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Simulations of galactic cosmic ray impacts on the Herschel/PACS bolometer arrays with Geant4 code |
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| Authors: | C Bongardo P M Andreani K Okumura B Horeau A Claret G De Zotti R Giannitrapani F Longo |
| Institution: | 1. INAF–Osservatorio Astronomico di Padova, Vicolo dell‘Osservatorio 5, 35122, Padova, Italy 2. European Southern Observatory, Karl Schwarzschild strasse 2, 85748, Garching near Munich, Germany 3. INAF–Osservatorio Astronomico di Trieste, via Tiepolo 11, 34143, Trieste, Italy 4. DSM/DAPNIA/SAp CEA–Saclay, Bat. 709, l‘Orme des Merisiers, 91191, Gif-sur-Yvette CEDEX, France 5. Università degli Studi di Udine, Via delle Scienze 208, 33100, Udine, Italy 6. Dipartimento di Fisica, Università degli Studi di Trieste e INFN sezione di Trieste, Via Valerio 2, 34127, Trieste, Italy |
| Abstract: | The effects of the in-flight behaviour of the bolometer arrays of the Herschel/Photo-conductor Array Camera and Spectrometer (PACS) instrument under impacts of Galactic cosmic rays are explored. This instrument is part of the ESA-Herschel payload, which will be launched at the end of 2008 and will operate at the Lagrangian L2 point of the Sun-Earth system. We find that the components external to the detectors (the spacecraft, the cryostat, the PACS box, collectively referred to as the ‘shield’) are the major source of secondary events affecting the detector behaviour. The impacts deposit energy on the bolometer chips and influence the behaviour of nearby pixels. 25% of hits affect the adjacent pixels. The energy deposited raises the bolometer temperature by a factor ranging from 1 to 6 percent of the nominal value. We discuss the effects on the observations and compare simulations with laboratory tests. |
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