Computer Science – Performance
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552..761a&link_type=abstract
Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific
Computer Science
Performance
Scientific paper
Calibration measurements of the MEGA (Medium Energy Gamma-ray Astronomy) prototype have been performed with radioactive lab sources and at the High Intensity Gamma-ray Source (HIGS) at the Free Electron Laser Laboratory (FELL) of Duke University, Durham, NC. MEGA is a combined Compton scatter and pair creation telescope. It con- sists of two main detector units, the tracker and the calorimeter. Doublesided Silicon strip detectors form the tracker, which is surrounded by the pixelated CsI(Tl) blocks of the calorimeter. A prerequisite for successful data analysis is a calibration of each indi- vidual readout channel. This work is still ongoing. The performance of the detector units will be there- fore presented as currently known. The encountered problems and the resulting (single detector) calibra- tion methods will be described briefly. Since we aim at an energy range of 0.3 50 MeV, the HIGS — a Compton back-scattering source — with beams of mono-energetic, fully linearly polarized photons in the range of 0.7 50 MeV was a good match for the MEGA calibration. Measurements at various ener- gies and for different incidence angles have been per- formed. Some preliminary results will be presented. Key words: Compton telescope; pair telescope; Si strip detector; CsI calorimeter; γ-ray; HIGS.
Andritschke Robert
Bloser Peter F.
Hunter Stan D.
Kanbach Gottfried
Litvinenko Vladimir N.
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