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Spectral calibration and modeling of the NuSTAR CdZnTe pixel detectors

Kitaguchi, Takao and Grefenstette, Brian W. and Harrison, Fiona A. and Miyasaka, Hiromasa and Bhalerao, Varun B. and Cook, Walter R., III and Mao, Peter H. and Rana, Vikram R. and Boggs, Steven E. and Zoglauer, Andreas C. (2011) Spectral calibration and modeling of the NuSTAR CdZnTe pixel detectors. In: UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVII. Proceedings of SPIE. No.8145. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 814507. ISBN 978-0-8194-8755-1.

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The Nuclear Spectroscopic Telescope Array (NuSTAR) will be the first space mission to focus in the hard X-ray (5-80 keV) band. The NuSTAR instrument carries two co-aligned grazing incidence hard X-ray telescopes. Each NuSTAR focal plane consists of four 2 mm CdZnTe hybrid pixel detectors, each with an active collecting area of 2 cm x 2 cm. Each hybrid consists of a 32x32 array of 605 μm pixels, read out with the Caltech custom low-noise NuCIT ASIC. In order to characterize the spectral response of each pixel to the degree required to meet the science calibration requirements, we have developed a model based on Geant4 together with the Shockley-Ramo theorem customized to the NuSTAR hybrid design. This model combines a Monte Carlo of the X-ray interactions with subsequent charge transport within the detector. The combination of this model and calibration data taken using radioactive sources of ^(57)Co, ^(155)Eu and ^(241)Am enables us to determine electron and hole mobility-lifetime products for each pixel, and to compare actual to ideal performance expected for defect-free material.

Item Type:Book Section
Related URLs:
URLURL TypeDescription Paper
Grefenstette, Brian W.0000-0002-1984-2932
Harrison, Fiona A.0000-0003-2992-8024
Miyasaka, Hiromasa0000-0002-8074-4186
Bhalerao, Varun B.0000-0002-6112-7609
Rana, Vikram R.0000-0003-1703-8796
Boggs, Steven E.0000-0001-9567-4224
Additional Information:© 2011 SPIE Society of Photo-Optical Instrumentation Engineers. This work was supported under NASA Contract NNG08FD60C. T.K. is supported by JSPS postdoctoral fellowships for research abroad. We thank Csaba Szeles for useful discussions.
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
Subject Keywords:X-ray, γ-ray, CdZnTe, pixel detector, Monte-Carlo simulation
Series Name:Proceedings of SPIE
Issue or Number:8145
Record Number:CaltechAUTHORS:20161101-075245752
Persistent URL:
Official Citation:Takao Kitaguchi ; Brian W. Grefenstette ; Fiona A. Harrison ; Hiromasa Miyasaka ; Varun B. Bhalerao ; Walter R. Cook III ; Peter H. Mao ; Vikram R. Rana ; Steven E. Boggs ; Andreas C. Zoglauer; Spectral calibration and modeling of the NuSTAR CdZnTe pixel detectors. Proc. SPIE 8145, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVII, 814507 (September 13, 2011); doi:10.1117/12.896972.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71647
Deposited By: Ruth Sustaita
Deposited On:01 Nov 2016 17:37
Last Modified:11 Nov 2021 04:48

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