A fast white-beam shutter for hard x-ray topography at beamline 1-BM of the Advanced Photon Source

17th Pan-American Synchrotron Radiation Instrumentation Conference

Kujala, Naresh^1 ; Erdmann, Mark^1 ; Goetze, Kurt^1 ; Sullivan, Joseph^1 ; Huang, Xianrong^1 ; Macrander, Albert^1

Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, United States^1

关键词: Advanced photon source;    Associated electronics;    Epitaxial materials;    Motion controller;    Synchrotron source;    Voice coil actuators;    X-ray photon fluxes;    X-ray topography;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/493/1/012007/pdf
DOI  :  10.1088/1742-6596/493/1/012007

来源: IOP

【 摘 要 】

Beamline 1-BM at the Advanced Photon Source (APS) delivers a white beam from a bending magnet with very intense x-ray photon flux. One important application of this beamline is white-beam x-ray topography imaging for crystal-based x-ray optics development and for industrial characterization of single crystals and epitaxial materials. Due to the intense photon flux from the third-generation synchrotron source of the APS, the exposure time of the imaging process should be accurately controlled down to the millisecond level. For this purpose we have designed and implemented a fast shutter that is vacuum compatible to 10-8torr. The aperture is a copper block with a 70 mm horizontal and 5 mm vertical opening and is water cooled. The aperture is moved vertically up and down by means of a linear voice-coil actuator. The aperture's position is controlled using encoder feedback in a servo loop running on an industrial motion controller. A shutter opening response time of 32 milliseconds was measured. In this paper, we describe the shutter mechanics and its associated electronics installed at the 1-BM, and we report example white-beam topographs of diamond type IIa crystals.