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  <Version>2.2.6</Version>
  <Instrument>
    <ResourceID>spase://CDPP/Instrument/AMDA/Pioneer11/CPC</ResourceID>
    <ResourceHeader>
      <ResourceName>Charged Particle Composition</ResourceName>
      <ReleaseDate>2009-05-20T21:10:01Z</ReleaseDate>
      <Description>This 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 8-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, 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. Data include the interplanetary region.</Description>
      <Contact>
        <PersonID>spase://SMWG/Person/John.A.Simpson</PersonID>
        <Role>PrincipalInvestigator</Role>
      </Contact>
      <InformationURL>
        <Name>NSSDC's Master Catalog</Name>
        <URL>http://nssdc.gsfc.nasa.gov/database/MasterCatalog?sc=1973-019A&amp;ex=2</URL>
        <Description>Information about the Charged Particle Composition experiment on the Pioneer 11 mission.</Description>
      </InformationURL>
    </ResourceHeader>
    <InstrumentType>EnergeticParticleInstrument</InstrumentType>
    <InvestigationName>Charged Particle Composition on Pioneer 11</InvestigationName>
    <ObservatoryID>spase://CDPP/Observatory/AMDA/Pioneer11</ObservatoryID>
  </Instrument>
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