Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 56: Instrumentierung
HK 56.3: Vortrag
Freitag, 21. März 2014, 11:45–12:00, HZ 8
Correction of differential nonlinearities in Analog-to-digital converters used for digital γ-ray spectroscopy — •Michael Weinert1, Andreas Hennig1, Wolfgang Hennig2, Nigel Warr1, Gheorghe Pascovici1, and Andreas Zilges1 — 1Institute for Nuclear Physics, University of Cologne — 2XIA LLC, Hayward CA 94544
Many experiments in nuclear structure and nuclear astrophysics demand for a spectroscopy setup with a high dynamic energy range while maintaining decent count rates. In such experiments conducted at the Cologne HORUS γ-ray spectrometer which is equipped with a fully digitized data acquisition system severe peak broadening and double peak structures in the energy spectra have been observed. These spectral distortions originate from the differential nonlinearity (DNL) of the Analog-to-digital converters used for digitizing the preamplifier signals. A correction method for this DNL using standard calibration sources and artificial pulser signals will be presented as well as an offline correction algorithm. The algorithm is capable of removing double peak structures and increasing the energy resolution for broadened peaks while achieving a better linearity in energy calibration compared to the uncorrected data.
Supported by the DFG (ZI 510/4-2).