Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2015, Vol. 26 ›› Issue (4): 040602 doi: 10.13538/j.1001-8042/nst.26.040602

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Analysis and optimization of energy resolution of neutron-TPC

HUANG Meng,1,2 LI Yu-Lan,1,2 NIU Li-Bo, 1,2LI Jin,1,2,3 LI Yuan-Jing1,2   

  1. 1Department of Engineering Physics, Tsinghua University, Beijing 100084, China
    2Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
    3Institute of High Energy Physics, Beijing 100049, China
  • Contact: LI Yu-Lan E-mail:yulanli@mail.tsinghua.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China (No. 11275109)

HUANG Meng, LI Yu-Lan, NIU Li-Bo, LI Jin, LI Yuan-Jing. Analysis and optimization of energy resolution of neutron-TPC.Nuclear Science and Techniques, 2015, 26(4): 040602     doi: 10.13538/j.1001-8042/nst.26.040602

Abstract:

Neutron-TPC (nTPC) is a fast neutron spectrometer based on GEM-TPC (Gas Electron Multiplier-Time Projection Chamber) and expected to be used in nuclear physics, nuclear reactor operation monitoring, and thermonuclear fusion plasma diagnostics. By measuring the recoiled proton energy and slopes of the proton tracks, the incident neutron energy can be deduced. It has higher n/ separation ability and higher detection efficiency than conventional neutron spectrometers. In this paper, neutron energy resolution of nTPC is studied using the analytical method. It is found that the neutron energy resolution is determined by 1) the proton energy resolution (σEp/Ep), and 2) standard deviation of slopes of the proton tracks caused by multiple Coulomb scattering (σk(scattering)) and by the track fitting accuracy (σk(fit)). Suggestions are made for optimizing energy resolution of nTPC. Proper choices of the cut parameters of reconstructed proton scattering angles (θcut), the number of fitting track points (N), and the working gas help to improve the neutron energy resolution.

Key words: Neutron-TPC, Energy resolution, Analytical method, Multiple Coulomb scattering