QtCDB2 software for coincidence Doppler broadening measurement system

16th International Conference on Positron Annihilation

Petriska, M.^1 ; Slugen, V.^1 ; Sabelová, V.^1 ; Soják, S.^1 ; Veterníková, Jana^1

Institute of Nuclear and Physical Engineering, Slovak Technical University, Bratislava, 812 19, Slovakia^1

关键词: Coincidence doppler broadening;    Coincidence measurement;    Data processing systems;    Detector pulse;    Digital system;    Digitizers;    HPGe detectors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012086/pdf
DOI  :  10.1088/1742-6596/443/1/012086

来源: IOP

【 摘 要 】

A digital system for the coincidence measurement of Doppler Broadening of positron annihilation (CDB) has been changed to one which is fully software based. Spectrometer is based on two HpGe detectors, HV sources and PC with PCI-9820D digitizer. Detector pulses are digitized directly at the HpGe detector pre-amplifier outputs. The previous external trigger chain was replaced by data processing system with a software trigger. All pulses from detectors are processed by a trapezoid filter. Spectrometer performance was tested and compared in various conditions.