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Comparison between simulations and calibrations of a high resolution electrostatic analyzer

Rev. Sci. Instrum. 72, 3662 (2001); doi:10.1063/1.1392337

Issue Date: September 2001

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J. H. Vilppola and P. J. Tanskanen
Department of Physical Sciences, University of Oulu, P.O. Box 3000, 90401 Oulu, Finland

B. L. Barraclough
Los Alamos National Laboratory, Los Alamos, New Mexico 87545

D. J. McComas
Southwest Research Institute, San Antonio, Texas 78228
The ion beam spectrometer (IBS) is one of the three spectrometers in the Cassini plasma spectrometer instrument aboard the Cassini/Huygens spacecraft. The IBS is a very high energy resolution hemispherical electrostatic analyzer. The design values of the IBS are analyzer gap 2.5 mm, and middle radius 100 mm. Because of the high energy resolution required, special care had to be used in the design and manufacturing of the instrument. A simulation was developed in order to aid the designing process. Here we show that the best fit to the laboratory calibration of the IBS flight model is obtained using the simulation model, where the inner hemisphere is misaligned by about 20 µm, where a maximum asymmetry of 75 µm is included in the inner hemisphere, and where the analyzer gap is increased from the design value by about 0.1 mm. We show here that geometric factors postulated in the theoretical model resulted in a better agreement between calibrations and simulations than the geometric factors calculated from calibration data alone. We find a value of (2.5±0.1)×10–4 cm2 sr for the geometric factor of the flight model. Finally, we also show that the energy and angle responses of the IBS are somewhat lower than the values calculated directly from the calibration data: (2.0±0.1)% is the value of the full width at half maximum (FWHM) of the energy distribution, and (3.1±0.1)° is the value of the FWHM of the azimuth angle distribution. ©2001 American Institute of Physics.
History: Received 3 November 2000; accepted 13 June 2001
Permalink: http://link.aip.org/link/?RSINAK/72/3662/1
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KEYWORDS and PACS

Keywords
PACS
  • 95.55.Pe
    Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations Astronomical and space-research instrumentation Lunar, planetary, and deep-space probes
  • 07.87.+v
    Instruments, apparatus, and components common to several branches of physics and astronomy Spaceborne and space research instruments, apparatus, and components (satellites, space vehicles, etc.)
  • 06.20.Fn
    Metrology, measurements, and laboratory procedures Metrology Units and standards
  • 07.81.+a
    Instruments, apparatus, and components common to several branches of physics and astronomy Electron and ion spectrometers
  • YEAR: 2001

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
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REFERENCES (19)
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