Dynamic monitoring of grating angle at the National Synchrotron Light Source

Shinan Qian; Dario Arena; Joseph Dvorak; Kun Qian

doi:10.1117/1.3265548

Abstract

We present a dynamic monitoring method and monitoring system of grating angle, referred to as the Precise Angle Monitor (PAM), at U4B, a soft x-ray spherical grating monochromator (SGM) beam line at the National Synchrotron Light Source (NSLS). In an SGM, a photon energy scan is accomplished by rotating the grating angle precisely. After several decades of service, the monochromator at U4B developed instabilities that severely impacted the experimental program. Over several hours, either the spectral shape experienced distortions or the spectral peak shifted. In order to directly monitor the grating motion during scans, the optical head of a portable long trace profiler (PTLTP) was installed on U4B as the PAM. We find that the grating rotational motion is not ideal: (1) the scan steps are not smooth and there are high-frequency step angle errors; (2) there is also a low-frequency angle error; and (3) an unstable thermal expansion produces extra rotational error. Measurements of dynamic monitoring are presented, including grating rotation repeatability and thermal instability. The results illustrate the utility of dynamic monitoring of monochromator motion during actual operation.

Citation Download Citation

Shinan Qian, Shinan Qian, Dario Arena, Dario Arena, Joseph Dvorak, Joseph Dvorak, Kun Qian, Kun Qian, } "Dynamic monitoring of grating angle at the National Synchrotron Light Source," Optical Engineering 48(11), 113603 (1 November 2009). https://doi.org/10.1117/1.3265548 . Submission:

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