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Proceedings Paper

6-um pore microchannel plate detectors for the ROSETTA-RTOF experiment
Author(s): Oswald H. W. Siegmund; Karl E. Kromer; Peter Wurz; R. Schletti; H. Cottard
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Paper Abstract

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.

Paper Details

Date Published: 13 December 2000
PDF: 8 pages
Proc. SPIE 4140, X-Ray and Gamma-Ray Instrumentation for Astronomy XI, (13 December 2000); doi: 10.1117/12.409115
Show Author Affiliations
Oswald H. W. Siegmund, Siegmund Scientific (United States)
Karl E. Kromer, Siegmund Scientific (United States)
Peter Wurz, Univ. of Bern (Switzerland)
R. Schletti, Univ. of Bern (Switzerland)
H. Cottard, APCO Technologies SA (Switzerland)


Published in SPIE Proceedings Vol. 4140:
X-Ray and Gamma-Ray Instrumentation for Astronomy XI
Kathryn A. Flanagan; Oswald H. W. Siegmund, Editor(s)

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