The Majorana Low-noise Low-background Front-end Electronics

Conference · Sun Mar 01 00:00:00 EST 2015

DOI:https://doi.org/10.1016/j.phpro.2014.12.066· OSTI ID:1481652

Abgrall, N. ^[1]; Aguayo, E. ^[2]; Bertrand Jr, Fred E. ^[3]; Galindo-Uribarri, Alfredo {nmn}  ^[3]; Green, Matthew P. ^[3]; Radford, David C.  ^[3]; Romero Romero, Elisa ^[3]; Varner Jr, Robert L.  ^[3]; Wilkerson, John F. ^[3]; Yu, Chang-Hong  ^[3]; Yumatov, V. ^[4]

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1. Lawrence Berkeley National Laboratory (LBNL)
2. Pacific Northwest National Laboratory (PNNL)
3. ORNL
4. Institute of Theoretical & Experimental Physics (ITEP), Moscow, Russia

The MAJORANA DEMONSTRATOR will search for the neutrinoless double beta decay (ββ(0ν)) 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 ββ(0ν)-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 ββ(0ν)-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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1481652
• Resource Relation: Journal Volume: 61; Conference: 13th International Conference on Topics in Astroparticle and Underground Physics (TAUP) - Monterety Peninsula, California, United States of America - 9/8/2013 8:00:00 AM-9/13/2013 8:00:00 AM
• Country of Publication: United States
• Language: English