In-situ optical pumping for polarizing 3He neutron spin filters at the China Spallation Neutron Source  

作　　者：Junpei Zhang Chuyi Huang Zecong Qin Fan Ye Syed Mohd Amir Ahmed Salman Yuchen Dong Long Tian Zachary Norris Buck Wolfgang Kreuzpaintner Matthew Musgrave Xin Qi Tianhao Wang Xin Tong 

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]Spallation Neutron Source Science Center,Dongguan 523803,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [5]National Institute of Standards and Technology,Boulder 80305,USA

出　　处：《Science China(Physics,Mechanics & Astronomy)》2022年第4期49-54,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2020YFA0406000);National Natural Science Foundation of China(Grant No.11875265);Scientific Instrument Developing Project of the Chinese Academy of Sciences(Grant No.ZDKYYQ20190004);Guangdong Basic and Applied Basic Research Foundation(Grant No.2019B1515120079);Dongguan Introduction Program of Leading Innovative and Entrepreneurial Talents(Grant No.20191122)。

摘　　要：In this paper,we present the performance of a recently developed in-situ spin-exchange optically pumped^(3)He-neutron spin filter system at the China Spallation Neutron Source(CSNS).The system achieved a^(3)He polarization of over 74%at the beamline BL-20.Analysis of neutron transmission experiment results reveals a neutron polarization of>90%and an average transmission of 27%for 2.2Åneutrons,which were maintained for a duration of 120 h of beam time.To the best of our knowledge,this is the first in-situ hyperpolarized^(3)He system incorporated on a neutron beamline in China.This technology is expected to provide stable,wide-angle,and highly polarized neutrons at the CSNS for materials research and fundamental neutron physics.

关 键 词：spin-exchange optical pumping ^(3)He polarization neutron spin filter neutron polarization 

分 类 号：O571.53[理学—粒子物理与原子核物理]