Abstract
A neutron yield monitoring system based on a 10BF3 tube array was designed to monitor fast neutrons with an energy of 14 MeV and a yield of 104–108 produced by a deuterium-tritium fusion reaction. The array contained six 10BF3 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 0–60̂C, 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.
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