Abstract
A triple GEM detector for low energy neutrons and high rejection of gamma background was tested at the CERF facility at CERN as stray neutron monitor. The detector was exposed to a wide neutron spectrum generated by a 120 GeV/c positively charged hadron beam hitting a copper target. The beam particle rate on target ranged over three orders of magnitude. The neutron count rate measured with the GEM could be linearly correlated with the beam intensity and also compared well with Monte Carlo simulations. The detector performance suggests that it can be used as an independent low energy neutron monitor at high-energy particle accelerator facilities.
Highlights
A triple GEM detector for low energy neutrons and high rejection of gamma background was tested at the CERF facility at CERN as stray neutron monitor
The experimental conditions inside the CERF target area were simulated in the past by Vincke et al [13] with the FLUKA Monte Carlo code [14, 15], in order to study the response of six air-filled ionization chambers for radiation protection applications
A Triple GEM detector had previously been tested as in-beam monitor of relativistic hadron beams [17]
Summary
The detector, described in detail in previous studies [7], has an active area of 5 × 5 cm and filled with Ar/CO2 (70/30) gas mixture (figure 1). The charged particles highly ionize the gas mixture in the drift region of the detector producing secondary electrons (figure 2). These electrons drift reaching the three GEM foils where they are multiplied and produce a detectable signal in the induction gap. This multilayer structure offers higher conversion efficiency than a single layer, because there is higher probability of neutron interaction. The threshold set by the FPGA board to the CARIOCA chips eliminates all possible sources of electronic noise. The field values applied were 3, 3, 3, 5 kV/cm from drift to induction gap
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