分类： 物理学 >> 核物理学 提交时间： 2023-06-26
Yuan Luo
Wei-Ping Lin
Pei-Pei Ren
Guo-Feng Qu
Jing-Jun Zhu
Xing-Quan Liu
Xiao-Bing Lu
Zhu An
Roy Wada
Lin-Ge Zang
Yu-Fan Qu
Zhong-Bing Sh
摘要： Neutral Particle Analyzer (NPA) is one of the crucial diagnostic devices on Tokamak facilities. Stripping unit is one of the main parts of the NPA. A windowless gas stripping room with two differential pipes is adopted in a parallel direction of 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 extracted from the simulation, the stripping efficiency of the E//B NPA is studied with GEANT4. The hadron reaction physics is modified to track the charge state of each particle in a cross section base method in GEANT4. The transmission rates ($R$) and the stripping efficiencies $f_{+1}$ are examined for the particle energy ranging from 20 to 200 keV at the input pressure ($P_0$) ranging from 20 to 400 Pa. According to the combined global efficiency, $R \times f_{+1}$, $P_0$ = 240 Pa is obtained as the optimum pressure for the maximum global efficiency in the incident energy range investigated.
分类： 物理学 >> 核物理学 提交时间： 2023-06-18 合作期刊: 《Nuclear Science and Techniques》
ZHANG Suyalatu
CHEN Zhi-Qiang
HAN Rui
Roy Wada
LIU Xing-Quan
LIN Wei-Ping
LIU Jian-Li
SHI Fu-Dong
REN Pei-Pei
TIAN Guo-Yu
LUO Fei
摘要： A Neutron Time-Of-Flight (NTOF) spectrometer, based at the Heavy Ion Research Facility in Lanzhou (HIRFL) was developed for studies of neutron production of proton induced spallation reactions related to the ADS project. After the presentation of comparisons between calculated spallation neutron production double-differential cross sections and the available experimental data, a detailed description of the NTOF spectrometer is given. Test beam results show that the spectrometer works well and data analysis procedures are established. The comparisons of the test beam neutron spectra with those of GEANT4 simulations are presented.
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