Design and performance of the front-end electronics for a ¹⁰BF₃ tube array

Abstract

A: A neutron yield monitoring system based on a 10 BF 3 tube array was designed to monitor fast neutrons with an energy of 14 MeV and a yield of 10 4 -10 8 produced by a deuterium-tritium fusion reaction. The array contained six 10 BF 3 tubes of different sizes. The signal readout system used a charge sensitive preamplifier (CSA) as the front-end circuit. The CSA was optimized and tested to ensure that it met the measurement requirements for low charge and high counting rate. The zero-capacitance equivalent noise charge (ENC) was 2425 e − and the ENC slope was 15 e − /pF. In the temperature range 0-60 • C, the ENC slope was 10 e − / • C and the baseline drift was less than 0.05 mV/ • C. In the 10 h long-term stability test, the baseline drift was less than 0.07 mV.