Spectroscopic performances of the GERDA cryogenic charge sensitive amplifier based on JFET-CMOS ASIC, coupled to germanium detectors

Alessio D'Andragora, Carla M. Cattadori, Assunta Di Vacri, Matthias Junker, Luciano Pandola, Alberto Pullia, Stefano Riboldi, Francesca Zocca, Marik Barnabé Heider, Dusan Budjáš, Jürgen Kiko, Stefan Schönert, Konstantin Gusev, Béla Majorovits

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

In the GERDA (GERmanium Detector Array) double-beta-decay experiment, it is planned to operate in liquid Argon (LAr) germanium detectors, organized in three fold strings. In this application the use of cryogenic front-end (FE) electronics is mandatory. Two versions of Charge Sensitive Amplifier (CSA), namely a 1-channel (1-ch) and a 3-channel (3-ch), based on JFET-CMOS circuits, have been realized and tested. The 3-chs CSA are designed to serve the detector string. While in the reference test the 1-ch circuit and a custom encapsulated germanium (Ge) detector (SUB) were operated both submerged in liquid Nitrogen (LN2), in the naked detector test both the 1-ch circuit and the naked unsegmented Ge detector were submerged in liquid Argon (LAr). A resolution of 3.2 keV FWHM at 1.332 MeV 60Co has been obtained in the latter configuration to be compared to 2.2 keV obtained in the reference test. The 3-ch CSA, based on three JFETs connected to three channels of the CMOS ASIC, mounted on a Cuflon PCB, has been tested both coupled to the reference SUB and to a naked prototype detector. The obtained resolution for the 1.332 MeV line of 60Co was 2.4 keV with the CSA coupled to the SUB, and 2.9 keV with the naked Ge detector. The spectroscopic performances have been measured connecting the CSA output to an acquisition system through 10 m long cryogenic cables to simulate the real FE connection in the GERDA environment.

Original languageEnglish
Title of host publication2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009
Pages396-400
Number of pages5
DOIs
StatePublished - 2009
Externally publishedYes
Event2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009 - Orlando, FL, United States
Duration: 25 Oct 200931 Oct 2009

Publication series

NameIEEE Nuclear Science Symposium Conference Record
ISSN (Print)1095-7863

Conference

Conference2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009
Country/TerritoryUnited States
CityOrlando, FL
Period25/10/0931/10/09

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