Dual-polarity pulse processing and analysis for charge-loss correction in cadmium–zinc–telluride pixel detectors

Gaetano Gerardi, Fabio Principato, Leonardo Abbene, Andrea Zappettini, Nicola Zambelli, Matthew C. Veale, Oliver Fox, Kawal Sawhney, Giacomo Benassi, Paul Seller, Manuele Bettelli

Risultato della ricerca: Article

2 Citazioni (Scopus)

Abstract

Charge losses at the inter-pixel gap are typical drawbacks in cadmium–zinc–telluride (CZT) pixel detectors. In this work, an original technique able to correct charge losses occurring after the application of charge-sharing addition (CSA) is presented. The method, exploiting the strong relation between the energy after CSA and the beam position at the inter-pixel gap, allows the recovery of charge losses and improvements in energy resolution. Sub-millimetre CZT pixel detectors were investigated with both uncollimated radiation sources and collimated synchrotron X-rays, at energies below and above the K-shell absorption energy of the CZT material. The detectors are DC coupled to fast and low-noise charge-sensitive preamplifiers (PIXIE ASIC) and followed by a 16-channel digital readout electronics, performing multi-parameter analysis (event arrival time, pulse shape, pulse height). Induced-charge pulses with negative polarity were also observed in the waveforms from the charge-sensitive preamplifiers (CSPs) at energies >60 keV. The shape and the height of these pulses were analysed, and their role in the mitigation of charge losses in CZT pixel detectors. These activities are in the framework of an international collaboration on the development of energy-resolved photon-counting systems for spectroscopic X-ray imaging (5–140 keV).
Lingua originaleEnglish
pagine (da-a)1078-1092
Numero di pagine15
RivistaJournal of Synchrotron Radiation
Volume25
Stato di pubblicazionePublished - 2018

All Science Journal Classification (ASJC) codes

  • Radiation
  • Instrumentation
  • Nuclear and High Energy Physics

Cita questo

Dual-polarity pulse processing and analysis for charge-loss correction in cadmium–zinc–telluride pixel detectors. / Gerardi, Gaetano; Principato, Fabio; Abbene, Leonardo; Zappettini, Andrea; Zambelli, Nicola; Veale, Matthew C.; Fox, Oliver; Sawhney, Kawal; Benassi, Giacomo; Seller, Paul; Bettelli, Manuele.

In: Journal of Synchrotron Radiation, Vol. 25, 2018, pag. 1078-1092.

Risultato della ricerca: Article

Gerardi, G, Principato, F, Abbene, L, Zappettini, A, Zambelli, N, Veale, MC, Fox, O, Sawhney, K, Benassi, G, Seller, P & Bettelli, M 2018, 'Dual-polarity pulse processing and analysis for charge-loss correction in cadmium–zinc–telluride pixel detectors', Journal of Synchrotron Radiation, vol. 25, pagg. 1078-1092.
Gerardi, Gaetano ; Principato, Fabio ; Abbene, Leonardo ; Zappettini, Andrea ; Zambelli, Nicola ; Veale, Matthew C. ; Fox, Oliver ; Sawhney, Kawal ; Benassi, Giacomo ; Seller, Paul ; Bettelli, Manuele. / Dual-polarity pulse processing and analysis for charge-loss correction in cadmium–zinc–telluride pixel detectors. In: Journal of Synchrotron Radiation. 2018 ; Vol. 25. pagg. 1078-1092.
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title = "Dual-polarity pulse processing and analysis for charge-loss correction in cadmium–zinc–telluride pixel detectors",
abstract = "Charge losses at the inter-pixel gap are typical drawbacks in cadmium–zinc–telluride (CZT) pixel detectors. In this work, an original technique able to correct charge losses occurring after the application of charge-sharing addition (CSA) is presented. The method, exploiting the strong relation between the energy after CSA and the beam position at the inter-pixel gap, allows the recovery of charge losses and improvements in energy resolution. Sub-millimetre CZT pixel detectors were investigated with both uncollimated radiation sources and collimated synchrotron X-rays, at energies below and above the K-shell absorption energy of the CZT material. The detectors are DC coupled to fast and low-noise charge-sensitive preamplifiers (PIXIE ASIC) and followed by a 16-channel digital readout electronics, performing multi-parameter analysis (event arrival time, pulse shape, pulse height). Induced-charge pulses with negative polarity were also observed in the waveforms from the charge-sensitive preamplifiers (CSPs) at energies >60 keV. The shape and the height of these pulses were analysed, and their role in the mitigation of charge losses in CZT pixel detectors. These activities are in the framework of an international collaboration on the development of energy-resolved photon-counting systems for spectroscopic X-ray imaging (5–140 keV).",
keywords = "CdZnTe detectors; charge losses; charge sharing; energy-resolved photon-counting detectors; X-ray and gamma-ray detectors; Radiation; Nuclear and High Energy Physics; Instrumentation",
author = "Gaetano Gerardi and Fabio Principato and Leonardo Abbene and Andrea Zappettini and Nicola Zambelli and Veale, {Matthew C.} and Oliver Fox and Kawal Sawhney and Giacomo Benassi and Paul Seller and Manuele Bettelli",
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T1 - Dual-polarity pulse processing and analysis for charge-loss correction in cadmium–zinc–telluride pixel detectors

AU - Gerardi, Gaetano

AU - Principato, Fabio

AU - Abbene, Leonardo

AU - Zappettini, Andrea

AU - Zambelli, Nicola

AU - Veale, Matthew C.

AU - Fox, Oliver

AU - Sawhney, Kawal

AU - Benassi, Giacomo

AU - Seller, Paul

AU - Bettelli, Manuele

PY - 2018

Y1 - 2018

N2 - Charge losses at the inter-pixel gap are typical drawbacks in cadmium–zinc–telluride (CZT) pixel detectors. In this work, an original technique able to correct charge losses occurring after the application of charge-sharing addition (CSA) is presented. The method, exploiting the strong relation between the energy after CSA and the beam position at the inter-pixel gap, allows the recovery of charge losses and improvements in energy resolution. Sub-millimetre CZT pixel detectors were investigated with both uncollimated radiation sources and collimated synchrotron X-rays, at energies below and above the K-shell absorption energy of the CZT material. The detectors are DC coupled to fast and low-noise charge-sensitive preamplifiers (PIXIE ASIC) and followed by a 16-channel digital readout electronics, performing multi-parameter analysis (event arrival time, pulse shape, pulse height). Induced-charge pulses with negative polarity were also observed in the waveforms from the charge-sensitive preamplifiers (CSPs) at energies >60 keV. The shape and the height of these pulses were analysed, and their role in the mitigation of charge losses in CZT pixel detectors. These activities are in the framework of an international collaboration on the development of energy-resolved photon-counting systems for spectroscopic X-ray imaging (5–140 keV).

AB - Charge losses at the inter-pixel gap are typical drawbacks in cadmium–zinc–telluride (CZT) pixel detectors. In this work, an original technique able to correct charge losses occurring after the application of charge-sharing addition (CSA) is presented. The method, exploiting the strong relation between the energy after CSA and the beam position at the inter-pixel gap, allows the recovery of charge losses and improvements in energy resolution. Sub-millimetre CZT pixel detectors were investigated with both uncollimated radiation sources and collimated synchrotron X-rays, at energies below and above the K-shell absorption energy of the CZT material. The detectors are DC coupled to fast and low-noise charge-sensitive preamplifiers (PIXIE ASIC) and followed by a 16-channel digital readout electronics, performing multi-parameter analysis (event arrival time, pulse shape, pulse height). Induced-charge pulses with negative polarity were also observed in the waveforms from the charge-sensitive preamplifiers (CSPs) at energies >60 keV. The shape and the height of these pulses were analysed, and their role in the mitigation of charge losses in CZT pixel detectors. These activities are in the framework of an international collaboration on the development of energy-resolved photon-counting systems for spectroscopic X-ray imaging (5–140 keV).

KW - CdZnTe detectors; charge losses; charge sharing; energy-resolved photon-counting detectors; X-ray and gamma-ray detectors; Radiation; Nuclear and High Energy Physics; Instrumentation

UR - http://hdl.handle.net/10447/295828

UR - http://onlinelibrary.wiley.com/journal/10.1107/S16005775

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JO - Journal of Synchrotron Radiation

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