Measurement of the energy resolution and calibration of hybrid pixel detectors with GaAs:Cr sensor and Timepix readout chip
A.P. Butler, P.H. Butler, S.T. Bell, G.A. Chelkov, D.V. Dedovich, M.A., Demichev, V.G. Elkin, M.I. Gostkin, S.A. Kotov, D.A. Kozhevnikov, U.G., Kruchonak, A.A. Nozdrin, S.Yu. Porokhovoy, I.N. Potrap, P.I. Smolyanskiy,, M.M. Zakhvatkin, A.S. Zhemchugov
TL;DR
This paper presents an iterative per-pixel calibration method for hybrid pixel detectors with GaAs:Cr sensors and Timepix readout, achieving high energy resolution at specific X-ray energies.
Contribution
The paper introduces a novel iterative calibration technique using characteristic X-ray spectra for improved energy resolution in hybrid pixel detectors.
Findings
Achieved 8% energy resolution at 60 keV
Achieved 13% energy resolution at 20 keV
Demonstrated effective per-pixel calibration process
Abstract
This paper describes an iterative method of per-pixel energy calibration of hybrid pixel detectors with GaAs:Cr sensor and Timepix readout chip. A convolution of precisely measured spectra of characteristic X-rays of different metals with the resolution and the efficiency of the pixel detector is used for the calibration. The energy resolution of the detector is also measured during the calibration. The use of per-pixel calibration allows to achieve a good energy resolution of the Timepix detector with GaAs:Cr sensor: 8% and 13% at 60 keV and 20 keV, respectively.
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