Estimate interaction timing in a large volume HgI2 detector using cathode pulse waveforms

L. J. Meng, Z. He

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents experimental results on the timing resolution achieved with a 5 mm thick HgI2 detector. The timing information was derived based on the cathode pre-amplifier pulse waveform, measured using a digital oscilloscope. The times of interaction were estimated by fitting the measured pulse waveforms to pre-defined waveform models. With this approach, problems related to the conventional leading edge or constant fraction triggering, such as slow charge carrier mobility, pulse shape variation and depth-dependent detector response can be greatly reduced. As a result, we showed a 13 ns timing resolution measured using the 5 mm thick HgI2 detector and a BaF2 coincidence detector with 511 keV full energy events. In this paper, we discuss several waveform models and the results achieved using these models.

Original languageEnglish (US)
Pages (from-to)234-251
Number of pages18
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume545
Issue number1-2
DOIs
StatePublished - Jun 11 2005
Externally publishedYes

Keywords

  • Large volume HgI detector
  • Pulse waveform
  • Timing resolution

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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