TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN
Online ISSN : 1884-0485
ISSN-L : 1884-0485
m) Scientific Observations and Related Technologies
The Polarized Gamma-Ray Observer, PoGOLite
Hiromitsu TAKAHASHI, Masayuki MATSUOKA, Yudai UMEKI, Hiroaki YOSHIDA, Takuya TANAKA, Tsunefumi MIZUNO, Yasushi FUKAZAWA, Tuneyoshi KAMAE, Grzegorz MADEJSKI, Hiroyasu TAJIMA, Mózsi KISS, Wlodzimierz KLAMRA, Stefan LARSSON, Cecilia MARINI BETTOLO, Mark PEARCE, Felix RYDE, Stefan RYDSTRÖM, Kohei KURITA, Yoshikazu KANAI, Makoto ARIMOTO, Masaru UENO, Jun KATAOKA, Nobuyuki KAWAI, Magnus AXELSSON, Linnea HJALMARSDOTTER, Gilles BOGAERT, Shuichi GUNJI, Jun'ichiro KATSUTA, Tadayuki TAKAHASHI, Gary VARNER, Takayuki YUASA
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Keywords: Balloon Experiment, Polarization Measurement, Hard X-Ray, Soft Gamma-Ray, SpaceWire Interface
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2010 Volume 8 Issue ists27 Pages Pm_1-Pm_5

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Abstract

The Polarized Gamma-ray Observer, PoGOLite, is a balloon experiment with the capability of detecting 10% polarization from a 200 mCrab celestial object in the energy-range 25–80 keV. During a beam test at KEK-PF in 2008, 19 detector units and one anti-coincidence detector were assembled, and a 50 keV X-ray beam with a polarization degree of ∼90% was irradiated at the center unit. Signals from all 20 units were fed into flight-version electronics consisting of six circuit boards (four waveform digitizer boards, one digital I/O board and one router board) and one microprocessor (SpaceCube), which communicate using a SpaceWire interface. One digitizer board, which can associate up to 8 detectors, outputs a trigger signal. The digital I/O board handles the trigger and returns a data acquisition request if there is no veto signal (upper or pulse-shape discriminators) from any detector unit. This data acquisition system worked well, and the modulation factor was successfully measured to be ∼34%. These results confirmed the capabilities of the data-acquisition system for a “pathfinder” flight planned in 2010.

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© 2010 The Japan Society for Aeronautical and Space Sciences
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