Design and implementation of the NaI (Tl)CsI (Na) detectors output signal generator

TL;DR

This paper presents the design and implementation of a programmable signal generator that simulates the output of NaI (Tl)CsI (Na) detectors for the HXMT, utilizing FPGA technology and VHDL to produce statistically accurate random pulse signals.

Contribution

The paper introduces a novel FPGA-based double exponential random pulse generator with programmable amplitude distribution and exponential inter-arrival times for detector simulation.

Findings

Successfully simulated detector output signals with desired statistical properties.

Achieved programmable amplitude and timing distributions.

Demonstrated the generator's suitability for detector signal simulation in space telescopes.

Abstract

We designed and implemented a signal generator that can simulate the output of the NaI (Tl)CsI (Na) detectors pre amplifier onboard the Hard X ray Modulation Telescope (HXMT). Using the development of FPGA (Field Programmable Gate Array) with VHDL language and adding random constituent, we have finally produced the double exponential random pulse signal generator. The statistical distribution of signal amplitude is programmable. The occurrence time intervals of adjacent signals content negative exponential distribution statistically.