Recovery of Particle Detector Degeneration Based on the Pulse Height Spectrum of an Adaptive Trapezoidal Pulse Shaper

Garnica, Óscar; Lanchares, Juan; Velasco, Josè M.; Hidalgo, J. Ignacio

doi:10.1109/tns.2017.2677522

Cited by 3 publications

(2 citation statements)

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“…However, the shape of trapezoidal pulses is susceptible to the deformation of input signals, which can be caused by the degeneration of detectors [21,22] and the fluctuation of environment temperature. There have been discussions on this topic [23,24] which all require real-time adjustment of the trapezoidal arguments to correct the deformed pulses.…”

Section: Jinst 18 P04036mentioning

confidence: 99%

“…Garnica at al. [23] used the pulse height spectrum to adjust the pulse shaping arguments. It requires at least 10 4 to 10 5 events at the 511 keV peak to stabilize the peak position in our system, which would cost several minutes in practice, so the conditions of the spectrometer may have changed before new arguments take effects.…”

Section: D Spectrum Peak Drift Correctionmentioning

confidence: 99%

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A fully digital coincidence Doppler broadening spectrometer based on FPGA

et al. 2023

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In this article, we implemented a fully digital Coincidence Doppler Broadening (CDB) spectrometer consisting of two HPGe detectors, a fully digital processing and acquisition board, and a dedicated software system. The Field Programmable Gate Array (FPGA) on the board extracts energy and time stamp of digitized pulses from HPGe detectors, and communicates with the dedicated software by which the single channel spectrums and 2D coincidence spectrum were produced. We designed an instruction set dedicated to the CDB Spectrometer and the controller module in FPGA so that the FPGA subsystem is fully controllable and configurable. The trapezoidal pulse shaping algorithm was implemented in FPGA whose arguments are all configurable through the dedicated software by the instruction set. We examined the long-term stability of the spectrometer by 511 keV peak position of both channels. The 2D Gaussian fitting is performed on coincidence spectrum by the software to correct the peak drift of both channels. The results show that this method effectively improves the Doppler-broadened spectrum, by which the peak-to-background ratio increases from 7.0 × 105 to 1.9 × 106.

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