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We present results of simulations performed with the Geant4 software code ofthe effects of Galactic Cosmic Ray impacts on the photoconductor arrays of thePACS instrument. This instrument is part of the ESA-Herschel payload, whichwill be launched in late 2007 and will operate at the Lagrangian L2 point ofthe Sun-Earth system. Both the Satellite plus the cryostat (the shield) and thedetector act as source of secondary events, affecting the detector performance.Secondary event rates originated within the detector and from the shield are ofcomparable intensity. The impacts deposit energy on each photoconductor pixelbut do not affect the behaviour of nearby pixels. These latter are hit with aprobability always lower than 7%. The energy deposited produces a spike whichcan be hundreds times larger than the noise. We then compare our simulationswith proton irradiation tests carried out for one of the detector modules andfollow the detector behaviour under 'real' conditions.

Simulations of Galactic Cosmic Ray impacts onto the Herschel/PACS photoconductor arrays with Geant4 code