提供了基础.

Dynamic monitoring system with double-wire BPM of the macromolecular crystallography beamline 1W2B at BSRF

The stability of the synchrotron radiation(SR) beam’s position is essential to beam flux,and it will also directly affect the quality of the experiment data.It is therefore necessary to monitor the beam position in real-time during the whole experiment.The double-wire type BPM(beam position monitor) is normally used to scan the beam profile and it can also monitor the beam position in a fixed position.But this kind of monitoring demands a special beam distribution because when the beam greatly deviates from the original position,the double-wire BPM might face the threat of damage.By means of the dynamic real-time tracking mode,1W2B macromolecular beamline of BSRF(Beijing Synchrotron Radiation Facility) has solved the problems of the routine monitoring mode,such as beam distribution and the damage of the photosensitive wires,thus providing a basis for the study of beam stability.