Cryogenic low-noise charge sensitive preamplifiers have been realized and tested for the GERmanium Detector Array (GERDA). In the search of neutrino-less double-beta decay of 76Ge at LNGS, GERDA will operate bare segmented germanium detectors immersed in liquid argon. The front-end electronics will operate in the cryogenic liquid too. An integrated JFET-CMOS preamplifier, which is fully functional at cryogenic temperatures, has been developed and realized. It has been tested in conjunction with an unsegmented p-type HPGe detector. Both the crystal and the preamplifier were operated inside a liquid nitrogen dewar at 77 K. The detector capacitance was ~ 60 pF. An optimum resolution of 1.6 keV fwhm was obtained on the pulser line at 6 μs shaping time. The obtained resolution for the 1.332 MeV line from a 60Co source was of 2.2 keV fwhm. No peak shifts or line broadenings were seen during long-term acquisitions, thanks also to the extremely high preamplifier loop gain which yields a very high closed-loop gain stability. A wide bandwidth (rise time of 16 ns) permits use of pulse-shape analysis techniques to localize the position of the photon interactions inside the detector. A low power consumption (23.4 mW) makes the preamplifier suitable for the foreseen multi-channel array of germanium detectors.
A cryogenic low-noise JFET-CMOS preamplifier for the HPGe detectors of GERDA / A. Pullia, F. Zocca, S. Riboldi, D. Budjas, A. D'Andragora, C. Cattadori - In: IEEE Nuclear Science Symposium conference record, 2008 : 19 - 25 Oct. 2008, Dresden, Germany / [a cura di] P. Sellin. - Piscataway : IEEE, 2008. - ISBN 9781424427154. - pp. 2056-2060 (( convegno Nuclear science symposium tenutosi a Dresden nel 2008.
|Titolo:||A cryogenic low-noise JFET-CMOS preamplifier for the HPGe detectors of GERDA|
PULLIA, ALBERTO (Primo)
ZOCCA, FRANCESCA (Secondo)
|Parole Chiave:||CMOS circuit; germanium detector; charge preamplifier|
|Settore Scientifico Disciplinare:||Settore ING-INF/01 - Elettronica|
|Data di pubblicazione:||2008|
|Enti collegati al convegno:||IInstitute of Electrical and Electronic Engineers (IEEE)|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1109/NSSMIC.2008.4774881|
|Tipologia:||Book Part (author)|
|Appare nelle tipologie:||03 - Contributo in volume|