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26 April 2024 |
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GRAPE - A Balloon-Borne Gamma-Ray Polarimeter Experiment | | P. F. Bloser
; J. S. Legere
; J. R. Macri
; M. L. McConnell
; T. Narita
; J. M. Ryan
; | | Date: |
14 Aug 2005 | | Subject: | astro-ph | | Abstract: | This paper reviews the development status of GRAPE (the Gamma-Ray Polarimeter Experiment), a hard X-ray Compton Polarimeter. The purpose of GRAPE is to measure the polarization of hard X-rays in the 50-300 keV energy range. We are particularly interested in X-rays that are emitted from solar flares and gamma-ray bursts (GRBs), although GRAPE could also be employed in the study of other astrophysical sources. Accurately measuring the polarization of the emitted radiation will lead to a better understating of both emission mechanisms and source geometries. The GRAPE design consists of an array of plastic scintillators surrounding a central high-Z crystal scintillator. The azimuthal distribution of photon scatters from the plastic array into the central calorimeter provides a measure of the polarization fraction and polarization angle of the incident radiation. The design of the detector provides sensitivity over a large field-of-view (>pi steradian). The design facilitates the fabrication of large area arrays with minimal deadspace. This paper presents the latest design concept and the most recent results from laboratory tests of a GRAPE science model. | | Source: | arXiv, astro-ph/0508314 | | Services: | Forum | Review | PDF | Favorites | |
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