Experimental study on helium optical electron polarimetry  

作　　者：丁海兵 庞文宁 刘义保 尚仁成 

机构地区：[1]Department of Physics, Tsinghua University, Beijing 100084, China

出　　处：《Chinese Physics B》2005年第12期2440-2443,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China （Grant No 10134010）.

摘　　要：Optical electron polarimetry is suitable for calibration of a spin-polarized electron source, especially for measurement of polarization of spin-polarized electron beam. In this paper, a new optical electron polarimeter is described, which is based on the circularly polarized He radiation induced by the bombarding of He atoms with spin-polarized electrons. The theoretical basis of the optical electron polarimetry and the structure of the optical electron polarimeter are discussed. The measurement of polarization of spin-polarized electrons produced from a new GaAs （100） spin-polarized electron source is carried out. The result of polarization of 30.8% for our spin-polarized electron source is obtained using the He optical electron polarimeter.Optical electron polarimetry is suitable for calibration of a spin-polarized electron source, especially for measurement of polarization of spin-polarized electron beam. In this paper, a new optical electron polarimeter is described, which is based on the circularly polarized He radiation induced by the bombarding of He atoms with spin-polarized electrons. The theoretical basis of the optical electron polarimetry and the structure of the optical electron polarimeter are discussed. The measurement of polarization of spin-polarized electrons produced from a new GaAs （100） spin-polarized electron source is carried out. The result of polarization of 30.8% for our spin-polarized electron source is obtained using the He optical electron polarimeter.

关 键 词：optical electron polarimeter spin-polarized electrons polanzation 

分 类 号：O431.2[机械工程—光学工程]