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Neutron background detection for a hard X-ray balloon-borne polarimeter
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Kole, Merlin (author)
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Chauvin, Maxime (author)
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Fukazawa, Y. (author)
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Fukuda, K. (author)
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Ishizu, S. (author)
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- Jackson, Miranda (author)
- KTH,Fysik
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Kamae, T. (author)
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Kawaguchi, N. (author)
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Kawano, T. (author)
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- Kiss, Mózsi (author)
- KTH,Partikel- och astropartikelfysik
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- Mikhalev, Victor (author)
- KTH,Partikel- och astropartikelfysik
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Moretti, Elena (author)
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- Pearce, Mark (author)
- KTH,Partikel- och astropartikelfysik
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Rydström, Stefan (author)
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Takahashi, H. (author)
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Yanagida, T. (author)
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(creator_code:org_t)
- Proceedings of Science (PoS), 2014
- 2014
- English.
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In: Proceedings of Science. - : Proceedings of Science (PoS).
- Related links:
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http://www.tipp2014....
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https://urn.kb.se/re...
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Abstract
Subject headings
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- PoGOLite is a balloon-borne hard X-ray polarimeter. It determines polarisation by measuring the azimuthal angular distribution of Compton scattered photons in a plastic scintillator array. The use of an all-plastic target yields a relatively large, low-mass detection area. The dominant source of background for these measurements has been shown, through Geant4 simulations, to originate from high energy (MeV range) atmospheric neutrons. Neutrons can pass the instrument's Bismuth Germanium Oxide (BGO) anti-coincidence shield undetected and subsequently scatter between plastic scintillator elements to produce a polarisation signature. A passive 15 cm thick polyethylene shield surrounding the polarimeter reduces the neutron induced background by an order of magnitude. The background level remains however significant, prompting the need for active monitoring of the continuously changing neutron flux. For this purpose PoGOLite makes use of a phoswich scintillator cell. The phoswich cell consists of a 5 mm thick Lithium Calcium Aluminium Fluoride (LiCAF) scintillator, used for neutron detection. The LiCAF is surrounded by a BGO anti-coincidence system. This small light weight detector can therefore be used to measure the neutron flux even in high radiation environments. This type of neutron detector was tested on a separate dedicated stratospheric balloon mission in March 2013, called PoGOLino, prior to the PoGOLite flight which took place in July 2013. Results from the test flight and implications for the measurements performed on the PoGOLite flight will be discussed.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Angular distribution
- Balloons
- Germanium oxides
- Neutron detectors
- Neutron flux
- Polarimeters
- Polarization
- Scintillation counters
- Aluminium fluoride
- Anticoincidence shield
- Atmospheric neutrons
- Compton scattered photons
- High radiation environment
- Plastic scintillator
- Plastic scintillator arrays
- Stratospheric balloon
- Meteorological balloons
Publication and Content Type
- ref (subject category)
- kon (subject category)
To the university's database
- By the author/editor
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Kole, Merlin
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Chauvin, Maxime
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Fukazawa, Y.
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Fukuda, K.
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Ishizu, S.
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Jackson, Miranda
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show more...
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Kamae, T.
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Kawaguchi, N.
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Kawano, T.
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Kiss, Mózsi
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Mikhalev, Victor
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Moretti, Elena
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Pearce, Mark
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Rydström, Stefan
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Takahashi, H.
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Yanagida, T.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
- Articles in the publication
- Proceedings of S ...
- By the university
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Royal Institute of Technology