Pulse shape analysis of HPGe detector signals with a flash ADC system to improve the coincidence time resolution

Author

Ender, C. ; Schwebel, S. ; Ohlemeyer, C. ; Schwalm, D.

Author_Institution

Phys. Inst., Heidelberg Univ., Germany

fYear

1991

fDate

2-9 Nov. 1991

Abstract

Summary form only given. For the new large germanium detector arrays (e.g. EUROGAM, Gammasphere, Euroball, etc.) which are currently under design/in construction, an improved time resolution is desirable to improve the coincidence time resolution. Currently with Ge-Ge timing one can reach a time resolution of the order of 20 ns with large detectors (>30% efficiency). By digitizing the signal every 10 ns with a flash analog-to-digital converter (ADC) system and a following analysis of the digitized pulse, the time resolution can improve relative to conventional techniques (time filter and constant fraction). Measurements show a time resolution of about 9 ns using a conventional technique for a fast plastic and a high-purity germanium (HPGe) detector. With digital pulse shape analysis a resolution of 3 ns is observed.<>

Keywords

analogue-digital conversion; nuclear electronics; semiconductor counters; time measurement; 3 ns; 9 ns; EUROGAM; Euroball; Gammasphere; HPGe detector signals; coincidence time resolution; digital pulse shape analysis; flash ADC system; plastic; time resolution; Analog-digital conversion; Detectors; Germanium; Pulse shaping methods; Sensor arrays; Shape; Signal analysis; Signal detection; Signal resolution; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE

Conference_Location

Santa Fe, NM, USA

Print_ISBN

0-7803-0513-2

Type

conf

DOI

10.1109/NSSMIC.1991.258925

Filename

258925