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Development of focal plane detectors for the Nuclear Spectroscopic Telescope Array (NuSTAR) mission

Rana, Vikram R. and Cook, Walter R., III and Harrison, Fiona A. and Mao, Peter H. and Miyasaka, Hiromasa (2009) Development of focal plane detectors for the Nuclear Spectroscopic Telescope Array (NuSTAR) mission. In: UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVI. Proceedings of SPIE. No.7435. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 743503. ISBN 9780819477255. https://resolver.caltech.edu/CaltechAUTHORS:20180108-152953449

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Abstract

The Nuclear Spectroscopic Telescope Array (NuSTAR), scheduled for launch in 2011, is a NASA Small Explorer mission that will improve the current sensitivity for detection of faint astrophysical sources in the 6-80 keV band by two orders of magnitude. NuSTAR achieves high sensitivity by utilizing a hard X-ray focusing system. We have developed Cadmium Zinc Telluride (CdZnTe) pixel detectors optimized for good energy for the NuSTAR focal plane. Each of NuSTAR's two focal planes is comprised of hybrid detectors that consist of a CdZnTe pixel sensor with the anode contacts directly attached to corresponding readout circuits integrated on a custom low-noise VLSI chip. Each hybrid is 20.5 x 20.5 x 2.0 mm in size with the anode divided into 32 x 32 array of pixels at 0.6048 mm. In this paper we describe the hybrid sensor architecture, and present preliminary results from the characterization of detectors fabricated for the NuSTAR focal plane Engineering Test Unit (ETU). We achieve excellent electronic readout noise with an average of 250 eV FWHM, and energy resolution between 0.9 and 1.6 keV FWHM at 86.5 keV, depending on position in the sensor and improving at lower energies. In order to achieve the best spectral resolution we need to make pixeldependent corrections for events with charge split among multiple pixels, and in addition we make spectral corrections based on depth of the gamma-ray interaction.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.825418DOIArticle
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/7435/1/Development-of-focal-plane-detectors-for-the-Nuclear-Spectroscopic-Telescope/10.1117/12.825418.fullPublisherArticle
ORCID:
AuthorORCID
Rana, Vikram R.0000-0003-1703-8796
Harrison, Fiona A.0000-0003-2992-8024
Additional Information:© 2009 SPIE. This work was supported by the NASA APRA program under grant NAG and under the NASA NuSTAR contract, NNG06WC20G.
Group:NuSTAR, Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANNG06WC20G
Subject Keywords:Hard X-ray astrophysics, pixilated CdZnTe detectors, electronic noise and spectral performance, NuSTAR
Series Name:Proceedings of SPIE
Issue or Number:7435
Record Number:CaltechAUTHORS:20180108-152953449
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180108-152953449
Official Citation:Vikram R. Rana, Walter R. Cook, Fiona A. Harrison, Peter H. Mao, Hiromasa Miyasaka, "Development of focal plane detectors for the Nuclear Spectroscopic Telescope Array (NuSTAR) mission", Proc. SPIE 7435, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVI, 743503 (3 September 2009); doi: 10.1117/12.825418; http://dx.doi.org/10.1117/12.825418
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84176
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Jan 2018 23:46
Last Modified:03 Oct 2019 19:15

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