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)
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 photo...