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Proceedings Paper

Positional calibrations of the germanium double sided strip detectors for the Compton spectrometer and imager
Author(s): A. Lowell; S. Boggs; J. L. Chiu; C. Kierans; S. McBride; C. H. Tseng; A. Zoglauer; M. Amman; H. K. Chang; P. Jean; C. H. Lin; C. Sleator; J. Tomsick; P. von Ballmoos; C. Y. Yang
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Paper Abstract

The Compton Spectrometer and Imager (COSI) is a medium energy gamma ray (0.2 - 10 MeV) imager designed to observe high-energy processes in the universe from a high altitude balloon platform. At its core, COSI is comprised of twelve high purity germanium double sided strip detectors which measure particle interaction energies and locations with high precision. This manuscript focuses on the positional calibrations of the COSI detectors. The interaction depth in a detector is inferred from the charge collection time difference between the two sides of the detector. We outline our previous approach to this depth calibration and also describe a new approach we have recently developed. Two dimensional localization of interactions along the faces of the detector (x and y) is straightforward, as the location of the triggering strips is simply used. However, we describe a possible technique to improve the x/y position resolution beyond the detector strip pitch of 2 mm. With the current positional calibrations, COSI achieves an angular resolution of 5.6 ± 0.1 degrees at 662 keV, close to our expectations from simulations.

Paper Details

Date Published: 1 August 2016
PDF: 10 pages
Proc. SPIE 9915, High Energy, Optical, and Infrared Detectors for Astronomy VII, 99152H (1 August 2016); doi: 10.1117/12.2233145
Show Author Affiliations
A. Lowell, Univ. of California, Berkeley (United States)
S. Boggs, Univ. of California, Berkeley (United States)
J. L. Chiu, Univ. of California, Berkeley (United States)
C. Kierans, Univ. of California, Berkeley (United States)
S. McBride, Univ. of California, Berkeley (United States)
C. H. Tseng, National Tsing Hua Univ. (Taiwan)
A. Zoglauer, Univ. of California, Berkeley (United States)
M. Amman, Lawrence Berkeley National Lab. (United States)
H. K. Chang, National Tsing Hua Univ. (Taiwan)
P. Jean, Institut de Recherche en Astrophysique et Planétologie (France)
C. H. Lin, Institute of Physics, Academica Sinica (Taiwan)
C. Sleator, Univ. of California, Berkeley (United States)
J. Tomsick, Univ. of California, Berkeley (United States)
P. von Ballmoos, Institut de Recherche en Astrophysique et Planétologie (France)
C. Y. Yang, National Tsing Hua Univ. (Taiwan)


Published in SPIE Proceedings Vol. 9915:
High Energy, Optical, and Infrared Detectors for Astronomy VII
Andrew D. Holland; James Beletic, Editor(s)

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