TFAS (a tophat for all species): design and computer optimization of a new electrostatic analyzer

TFAS (tophat for all species) is discussed. It is a 360 degrees field-of-view electrostatic analyzer that can process particles of either charge simultaneously. The TFAS analyzer resembles two tophat analyzers placed hat to hat, but with the tophat plates removed and the tophat region shared in common by both analyzers. In the tophat region, deflection is by parallel plates, one with potential +V and the other with potential -V. A collimator allows particles to enter this parallel plate region and the particles are then deflected into the spherical deflection region of the analyzer. The TFAS has characteristics comparable to the spherical tophat analyzer. A mathematical analysis is presented showing the optimal dimensions selection for the TFAS analyzer, given a particular tophat angle. Raytracing simulations have been performed. Design curves showing various analyzer characteristics as a function of tophat angle are presented. The design curves are compared to similar curves already in the literature for the spherical tophat analyzer. Differences between the TFAS analyzer and the spherical tophat analyzer are summarized. >

[1]  A. Cros,et al.  On‐board data analysis techniques for space plasma particle instruments , 1989 .

[2]  P. A. Jensen,et al.  Design, construction, and laboratory calibration of the Angle Resolving Energy Analyzer (AREA): a 'top-hat' instrument for auroral research , 1988 .

[3]  M. J. Sablik,et al.  Computer simulation of a 360° field‐of‐view ‘‘top‐hat’’ electrostatic analyzer , 1988 .

[4]  P. Kintner,et al.  Preferential O(+) heating in the topside ionosphere , 1986 .

[5]  T. Mukai,et al.  Plasma observation by Suisei of solar-wind interaction with comet Halley , 1986 .

[6]  H. Rosenbauer,et al.  Ion flow at comet Halley , 1986 .

[7]  J. Sauvaud,et al.  Comet Halley–solar wind interaction from electron measurements aboard Giotto , 1986 .

[8]  J. Winningham,et al.  Finite difference computer simulation of two diverging electrostatic analyzers: The soft particle spectrometer and the spectrographic particle imager , 1985 .

[9]  D. Curtis,et al.  The Plasma Instrument for AMPTE IRM , 1985, IEEE Transactions on Geoscience and Remote Sensing.

[10]  G. Paschmann,et al.  An instrument for rapidly measuring plasma distribution functions with high resolution , 1982 .

[11]  R. Hoffman,et al.  High-Altitude Plasma Instrument for Dynamics Explorer-A , 1981 .

[12]  R. A. Hoffman,et al.  Dynamics Explorer spacecraft and ground operations systems. , 1981 .

[13]  W. Feldman,et al.  Development of a fast ion mass spectrometer for space research , 1981 .

[14]  J. Mihalov,et al.  The Pioneer Venus Orbiter Plasma Analyzer Experiment , 1980, IEEE Transactions on Geoscience and Remote Sensing.

[15]  W. Feldman,et al.  Effects of a long entrance aperture upon the azimuthal response of spherical section electrostatic analyzers. , 1978, The Review of scientific instruments.

[16]  V. Formisano,et al.  The EGD Positive Ion Experiment on the ISEE-B Satellite , 1978, IEEE Transactions on Geoscience Electronics.

[17]  K. Ackerson,et al.  Quadrispherical LEPEDEAS for ISEE's-1 and -2 Plasma Measurements , 1978, IEEE Transactions on Geoscience Electronics.

[18]  Herbert D. Peckham.  Computers, BASIC, and physics , 1971 .

[19]  V. Vasyliūnas.  Deep space plasma measurements , 1971 .

[20]  J. Winningham,et al.  The Soft Particle Spectrometer in the ISIS‐I Satellite , 1970 .

[21]  F. R. Paolini,et al.  Charged Particle Transmission Through Spherical Plate Electrostatic Analyzers , 1967 .

[22]  Edward M. Purcell,et al.  The Focusing of Charged Particles by a Spherical Condenser , 1938 .