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X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, Waikoloa : États-Unis
Calibration of the spectrometer aboard the INTEGRAL satellite
S. Schanne1, B. Cordier1, M. Gros1, D. Attie1, P. von Ballmoos2, L. Bouchet2, R. Carli, P. Connell, R. Diehl, P. Jean2, J. Kiener3, A. von Kienlin, J. Knoedlseder2, P. Laurent1, G.-G. Lichti, P. Mandrou2, J. C. Paul1, P. Paul2, J.-P. Roques2, F. Sanchez, V. Schoenfelder, C. Shrader, G.-K. Skinner2, A.-W. Strong, S.-J. Sturner, V. Tatischeff3, B.-J. Teegarden, G. Vedrenne2, G. Weidenspointner, C.-B. Wunderer

SPI, the Spectrometer on board the ESA INTEGRAL satellite, to be launched in October 2002, will study the gammaray sky in the 20 keV to 8 MeV energy band with a spectral resolution of 2 keV for photons of 1 MeV, thanks to its 19 germanium detectors spanning an active area of 500 cm2. A coded mask imaging technique provides a 2° angular resolution. The 16° field of view is defined by an active BGO veto shield, furthermore used for background rejection. In April 2001 the flight model of SPI underwent a one-month calibration campaign at CEA in Bruyères le Châtel using low intensity radioactive sources and the CEA accelerator for homogeneity measurements and high intensity radioactive sources for imaging performance measurements. After integration of all scientific payloads (the spectrometer SPI, the imager IBIS and the monitors JEM-X and OMC) on the INTEGRAL satellite, a cross-calibration campaign has been performed at the ESA center in Noordwijk. A set of sources has been placed in the field of view of the different instruments in order to compare their performances and determine their mutual influence. Some of those sources had already been used in Bruyères during the SPI standalone test. For the lowest energy band calibration an X-ray generator has been used. We report on the scientific goals of this calibration activity, and present the measurements performed as well as some preliminary results.
1 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 :  CESR - Centre d'étude spatiale des rayonnements
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique

Physique/Physique/Instrumentations et Détecteurs
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