Monochromator Stabilization System at SPring-8

A monochromator stabilization system with a semi‐automatic tuning procedure has been developed. The system comprises an X‐ray beam position/intensity monitor, a control electronics unit, a computer program that operates on a personal computer or workstation, a piezo translator attached to the first crystal of a double crystal monochromator, and a phase‐sensitive detector as an optional component. The system suppressed the fluctuations of the photon beam intensity and the beam position by ∼0.1% and ∼1 μm, respectively, at the sample locations in the beamlines of SPring‐8 with a frequency of less than 10 Hz. The system with the phase‐sensitive detector holds the peak of the rocking curve of the double crystal monochromator, which is effective in reducing the time required to perform the energy scan measurement.