The Giotto implanted ion spectrometer (IIS) - Physics and technique of detection

Details The Giotto implanted ion spectrometer (IIS) - Physics and technique of detection The Giotto implanted ion spectrometer (IIS) - Physics and technique of detection

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jphe...20..778w&link_type=abstract

Journal of Physics E - Scientific Instruments (ISSN 0022-3735), vol. 20, pt. 2, June 1987, p. 778-785.

Physics

Plasma Physics

23

Giotto Mission, Halley'S Comet, Ion Charge, Mass Spectrometers, Solar Wind, Time Of Flight Spectrometers, Lorentz Force, Plasma Physics, Signal Processing, Solar Radiation, Spacelab Payloads, Ultraviolet Radiation

Scientific paper

The implanted ion spectrometer (IIS) is a dedicated instrument for the analysis of ionized cometary particles and their interaction with the solar wind. The particle identification principle used in IIS is based on ion deflection in an electrostatic analyzer in combination with time-of-flight techniques. The constructed particle identifier function considers the ionic charge as a known quantity, since ionization by solar UV radiation is the dominant process. The instrument uses novel principles to accommodate a low-power/low-weight state-of-the-art spectrometer. A multisensor system with miniature time-of-flight detectors together with the spacecraft spin motion provide a uniform, though not contiguous, angular coverage of the unit sphere. New detector multiplexing techniques permit the operation of IIS with maximum sensitivity without sacrificing time or angular resolution because of duty cycle effects, IIS is an integral but physically separate part of the solar wind ion analyzer JPA in the Giotto payload. The sensor system and the operation of IIS are described. The flight performance is illustrated by observations in the undisturbed solar wind and near the comet.

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