Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4140..229s&link_type=abstract
Proc. SPIE Vol. 4140, p. 229-236, X-Ray and Gamma-Ray Instrumentation for Astronomy XI, Kathryn A. Flanagan; Oswald H. Siegmund;
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The ROSINA-RTOF experiment on the ROSETTA satellite is designed to measure the elemental, isotopic and molecular composition of comet Wirtanen. The two detector units for the RTOF (reflection time of flight) mass spectrometer are based on microchannel plate detection of ions and the subsequent timing of these events. Time of flight mass spectroscopy using microchannel plate devices is widespread in commercial applications providing fast pulse performance (< 0.5 ns FWHM) that enables high speed timing accuracy (< 100 ps) in small lightweight packaging. We have used this heritage to provide a compact, lightweight, detector for the RTOF experiment based on standard 6 micrometer pore, 18 mm active area MCPs. The specific design of the RTOF detectors is based on the work of Wurz & Gubler. The performance characteristics are similar to equivalent commercial units with apparent pulse widths of 500 ps (< 250 ps de-convolved), with gain of approximately 106, pulse height distributions of approximately 50% FWHM and background rates of < 0.5 events cm-2 sec-1.
Cottard H.
Kromer Karl E.
Schletti Reto
Siegmund Oswald H.
Wurz Peter
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