Exploring the limiting timing resolution for large volume CZT detectors with waveform analysis

L. J. Meng, Z. He

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents a study for exploring the limiting timing resolution that can be achieved with a large volume 3-D position sensitive CZT detector. The interaction timing information was obtained by fitting the measured cathode waveforms to pre-defined waveform models. We compared the results from using several different waveform models. Timing resolutions, of ∼9.5 ns for 511 keV full-energy events and ∼11.6 ns for all detected events with energy deposition above 250 keV, were achieved with a detailed modeling of the cathode waveform as a function of interaction location and energy deposition. This detailed modeling also allowed us to derive a theoretical lower bound for the error on estimated interaction timing. Both experimental results and theoretical predications matched well, which indicated that the best timing resolution achievable in the 1 cm3 CZT detector tested is ∼10 ns. It is also showed that the correlation between sampled amplitudes in cathode waveforms is an important limiting factor for the achievable timing resolution.

Original languageEnglish (US)
Pages (from-to)435-445
Number of pages11
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume550
Issue number1-2
DOIs
StatePublished - Sep 11 2005

Keywords

  • Large volume 3-D position sensitive czt
  • Timing resolution
  • Waveform analysis

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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