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Proceedings Paper

Ground calibrations of Nuclear Compton Telescope
Author(s): 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
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Paper 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.

Paper Details

Date Published: 29 July 2010
PDF: 9 pages
Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77324H (29 July 2010); doi: 10.1117/12.857876
Show Author Affiliations
Jeng-Lun Chiu, National Tsing Hua Univ. (Taiwan)
Zhong-Kai Liu, National Central Univ. (Taiwan)
Mark S. Bandstra, Univ. of California, Berkeley (United States)
Eric C. Bellm, Univ. of California, Berkeley (United States)
Jau-Shian Liang, National Tsing Hua Univ. (Taiwan)
Daniel Perez-Becker, Univ. of California, Berkeley (United States)
Andreas Zoglauer, Univ. of California, Berkeley (United States)
Steven E. Boggs, Univ. of California, Berkeley (United States)
Hsiang-Kuang Chang, National Tsing Hua Univ. (Taiwan)
Yuan-Hann Chang, National Central Univ. (Taiwan)
Minghuey A. Huang, National United Univ. (Taiwan)
Mark Amman, Lawrence Berkeley National Lab. (United States)
Shiuan-Juang Chiang, National United Univ. (Taiwan)
Wei-Che Hung, National Central Univ. (Taiwan)
Chih-Hsun Lin, Institute of Physics (Taiwan)
Paul N. Luke, Lawrence Berkeley National Lab. (United States)
Ray-Shine Run, National United Univ. (Taiwan)
Cornelia B. Wunderer, DESY Photon Science (Germany)

Published in SPIE Proceedings Vol. 7732:
Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Monique Arnaud; Stephen S. Murray; Tadayuki Takahashi, Editor(s)

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