The Spectrometer SPI on INTEGRAL
SPI is a coded-mask telescope with a 19-element Germanium
solid-state detector camera and a massive anticoincidence shield of BGO
scintillation detectors. Detectors are maintained at ~90K through
Stirling coolers. The spectral resolution is fine enough to resolve
astrophysical lines and allow spectroscopy in the regime of gamma-rays.
The coded mask provides imaging at moderate resolution.
Science objectives are nucleosynthesis, relativistic-particle
accelerators, and strong-field signatures in compact stars; this is
through nuclear lines and spectral features in accreting binaries,
or solar flares, but also through energetic continuum radiation in the
20 keV - 10 MeV range from the variety of cosmic sources, including AGN
and gamma-ray bursts.
SPI is a collaborative international project, with CESR
Toulouse and MPE as PI-Institutes (CESR Co-PI Jean-Pierre Roques, MPE
Co-PI Roland Diehl). CESR provided the Ge Camera, and coordinated the
overall instrument assembly with CNES as main industry contractor. The
the anticoincidence system ('ACS') of SPI, the GACE institute at the
University of Valencia provided the coded mask, and CEA Saclay the
electronics systems. Instrument operations are managed by the
CESR group (J.P. Roques), the ACS performance is optimized by MPE
(A.von Kienlin). Data processing and initial analysis is
for INTEGRAL at the ISDC, with secondary processing pipelines and
databases at CESR and MPE.
Last update: 2006-10-26 by R.
Authorized by R. Diehl & J.P. Roques (SPI Co-PIs)