Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-06-30
Exp.Ast.22:109-128,2008
Astronomy and Astrophysics
Astrophysics
Experimental Astronomy, 2008, in press
Scientific paper
10.1007/s10686-008-9110-0
The effects of the in-flight behaviour of the bolometer arrays of the Herschel/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.
Andreani P. M.
Bongardo C.
Claret Antonio
de Zotti Gianfranco
Giannitrapani Riccardo
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