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  <Instrument>
    <ResourceID>spase://CNES/Instrument/CDPP-AMDA/STEREO-A/IMPACT/LET</ResourceID>
    <ResourceHeader>
      <ResourceName>LET</ResourceName>
      <AlternateName>Low Energy Telescope</AlternateName>
      <ReleaseDate>2019-05-05T12:34:56Z</ReleaseDate>
      <Description>
      The Low Energy Telescope, LET, is one of four Sensors that make up the Solar Energetic Particle, SEP, 
      Instrument of the IMPACT Investigation for the NASA STEREO Mission. LET is a special Double-Fan Arrangement of 
      14 Solid State Detectors designed to measure the Elemental Composition, Energy Spectra, Angular Distributions, 
      and Arrival Times of H to Ni Ions from ~3 to 30 MeV/n. It will also identify the rare Isotope 3He and trans-Iron 
      Nuclei with 30?Z?83. 
      The SEP Measurements from the two STEREO Spacecraft will be combined with Data from ACE and other 1 AU Spacecraft 
      to provide multipoint Investigations of the Energetic Particles that result from Interplanetary Shocks driven by Coronal 
      Mass Ejections, CMEs, and from Solar Flare Events. The multipoint in situ Observations of SEPs and Solar Wind Plasma 
      will complement STEREO Images of CMEs in order to investigate their Role in Space Weather. 
      LET uses a standard dE/dx versus E Technique, where E stands for Energy, identifying Particles that stop at Depths of 
      ~20 micron to 70 micron and ~70 micron to 2000 micron corresponding to two general Energy Ranges. The large Field of 
      View spans from 20° above to 20° below the Ecliptic Plane, and extends 65° to either Side of the forward and backward 
      Parker Spiral Field Directions in the Ecliptic Plane. LET's large Geometric Factor also ensures the Detection of even 
      small SEP Events. 
      Each LET Instrument includes a Sensor System made up of an Array of 14 Solid State Detectors composed of 54 Segments 
      that are individually analyzed by custom Pulse Height Analysis System Integrated Circuits, PHASIC. The Signals from four 
      PHASIC Chips in each LET are used by a Minimal Instruction Set Computer, MISC, to provide onboard Particle 
      Identification of a dozen Species in ~12 Energy Intervals at Event Rates of ~1000 Events/s. An additional Control Unit, 
      called SEP Central, gathers Data from the four SEP Sensors, controls the SEP Bias Supply, and manages the Interfaces 
      to the Sensors and the SEP Interface to the IMPACT Data Processing Unit, IDPU. 
      </Description>
      <Acknowledgement>The STEREO IMPACT LET Team</Acknowledgement>
      <Contact>
        <PersonID>spase://SMWG/Person/Janet.G.Luhmann</PersonID>
        <Role>PrincipalInvestigator</Role>
      </Contact>
      <Contact>
        <PersonID>spase://SMWG/Person/Mark.E.Wiedenbeck</PersonID>
        <Role>CoInvestigator</Role>
      </Contact>
      <Contact>
        <PersonID>spase://SMWG/Person/Alan.C.Cummings</PersonID>
        <Role>CoInvestigator</Role>
      </Contact>
      <Contact>
        <PersonID>spase://SMWG/Person/Branislav.Kecman</PersonID>
        <Role>CoInvestigator</Role>
      </Contact>
      <Contact>
        <PersonID>spase://SMWG/Person/Richard.Leske</PersonID>
        <Role>CoInvestigator</Role>
      </Contact>
      <Contact>
        <PersonID>spase://SMWG/Person/Richard.A.Mewaldt</PersonID>
        <Role>CoInvestigator</Role>
      </Contact>
      <Contact>
        <PersonID>spase://SMWG/Person/Edward.C.Stone.Jr</PersonID>
        <Role>CoInvestigator</Role>
      </Contact>
      <InformationURL>
        <Name>STEREO/IMPACT Mission Site</Name>
        <URL>http://sprg.ssl.berkeley.edu/impact/</URL>
      </InformationURL>
    </ResourceHeader>
    <InstrumentType>ParticleDetector</InstrumentType>
    <InvestigationName>In-Situ Measurements of Particles and CME Transients, IMPACT, Low Energy Telescope on STEREO A</InvestigationName>
    <ObservatoryID>spase://CNES/Observatory/CDPP-AMDA/STEREO-A</ObservatoryID>
  </Instrument>
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