Particle Detectors
type: Concept

CPI-G
type: Concept
definition: The objective of the CPI investigation on Geotail is to make comprehensive observations of the three-dimensional velocity distribution functions of electrons and positive ions, with identification of ion species. The instrument contains three sets of quadrispherical analyzers with channel electron multipliers. These three obtain three-dimensional measurements for hot plasma and solar wind electrons, for solar wind ions, and for positive-ion composition measurements. The positive-ion composition measurement includes five miniature imaging mass spectrometers at the exit aperture of the analyzer, and covers masses from 1 to 550 u/Q at 100 eV, and 1 to 55 u/Q at 10 keV. The hot plasma analyzer measures electrons and ions in the range 1-50,000 eV/Q. The solar wind analyzer measures ions from 150 to 7,000 eV/Q. Sequencing of the energy analyzers and mass spectrometers, and other control functions, are provided by two microprocessors. Principal Investigator: Prof. Louis A. Frank Department of Physics and Astonomy The University of Iowa Van Allen Hall, Iowa cty, IA 52242-1479 Phone: 1-319-335-1695 Fax: 1-319-335-1753 e-mail: frank@iowasp.physics.uiowa.edu See: http://pwg.gsfc.nasa.gov/geotail_inst.shtml and http://www-pi.physics.uiowa.edu/www/cpi/ Group: Instrument_Details Entry_ID: CPI-G Group: Instrument_Identification Instrument_Category: Solar/Space Observing Instruments Instrument_Class: Particle Detectors Short_Name: CPI-G Long_Name: Comprehensive Plasma Investigation-Geotail End_Group Group: Associated_Platforms Short_Name: GEOTAIL End_Group Online_Resource: http://www-pi.physics.uiowa.edu/www/cpi/ Online_Resource: http://pwg.gsfc.nasa.gov/geotail_inst.shtml#CPI Sample_Image: http://www-pi.physics.uiowa.edu/cpi/cpi_description/cpi_plate2.gif Group: Instrument_Logistics Data_Rate: 4.608 kbps Instrument_Start_Date: 1992-07-24 Instrument_Owner: University of Iowa End_Group End_Group
in scheme: instruments