High sensitivity balloon-borne hard X-ray/soft Gamma-Ray Polarimeter PoGOLite
2007 (English)In: Nuclear Science Symposium Conference Record, 2007. NSS ’07. IEEE, IEEE , 2007, Vol. 4, 2538-2544 p.Conference paper (Refereed)
The Polarized Gamma-ray Observer - Lightweight version (PoGOLite) is a new balloon experiment capable of detecting 10% polarization from a 200 mCrab source in the 25-80 keV energy range in a single 6-hour flight for the first time. Polarization measurements of hard X-rays and soft gamma-rays are expected to provide a powerful probe into high-energy emission mechanisms as well as source geometries. PoGOLite uses Compton scattering and photo-absorption to measure polarization in an array of 217 well-type phoswich detector cells made of plastic and BGO scintillators. The adoption of a well-type phoswich counter concept and a thick polyethylene neutron shield provides a narrow field-of-view (1.25 msr), a large effective area ( gt; 250 cm2 at 40-50 keV), a high modulation factor (more than 25%) and the low background ( 100 mCrab) required to conduct high-sensitivity polarization measurements. Through tests in laboratories and accelerator facilities of a scaled-down prototype with the front-end electronics of flight design and an extensive study by Monte Carlo simulation, we have demonstrated high instrument performance. PoGOLite will be ready for a first engineering flight in 2009 and a science flight in 2010, during which polarization signals from the Crab Nebula/pulsar, Cygnus X-1 and other objects will be observed.
Place, publisher, year, edition, pages
IEEE , 2007. Vol. 4, 2538-2544 p.
, IEEE Nuclear Science Symposium Conference Record, ISSN 1095-7863 ; 4
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:kth:diva-80121DOI: 10.1109/NSSMIC.2007.4436669ISI: 000257380401259ScopusID: 2-s2.0-48149109282ISBN: 978-1-4244-0922-8OAI: oai:DiVA.org:kth-80121DiVA: diva2:496006
2007 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS-MIC; Honolulu, HI; 27 October 2007 through 3 November 2007
QC 201203012012-02-092012-02-092012-03-01Bibliographically approved