Comparison of Experiment and Simulation of the triple GEM-Based Fast Neutron Detector
WANG Xiao-Dong1, ZHANG Jun-Wei2, HU Bi-Tao3**, YANG He-Run2, DUAN Li-Min2, LU Chen-Gui2, HU Rong-Jiang2, ZHANG Chun-Hui3, ZHOU Jian-Rong4, YANG Lei3, AN Lv-Xing5, LUO Wen1
1School of Nuclear Science and Technology, University of South China, Hengyang 421001 2Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 3School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000 4Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 5LWD Logging Center, China Petroleum Logging, CO. LTD., Xi'an 710000
Abstract：neutrons based on a 10×10 cm2 triple gas electron multiplier (GEM) device is developed and tested. A neutron converter, which is a high density polyethylene (HDPE) layer, is combined with the triple GEM detector cathode and placed inside the detector, in the path of the incident neutrons. The detector is tested by obtaining the energy deposition spectrum with an Am Be neutron source in the Institute of Modern Physics (IMP) at Lanzhou. In the present work we report the results of the tests and compare them with those of simulations. The transport of fast neutrons and their interactions with the different materials in the detector are simulated with the GEANT4 code, to understand the experimental results. The detector displays a clear response to the incident fast neutrons. However, an unexpected disagreement in the energy dependence of the response between the simulated and measured spectra is observed. The neutron sources used in our simulation include deuterium-tritium (DT, 14 MeV), deuterium-deuterium (DD, 2.45 MeV), and Am Be sources. The simulation results also show that among the secondary particles generated by the incident neutron, the main contributions to the total energy deposition are from recoil protons induced in hydrogen-rich HDPE or Kapton (GEM material), and activation photons induced by neutron interaction with Ar atoms. Their contributions account for 90% of the total energy deposition. In addition, the dependence of neutron deposited energy spectrum on the composition of the gas mixture is presented.
. [J]. 中国物理快报, 2015, 32(03): 32901-032901.
WANG Xiao-Dong, ZHANG Jun-Wei, HU Bi-Tao, YANG He-Run, DUAN Li-Min, LU Chen-Gui, HU Rong-Jiang, ZHANG Chun-Hui, ZHOU Jian-Rong, YANG Lei, AN Lv-Xing, LUO Wen. Comparison of Experiment and Simulation of the triple GEM-Based Fast Neutron Detector. Chin. Phys. Lett., 2015, 32(03): 32901-032901.
2015, Vol. 32 
