Study of a GaAs:Cr-based Timepix detector using synchrotron facility
- 1 November 2017
- journal article
- Published by IOP Publishing in Journal of Instrumentation
- Vol. 12 (11), P11009
- https://doi.org/10.1088/1748-0221/12/11/p11009
Abstract
High resistivity gallium arsenide compensated by chromium fabricated by Tomsk State University has demonstrated a good suitability as a sensor material for hybrid pixel detectors used in X-ray imaging systems with photon energies up to 60 keV. The material is available with a thickness up to 1 mm and due to its Z number a high absorption efficiency in this energy region is provided. However, the performance of thick GaAs:Cr-based detectors in spectroscopic applications is limited by readout electronics with relatively small pixels due to the charge sharing effect. In this paper, we present the experimental investigation of the charge sharing effect contribution in the GaAs:Cr-based Timepix detector. By means of scanning the detector with a pencil photon beam generated by the synchrotron facility, the geometrical mapping of pixel sensitivity is obtained, as well as the energy resolution of a single pixel. The experimental results are supported by numerical simulations. The observed limitation of the GaAs:Cr-based Timepix detector for the high flux X-ray imaging is discussed.Keywords
This publication has 9 references indexed in Scilit:
- Investigation of GaAs:Cr Timepix assemblies under high flux irradiationJournal of Instrumentation, 2015
- Chromium compensated gallium arsenide detectors for X-ray and γ-ray spectroscopic imagingNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2014
- The Medipix3RX: a high resolution, zero dead-time pixel detector readout chip allowing spectroscopic imagingJournal of Instrumentation, 2013
- Characterisation of a GaAs(Cr) Medipix2 hybrid pixel detectorNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2011
- Study of charge-sharing in MEDIPIX3 using a micro-focused synchrotron beamJournal of Instrumentation, 2011
- Gmsh: A 3‐D finite element mesh generator with built‐in pre‐ and post‐processing facilitiesInternational Journal for Numerical Methods in Engineering, 2009
- Timepix, a 65k programmable pixel readout chip for arrival time, energy and/or photon counting measurementsNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007
- Noise and interpixel dead space studies of GaAs pixellated detectorsNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
- Charge loss between contacts of CdZnTe pixel detectorsNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1999