New mounting mechanism for cryogenically cooled thin crystal x-ray optics in high brightness high repetition rate free-electron laser applications

Zhengxian Qu; Valery Borzenets; Guanqun Zhou; Yanbao Ma; Juhao Wu

doi:10.1063/5.0052764

New mounting mechanism for cryogenically cooled thin crystal x-ray optics in high brightness high repetition rate free-electron laser applications

Rev Sci Instrum. 2021 Aug 1;92(8):083904. doi: 10.1063/5.0052764.

Authors

Zhengxian Qu¹, Valery Borzenets², Guanqun Zhou¹, Yanbao Ma³, Juhao Wu¹

Affiliations

¹ SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
² Stanford Synchrotron Radiation Lightsource, SLAC National Acceleration Laboratory, Menlo Park, California 94025, USA.
³ Department of Mechanical Engineering, University of California Merced, Merced, California 95343, USA.

PMID: 34470424
DOI: 10.1063/5.0052764

Abstract

We present a new mounting design for thin crystal optics with cryogenic cooling compatibility. We design a crystal geometry with two symmetric strain-relief cuts to mitigate the distortion from mounting. We propose to sputter gold onto the crystal and the holder to ensure excellent thermal contact and sufficient mechanical bonding. The system is analyzed and verified by finite element analysis to have an acceptable level of strain due to mounting. The thermal performance of this mounting scheme is validated in an example cryogenic cooling system and the results indicate a tolerance of power density up to ∼1 kW/mm².