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- The Cosmic Ray Nuclear Composition (CRNC) on IMP-8 experiment used two
telescopes to measure the composition and energy spectra of solar (and
galactic) particles above about 0.5 MeV/nucleon. The main telescope consisted
of five collinear elements (three solid state, one CsI, and one sapphire
Cerenkov) surrounded by a plastic anticoincidence shield. The telescope had a
60-deg, full-angle acceptance cone with its axis approximately normal to the
spacecraft spin axis, permitting eight-sectored information on particle arrival
direction. Four elements of the main telescope were pulse-height analyzed, and
low- and high-gain modes could be selected by command to permit resolution of
the elements H through Ni or of electrons and the isotopes of H and He and
light nuclei. A selection-priority scheme was included to permit sampling of
less abundant particle species under normal and solar-flare conditions. The
low-energy telescope was essentially a two-element shielded solid-state
detector with a 70-deg full-angle acceptance cone. The first element was
pulse-height analyzed, and data were recorded by sectors.
The Cosmic Ray Nuclear Composition (CRNC) telescope was designed and built at
The University of Chicago, Enrico Fermi Institute (EFI), Laboratory for
Astrophysics & Space Research (LASR), Simpson Cosmic Physics Group and is now
being operated out of the The University of New Hampshire Institute for the
Study of Earth, Oceans and Space (EOS). The PI is Dr. Clifford Lopate.
For additional information, see:
http://ulysses.sr.unh.edu/WWW/Simpson/imp8.html
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