A simulation study of a windowless gas-stripping room in an E//B neutral particle analyzer  

作　　者：Yuan Luo Wei-Ping Lin Pei-Pei Ren Guo-Feng Qu Jing-Jun Zhu Xing-Quan Liu Xiao-Bing Luo Zhu An Roy Wada Lin-Ge Zang Yu-Fan Qu Zhong-Bing Shi 

机构地区：[1]Key Laboratory of Radiation Physics and Technology of the Ministry of Education,Institute of Nuclear Science and Technology,Sichuan University,Chengdu 610064,China [2]Cyclotron Institute,Texas A&M University,College Station,TX 77843,USA [3]School of Physics,Henan Normal University,Xinxiang 453007,China [4]Southwestern Institute of Physics,Chengdu 610064,China

出　　处：《Nuclear Science and Techniques》2021年第7期22-30,共9页核技术（英文）

基　　金：This work was supported by the National MCF Energy R&D Program of China(No.MOST 2018YFE0310200);the National Natural Science Foundation of China(Nos.11805138 and 11705242);the Fundamental Research Funds For the Central Universities(Nos.YJ201820 and YJ201954)。

摘　　要：The neutral particle analyzer(NPA)is one of the crucial diagnostic devices in a Tokamak facility.The stripping unit is one of the main parts of the NPA.A windowless gas-stripping room with two differential pipes has been constructed in a parallel electric and magnetic fields(E//B)NPA.The pressure distributions in the stripping chamber are simulated by ANSYS Fluent together with MolFlow+.Based on the pressure distributions obtained from the simulation,the stripping efficiency of the E//B NPA is studied using GEANT4.Hadron reaction physics is modified to track the charge state of each particle in a cross-section-based method in GEANT4.The transmission rates(R)and stripping efficiencies f_(+1)are examined for particle energies ranging from 20 to 200 keV with the input pressure(P_(0)),ranging from 20 to 400 Pa.According to the combined global efficiency,R×f_(+1),P_(0)=240 Pa is obtained as the optimum pressure for the maximum global efficiency in the incident energy range investigated.

关 键 词：Neutral particle analyzer Windowless gas-stripping chamber Stripping efficiency Ansys Fluent MolFlow+ GEANT4 

分 类 号：TL631.24[核科学技术—核技术及应用]