A complete spectrometric system has been built for timing measurements and detection of gamma rays in coincidence. It contains two HPGe detectors and complete independent NIM-based timing and trigger measurement setup. There is also triggered dual ADC USB readout used for data processing.
The system consists of two precise spectroscopic chains, which are triggered by a signal generated by two fast chains under the condition of occurence in a specific time window. This ensures that only spectroscopic signals in coincidence are recorded. The modularity enables triggering of additional devices working with CMOS or TTL signals, which are produced based on CFD outputs connected within the fast branch of the amplified signal. The signal can be then used to event stamping or instigation of the acquisition in other detectors intended to measure in coincidence with the HPGe detectors. Triggers can be shifted in time in the range of nanoseconds. Theoretical capacity of uniformly distributed events measured by HPGe detectors, working with FWHM of 2keV, is around 200 000 records per second. Anticoincidence measurements are supported by reversing polarity of signals. For users we also offer a preparation of HPGe with Timepix coincidence measurements and full support with data evaluation.
FIG. 1: Coincidence setup with two facing HPGe detectors.
FIG. 2: 3D coincidence energy spectrum of 60Co measured with the setup.
FIG. 3: 2D coincidence energy spectrum of 152Eu measured with the setup.
Preparation of the experimental setup was done in frame of the research funding grant "VdG Research infrastructure" by the Ministry of Education, Youth and Sports of the Czech Republic (Contract No. LM2015077).
Last update: January 2021