Design,construction,and offline calibration of ARPolar prototype for SXFEL facility  

作　　者：Zipeng Liu Bangjie Deng Qingmin Zhang Haixiao Deng Bo Liu 

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]School of Nuclear Science and Technology,Xi'an Jiaotong University,Xi'an 710049,Shaanxi,China [4]Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China

出　　处：《Radiation Detection Technology and Methods》2022年第2期214-226,共13页辐射探测技术与方法（英文）

基　　金：supported by the National Key Research and Development Program of China(2018YFE0103100);the National Natural Science Foundation of China(12125508,11935020);Program of Shanghai Academic/Technology Research Leader(21XD1404100);Shanghai Pilot Program for Basic Research–Chinese Academy of Science,Shanghai Branch(JCYJ-SHFY-2021-010)

摘　　要：Purpose The polarization characteristics of photoelectrons are critical for free-electron laser(FEL)experiments.Several FEL facilities have operated an eTOF-alike polarimeter based on the angular distribution of photoelectrons.The purpose of this paper is to introduce the design,construction and offline test of the prototype angular resolved polarimeter(ARPolar-CORE)for the Shanghai Soft X-ray Facility(SXFEL).This paper describes the overall design of this instrument,covering the main chamber,detector assemblies,and electronics.Methods To validate the performance of the instrument,the detectors and electronics were tested offline and calibrated.Moreover,based on the measured pulse shape obtained from the offline tests,a comprehensive numerical analysis is presented to evaluate the performance of the instrument.Results and conclusion The results show that the fluctuation in the electron charges is less than 0.8%under the SXFEL working conditions,corresponding to a linear polarity of 0.988±0.0175 for linearly and horizontally polarized FEL pulses.The analysis also indicates that a 0.16 eV mean square error is fully feasible for 645 eV FEL pulses.

关 键 词：Free electron laser eTOF-based polarimeter CALIBRATION ELECTRONICS 

分 类 号：TN248[电子电信—物理电子学]