Ground calibrations of Nuclear Compton Telescope

Jeng-Lun Chiu; Zhong-Kai Liu; Mark S. Bandstra; Eric C. Bellm; Jau-Shian Liang; Daniel Perez-Becker; Andreas Zoglauer; Steven E. Boggs; Hsiang-Kuang Chang; Yuan-Hann Chang; Minghuey A. Huang; Mark Amman; Shiuan-Juang Chiang; Wei-Che Hung; Chih-Hsun Lin; Paul N. Luke; Ray-Shine Run; Cornelia B. Wunderer

doi:10.1117/12.857876

29 July 2010 Ground calibrations of Nuclear Compton Telescope

Jeng-Lun Chiu, Zhong-Kai Liu, Mark S. Bandstra, Eric C. Bellm, Jau-Shian Liang, Daniel Perez-Becker, Andreas Zoglauer, Steven E. Boggs, Hsiang-Kuang Chang, Yuan-Hann Chang, Minghuey A. Huang, Mark Amman, Shiuan-Juang Chiang, Wei-Che Hung, Chih-Hsun Lin, Paul N. Luke, Ray-Shine Run, Cornelia B. Wunderer

Author Affiliations +

Proceedings Volume 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray; 77324H (2010) https://doi.org/10.1117/12.857876
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

The Nuclear Compton Telescope (NCT) is a balloon-borne soft gamma ray (0.2-10 MeV) telescope designed to study astrophysical sources of nuclear line emission and polarization. The heart of NCT is an array of 12 cross-strip germanium detectors, designed to provide 3D positions for each photon interaction with full 3D position resolution to < 2 mm^3. Tracking individual interactions enables Compton imaging, effectively reduces background, and enables the measurement of polarization. The keys to Compton imaging with NCT's detectors are determining the energy deposited in the detector at each strip and tracking the gamma-ray photon interaction within the detector. The 3D positions are provided by the orthogonal X and Y strips, and by determining the interaction depth using the charge collection time difference (CTD) between the anode and cathode. Calibrations of the energy as well as the 3D position of interactions have been completed, and extensive calibration campaigns for the whole system were also conducted using radioactive sources prior to our flights from Ft. Sumner, New Mexico, USA in Spring 2009, and from Alice Springs, Australia in Spring 2010. Here we will present the techniques and results of our ground calibrations so far, and then compare the calibration results of the effective area throughout NCT's field of view with Monte Carlo simulations using a detailed mass model.

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Jeng-Lun Chiu, Zhong-Kai Liu, Mark S. Bandstra, Eric C. Bellm, Jau-Shian Liang, Daniel Perez-Becker, Andreas Zoglauer, Steven E. Boggs, Hsiang-Kuang Chang, Yuan-Hann Chang, Minghuey A. Huang, Mark Amman, Shiuan-Juang Chiang, Wei-Che Hung, Chih-Hsun Lin, Paul N. Luke, Ray-Shine Run, and Cornelia B. Wunderer "Ground calibrations of Nuclear Compton Telescope", Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77324H (29 July 2010); https://doi.org/10.1117/12.857876

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