Abstract
The outstanding advantage of digital signal processing (DSP) techniques and Field Programmable Gate Array (FPGA) technology is capable of improving the quality of the experimental measurements for nuclear radiation. In this article, a compact DMCA 8 K was designed and manufactured using DSP technique based on FPGA technology. In particular, the output of the preamplifier is completely processed by digital techniques which are obtained from the analog-to-digital converter (ADC) to calculate the baseline, DC offset, energy peaks, pile up, threshold discrimination and then the form of energy spectrum. The Spartan-6 board is used as a hardware for the development of the digital multichannel analyzer (DMCA), which is equipped with the 14-bit AD6645 with 62.5 Msps sample rate. The application software for instrument control, data acquisition and data processing was written under C++ builder via the RS-232 interface. The designed DMCA system has been tested with a HPGe detector using gamma sources of 60Co and 137Cs and a reference pulser.
Highlights
The task of electronics in systems of nuclear physics is to collect the electrical charge deposited in a radiation detector and to convert it into a digital code to be further analyzed by digital elements
A compact digital multichannel analyzer (DMCA) 8 K was designed and manufactured using digital signal processing (DSP) technique based on Field Programmable Gate Array (FPGA) technology
The Spartan-6 board is used as a hardware for the development of the digital multichannel analyzer (DMCA), which is equipped with the 14-bit AD6645 with 62.5 Msps sample rate
Summary
The task of electronics in systems of nuclear physics is to collect the electrical charge deposited in a radiation detector and to convert it into a digital code to be further analyzed by digital elements. The goal of our design was to build a digital multi-channel analyzer system that would completely base on DSP techniques This system has functioned as follows: - Digital implementation of the shaping amplifier and peak sensing ADC, - Charge sensitive preamplifier directly connected to the digitizer, - Providing pulse height, time-stamp (16 ns) and optionally raw data, - Pile-up rejection, baseline restoration, ballistic deficit correction, - Best suited for high-resolution spectroscopy (HPGe and Si detectors). For such purposes, a set of algorithms used in the digital spectrometric channel containing all necessary data acquisition elements have been developed
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