Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nimpa.279..611s&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section A, Volume 279, Issue 3, p. 611-624.
Physics
12
Scientific paper
Our earlier laboratory investigations of polyvinylidene fluoride (PVDF) dust detectors - which we developed for cometary and interplanetary dust studies - were limited to dust mass and velocity ranges of 10-13-10-10 g, and 1-12 km/s, respectively. These measurements established a unique dependence of detector signal amplitude on particle mass and velocity, namely mavb, where a = 1.3 and b = 3.0, respectively, for particles that stopped in thick (e.g. 28 μm) PVDF detectors. We have now extended our dust accelerator investigations to higher dust masses (~10-9-10-6 g) in the same velocity range so that the dust particles fully penetrate a wide range of PVDF detector thicknesses, including the 28 μm thick detectors we employed for our Comet Halley dust coma measurements. For these penetrating particles we show that the values of a and b are 0.90+/-0.05 and 1.05+/-0.05, respectively. We also report, for the first time, the measurement of crater sizes in the detector for these penetrating particles and the correlated detector signal amplitude and pulse shape. From these simultaneous measurements we have proved that the basic response mechanism is irreversible depolarization in the PVDF detector, as we had proposed earlier. These new laboratory investigations also were arranged to determine particle fragmentation and particle (and fragment) velocity after detector penetration by time-of-flight measurements. We discuss the bearing of these studies on our interpretation of measured Comet Halley dust coma mass spectra.
Rabinowitz David
Simpson André J.
Tuzzolino Anthony J.
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