Characterization of a GEM-based fast neutron detector

被引：9
|
作者：
Esposito, B. [1 ]
Marocco, D. [1 ]
Villari, R. [1 ]
Murtas, F. [2 ]
Rodionov, R. [3 ]
机构：
[1] Assoc Euratom ENEA Sulla Fus, I-00044 Rome, Italy
[2] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Rome, Italy
[3] SRC RF TRINITI Troitsk, Moscow, Russia
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2014年 / 741卷
关键词：
Neutron detector; GEM; Fusion; GAS ELECTRON MULTIPLIER; GENERATOR;
D O I：
10.1016/j.nima.2013.11.103
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The neutron efficiency of a Gas Electron Multiplier (GEM)-based detector designed for fast neutron measurements in fusion devices was determined through the combined use of Monte Carlo (MCNPX) calculations and analysis of deuterium-deuterium and deuterium-tritium neutron irradiation experiments. The detector, characterized by a triple GEM structure flushed with a Ar/CO2/CF4 - 45/15/40 gas mixture, features a digital read-out system and has two sub-units for the detection of 2.5 + 14 MeV neutrons and 14 MeV neutrons (U-DD and U-DT, respectively). The pulse height spectra (PHS) determined from the curves of experimental efficiency as a function of the detector's high voltage (HV) and the MCNPX-simulated PHS were compared using a fitting routine that finds the best match between the experimental and simulated PHS by assuming a parametric model for the relation between HV (that determines the detector's gain) and the energy deposited in the gas. This led to express the experimental neutron efficiency as a function of the discrimination level set on the deposited energy (energy threshold). The detector sensitivity to gamma-rays was also analyzed and the operational range in which the gamma-ray contribution to the signal is not negligible was determined It is found that this detector can reach a maximum neutron efficiency of similar to 1 x 10(-3) counts/it at 2.5 MeV (U-DD sub unit) and of similar to 4 x 10(-3) counts/n at 14 MeV (U-DT and U-DD sub units) (C) 2014 EURATOM ENEA. Published by Elsevier B.V. All rights reserved
引用
收藏
页码：196 / 204
页数：9
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