High-precision X-ray polarimeter based on channel-cut crystals  

作　　者：Shang-Yu Si Zhong-Liang Li Wen-Hong Jia Lian Xue Hong-Xin Luo Jian-Cai Xu Bai-Fei Shen Lin-Gang Zhang Liang-Liang Ji Yu-Xin Leng Ren-Zhong Tai 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China [4]Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China

出　　处：《Nuclear Science and Techniques》2024年第3期30-39,共10页核技术（英文）

基　　金：supported by the Shanghai Municipal Science and Technology Major Project(No.2017SHZDZX02);the National Natural Science Foundation of China(No.12205360);the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.2018297)。

摘　　要：We report on using synthetic silicon for a high-precision X-ray polarimeter comprising a polarizer and an analyzer,each based on a monolithic channel-cut crystal used at multiple Brewster reflections with a Bragg angle very close to 45°.Experiments were performed at the BL09B bending magnet beamline of the Shanghai Synchrotron Radiation Facility using a Si(800)crystal at an X-ray energy of 12.914 keV.A polarization purity of 8.4×10^(-9)was measured.This result is encouraging,as the measured polarization purity is the best-reported value for the bending magnet source.Notably,this is the firstly systematic study on the hard X-ray polarimeter in China,which is crucial for exploring new physics,such as verifying vacuum birefringence.

关 键 词：X-ray polarimeter Vacuum birefringence Synchrotron radiation Channel-cut crystal 

分 类 号：O434.19[机械工程—光学工程] O436.3[理学—光学]