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Proceedings Paper

Calibration of the hard x-ray detectors for the FOXSI solar sounding rocket
Author(s): P. S. Athiray; Juan Camilo Buitrago-Casas; Kendra Bergstedt; Juliana Vievering; Sophie Musset; Shin-nosuke Ishikawa; Lindsay Glesener; Tadayuki Takahashi; Shin Watanabe; Sasha Courtade; Steven Christe; Säm Krucker; Keith Goetz; Steven Monson
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Paper Abstract

The Focusing Optics X-ray Solar Imager (FOXSI) sounding rocket experiment conducts direct imaging and spectral observation of the Sun in hard X-rays, in the energy range 4 to 20 keV. These high-sensitivity observations are used to study particle acceleration and coronal heating. FOXSI is designed with seven grazing incidence optics modules that focus X-rays onto seven focal plane detectors kept at a 2m distance. FOXSI-1 was flown with seven Double-sided Si Strip Detectors (DSSD), and two of them were replaced with CdTe detectors for FOXSI-2. The upcoming FOXSI-3 flight will carry DSSD and CdTe detectors with upgraded optics for enhanced sensitivity. The detectors are calibrated using various radioactive sources. The detector’s spectral response matrix was constructed with diagonal elements using a Gaussian approximation with a spread (sigma) that accounts for the energy resolution of the detector. Spectroscopic studies of past FOXSI flight data suggest that the inclusion of lower energy X-rays could better constrain the spectral modeling to yield a more precise temperature estimation of the hot plasma. This motivates us to carry out an improved calibration to better understand the finer-order effects on the spectral response, especially at lower energies. Here we report our improved calibration of FOXSI detectors using experiments and Monte-Carlo simulations.

Paper Details

Date Published: 29 August 2017
PDF: 11 pages
Proc. SPIE 10397, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX, 103970A (29 August 2017); doi: 10.1117/12.2273915
Show Author Affiliations
P. S. Athiray, Univ. of Minnesota (United States)
Juan Camilo Buitrago-Casas, Univ. of California, Berkeley (United States)
Kendra Bergstedt, Univ. of Minnesota (United States)
Juliana Vievering, Univ. of Minnesota (United States)
Sophie Musset, Univ. of Minnesota (United States)
Shin-nosuke Ishikawa, Institute of Space and Astronautical Science (Japan)
Lindsay Glesener, Univ. of Minnesota (United States)
Tadayuki Takahashi, Institute of Space and Astronautical Science (Japan)
Univ. of Tokyo (Japan)
Shin Watanabe, Institute of Space and Astronautical Science (Japan)
Univ. of Tokyo (Japan)
Sasha Courtade, Univ. of California, Berkeley (United States)
Steven Christe, NASA Goddard Space Flight Ctr. (United States)
Säm Krucker, Univ. of California, Berkeley (United States)
Univ. of Applied Sciences and Arts Northwestern (Switzerland)
Keith Goetz, Univ. of Minnesota (United States)
Steven Monson, Univ. of Minnesota (United States)

Published in SPIE Proceedings Vol. 10397:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX
Oswald H. Siegmund, Editor(s)

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