spase://CNES/Instrument/CDPP-AMDA/Geotail/CPI

The objective of the Comprehensive Plasma Instrumentation (CPI) investigation 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 of the Ion Composition
(IC) analyzer 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 (HP) analyzer measures electrons and ions
in the range 1-50,000 eV/Q. The Solar Wind (SW) 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.