First calibration measurements with the dust impact detector DIDSY-IPM |
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Authors: | E Grün E Bussoletti A Minafra H Kuczera JAM McDonell |
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Institution: | Max-Planck-Institut für Kernphysik, Postfach 10 39 80, 6900 Heidelberg, FRG;Physic Department, University of Lecce, 73100, Lecce, Italy;Istituto di Fisica, University of Bari, 70126 Bari, Italy;Institut für Raumfahrttechnik, TU-München, 8000 München, FRG;Space Research Laboratory, University of Kent, Canterbury, Kent, CTZ 7 NT, UK |
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Abstract: | The IPM detector consists of two separate impact ionization detectors, one of them covered by a 2.5 μm thick plastic film and a piezoelectric sensor mounted to the back of the joint impact plate. First impact tests, with iron projectiles in the mass range 10?15 to 10?9 g and in the speed range 1 km/s to 70 km/s, were performed with the calibration (FS) and the flight (F) model of this detector. The charge yield at 69 km/s impact speed (flyby speed of GIOTTO) has been extrapolated from the data and amounts to 400 Coulombs per gram. This corresponds to a preliminary sensitivity threshold for the impact ionization detector of about 6×10?17 g. The penetration limit introduced by the plastic film is about 10?14 g for iron particles. Only the biggest particles used for the test produced signals at the piezoelectric sensor. If one assumes an energy dependence of the piozoelectric signal, a preliminary sensitivity threshold of about 10?13 g at 69 km/s can be established. |
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