The MAJORANA DEMONSTRATOR will search for the neutrinoless double beta decay (ßß(0?) of the isotope 76Ge with a mixed array of enriched and natural Germanium detectors. In view of the next generation of tonne-scale germanium-based (ßß(0?)-decay searches, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest (ROI) around the 2039-keV Q-value of the 76Ge (ßß(0?)-decay. Such a requirement on the background level significantly constrains the design of the readout electronics, which is further driven by noise and energy resolution performances. We present here the low-noise low background front-end electronics developed for the low-capacitance p-type point contact (P-PC) germanium detectors of the MAJORANA DEMONSTRATOR. This resistive-feedback front-end, specifically designed to have low mass, is fabricated on a radioassayed fused-silica substrate where the feedback resistor consists of a sputtered thin film of high purity amorphous germanium and the feedback capacitor is based on the capacitance between gold conductive traces.
Revised: June 7, 2018 |
Published: July 21, 2015
Citation
Abgrall N., E. Aguayo, F.T. Avignone, A.S. Barabash, F. Bertrand, M. Boswell, and V. Brudanin, et al. 2015.The MAJORANA low-noise low-background front-end electronics.Physics Procedia 61.PNNL-SA-111627.doi:10.1016/j.phpro.2014.12.066