Development of FPGA-Based Real-Time Neutron Spectrometer Using Stilbene Scintillator

Abstract

Neutron/gamma ray spectrometer based on a single-crystal stilbene scintillator with the photomultiplier tube 9266B was developed and tested. Signal acquisition and real-time processing is enabled by the fast ADC with the wide-band preamplifier and the Field-Programmable Gate Array (FPGA) core. The method of n/γ event separation based on frequency gradient analysis was implemented. The paper shows the efficiency of n/γ separation delivered by the spectrometer. The energy scale calibration of gamma channel was carried out by radionuclide gamma sources. The neutron channel energy calibration was done using accelerator-based neutron sources with deuterium-deuterium and deuterium-tritium fusion reactions. Real time registration of neutron spectra and gamma spectra in different channels of spectrometer was shown when acquiring amixed neutron and gamma flux. The paper illustrates the possibility of simultaneous registrations of 2.45 MeV and 14 MeV neutrons. The energy resolution of neutron spectrometer was measured. The neutron count rate up to 210 5 s −1 was demonstrated.

Data acquisition system for a neutron spectrometer with a remote diamond detector

“…The spectrometer is a completely unique authors development. It is a programmable hardware module with dimensions of 50 × 100 × 20 mm, focused on a wide range of VNC applications [18]. The project of its data processing unit was created using Quartus design environment and Verilog hardware description language.…”

Electron beam-plasma discharge in GDT mirror trap: experiments on plasma start-up with electron gun

“…Using such a detector, the time of appearance of hot electrons in the plasma at the corresponding radius is measured. To estimate the maximum energy of fast electrons, we use the neutron and gamma-ray spectrometer based on a stilbene scintillator [30].…”