Performance of 8<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e320" altimg="si9.svg"><mml:mrow><mml:mo>×</mml:mo><mml:mn>8</mml:mn><mml:mo>×</mml:mo></mml:mrow></mml:math>32 and 10<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e330" altimg="si10.svg"><mml:mrow><mml:mo>×</mml:mo><mml:mn>10</mml:mn><mml:mo>×</mml:mo></mml:mrow></mml:math>32 mm3 CdZnTe position-sensitive virtual Frisch-grid detectors for high-energy gamma ray cameras

Bolotnikov, A. E.; Mackenzie, J.; Chen, E.; Kumar, F. Joseph; Taherion, Saeid; Carini, G.; Geronimo, G. De; Fried, J.; Kım, Kihyun; Girado, L. Ocampo; Vernon, E.; James, R. B.

doi:10.1016/j.nima.2020.164005

Cited by 11 publications

(2 citation statements)

References 9 publications

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“…Pixelated detectors 6 and orthogonal stripes detectors 7,8 allow to neglect the hole contribution to the signal thanks to the "small pixel effect", but they are unsuitable in the aforementioned applications due to the expensive readout tools. Coplanar 9 and Virtual Frisch-Grid (VFG) 10 detectors allow to exploit large volumes of CdZnTe with few electronic channels. However, both geometries are characterised by large parasitic capacitance.…”

Section: Optimization Of Quasi-hemispherical Cdznte Detectors By Mean...mentioning

confidence: 99%

Optimization of quasi-hemispherical CdZnTe detectors by means of first principles simulation

Vicini

Zanettini²,

Amadé³

et al. 2023

Sci Rep

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In this paper we present the development of quasi-hemispherical gamma-ray detectors based on CdZnTe. Among the possible single-polarity electrode configurations, such as coplanar, pixelated, or virtual Frisch-grid geometries, quasi-hemispherical detectors are the most cost-effective alternative with comparable raw energy resolution in the high and low energy range. The optimal configuration of the sensor in terms of dimension of the crystals and electrode specifications has been first determined by simulations, and successively validated with experimental measures. Spectra from different sources have been acquired to evaluate the detectors performances. Three types of detectors with different CZT volumes have been fabricated, namely 10 × 10 × 5 mm3, 15 × 15 × 10 mm3 and 20 × 20 × 10 mm3. In the case of 10 × 10 × 5 mm3 crystals, the optimum pixel size determined by our simulation tool was confirmed by experiments: the best spectroscopic resolution of 1.3% at 662 keV has been found for a 750 μm diameter pixel detector. The best energy resolution values obtained for the 15 × 15 × 10 mm3 and 20 × 20 × 10 mm3 detectors were respectively 1.7% and 2.7% at 662 keV.

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Section: Optimization Of Quasi-hemispherical Cdznte Detectors By Mean...mentioning

confidence: 99%

Optimization of quasi-hemispherical CdZnTe detectors by means of first principles simulation

Vicini

Zanettini²,

Amadé³

et al. 2023

Sci Rep

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“…This work presents the development of a thallium-doped cesium iodide (CsI:Tl) based calorimeter in support of the ComPair balloon-based telescope [8], which serves as a prototype to AMEGO and will be flown in the summer of 2023. The AMEGO concept consists of four subsystems: the double-sided Silicon strip detectors (DSSD) [9], virtual Frisch-grid CdZnTe calorimeter [10], CsI calorimeter, and a plastic-based anti-coincidence detector (ACD) [8]. The main concept behind this 'hybrid' telescope design is to maintain high detection sensitivity and good imaging performance through a large energy range that includes the Compton and pair-creation region.…”

Section: Introductionmentioning

confidence: 99%

Development of the ComPair gamma-ray telescope prototype

Shy¹,

Kierans

Cannady

et al. 2022

Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray

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There is a growing interest in the science uniquely enabled by observations in the MeV range, particularly in light of multi-messenger astrophysics. The Compton Pair (ComPair) telescope, a prototype of the AMEGO Probe-class concept, consists of four subsystems that together detect and characterize gamma rays in the MeV regime. A double-sided strip silicon Tracker gives a precise measure of the first Compton scatter interaction and tracks pair-conversion products. A novel cadmium zinc telluride (CZT) detector with excellent position and energy resolution beneath the Tracker detects the Compton-scattered photons. A thick cesium iodide (CsI) calorimeter contains the high-energy Compton and pair events. The instrument is surrounded by a plastic anticoincidence (ACD) detector to veto the cosmic-ray background. In this work, we will give an overview of the science motivation and a description of the prototype development and performance.

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