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Proceedings Paper

Data acquisition system and ground calibration of polarized gamma-ray observer (PoGOLite)
Author(s): Hiromitsu Takahashi; Maxime Chauvin; Yasushi Fukazawa; Miranda Jackson; Tuneyoshi Kamae; Takafumi Kawano; Mozsi Kiss; Merlin Kole; Victor Mikhalev; Tsunefumi Mizuno; Elena Moretti; Mark Pearce; Stefan Rydström
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Paper Abstract

The Polarized Gamma-ray Observer, PoGOLite, is a balloon experiment with the capability of detecting 10% polarization from a 200 mCrab celestial object between the energy-range 25–80 keV in one 6 hour flight. Polarization measurements in soft gamma-rays are expected to provide a powerful probe into high-energy emission mechanisms in/around neutron stars, black holes, supernova remnants, active-galactic nuclei etc. The “pathfinder” flight was performed in July 2013 for 14 days from Sweden to Russia. The polarization is measured using Compton scattering and photoelectric absorption in an array of 61 well-type phoswich detector cells (PDCs) for the pathfinder instrument. The PDCs are surrounded by 30 BGO crystals which form a side anti-coincidence shield (SAS) and passive polyethylene neutron shield. There is a neutron detector consisting of LiCaAlF6 (LiCAF) scintillator covered with BGOs to measure the background contribution of atmospheric neutrons. The data acquisition system treats 92 PMT signals from 61 PDCs + 30 SASs + 1 neutron detector, and it is developed based on SpaceWire spacecraft communication network. Most of the signal processing is done by digital circuits in Field Programmable Gate Arrays (FPGAs). This enables the reduction of the mass, the space and the power consumption. The performance was calibrated before the launch.

Paper Details

Date Published: 31 July 2014
PDF: 7 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91444I (31 July 2014); doi: 10.1117/12.2056723
Show Author Affiliations
Hiromitsu Takahashi, Hiroshima Univ. (Japan)
Maxime Chauvin, KTH Royal Institute of Technology (Sweden)
AlbaNova Univ. Ctr. (Sweden)
Yasushi Fukazawa, Hiroshima Univ. (Japan)
Miranda Jackson, KTH Royal Institute of Technology (Sweden)
AlbaNova Univ. Ctr. (Sweden)
Tuneyoshi Kamae, The Univ. of Tokyo (Japan)
Takafumi Kawano, Hiroshima Univ. (Japan)
Mozsi Kiss, KTH Royal Institute of Technology (Sweden)
AlbaNova Univ. Ctr. (Sweden)
Merlin Kole, KTH Royal Institute of Technology (Sweden)
AlbaNova Univ. Ctr. (Sweden)
Victor Mikhalev, KTH Royal Institute of Technology (Sweden)
AlbaNova Univ. Ctr. (Sweden)
Tsunefumi Mizuno, Hiroshima Univ. (Japan)
Elena Moretti, KTH Royal Institute of Technology (Sweden)
AlbaNova Univ. Ctr. (Sweden)
Mark Pearce, KTH Royal Institute of Technology (Sweden)
AlbaNova Univ. Ctr. (Sweden)
Stefan Rydström, KTH Royal Institute of Technology (Sweden)
AlbaNova Univ. Ctr. (Sweden)


Published in SPIE Proceedings Vol. 9144:
Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz, Editor(s)

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