Characterization of a 5 mm thick CZT-Timepix3 pixel detector for energy-dispersive γ-ray and particle tracking

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F24%3A00371935" target="_blank" >RIV/68407700:21670/24:00371935 - isvavai.cz</a>

Alternative codes found

RIV/49777513:23220/24:43971658

Result on the web

<a href="https://doi.org/10.1088/1402-4896/ad10dd" target="_blank" >https://doi.org/10.1088/1402-4896/ad10dd</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1402-4896/ad10dd" target="_blank" >10.1088/1402-4896/ad10dd</a>

Result language

angličtina

Original language name

Characterization of a 5 mm thick CZT-Timepix3 pixel detector for energy-dispersive γ-ray and particle tracking

Original language description

The present manuscript describes a comprehensive characterization of a novel highly segmented 5 mm CZT sensor attached to Timepix3. First, the sensor's IV curve was measured and basic sensor characterization was done with laboratory gamma-radiation sources. The sensor resistivity was determined to be (0.155 +/- 0.02) GOhm <middle dot> cm. The sensor showed decent homogeneity, both for the per-pixel count rate and electron mobility-lifetime product mu e tau e. The latter was measured to be = 1.3 x 10(-3) cm2/V with a standard deviation sigma = 0.4 x 10(-3) cm(2)/V describing the dispersion of values for different pixels. The basic sensor characterization is complemented by measurements at grazing angle in a 120 GeV/c at the CERN's Super Proton Synchrotron. The penetrating nature of these particles together with the pixelation of the sensor allows for a determination of the charge collection efficiency (CCE), as well as charge carrier drift properties (drift times, lateral charge cloud expansion) as a function of the interaction depths in the sensor. While CCE drops by 30%-40% towards the cathode side of the sensor, from the drift time dependency on interaction depth, the electron mobility mu e was extracted to be (944.8 +/- 1.3) cm(2)/V/s and tau e = (1.38 +/- 0.31) mu s. The spectroscopic performance was assessed in photon fields and extracted from energy loss spectra measured at different angles in the pion beam. While at photon energies below 120 keV incomplete charge collection leads to an underestimation of the photon energy when irradiated from the front side, at higher energies the relative energy resolution was found to be -4.5%, while a relative energy resolution of -7.5% was found for the particle energy loss spectra. It is shown that the drift time information can be used to reconstruct particle interactions in the sensor in 3D, providing a spatial resolution of sigma xyz = 241 mu m within the sensor volume and a particle trajectory measurement precision Delta(xyz) = 100 mu m, at a distance of 1 m from the sensor. We demonstrate by measurement with a 22Na source, that the energy resolution combined with the 3D reconstruction allows for detection of gamma-ray source location and polarity using Compton scattering within the sensor (Compton camera and scatter polarimeter).

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10304 - Nuclear physics

Project

<a href="/en/project/GM23-04869M" target="_blank" >GM23-04869M: Particle identification in high-energy physics experiments and space with advanced detection systems</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physica Scripta

ISSN

0031-8949

e-ISSN

1402-4896

Volume of the periodical

99

Issue of the periodical within the volume

1

Country of publishing house

SE - SWEDEN

Number of pages

15

Pages from-to

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UT code for WoS article

001126367700001

EID of the result in the Scopus database

2-s2.0-85180270033