PDS_VERSION_ID               = PDS3
RECORD_TYPE                       = STREAM
LABEL_REVISION_NOTE               = "
          2016-06-01 JUNO:    LEBrown  Revision 1;
                                     "

OBJECT                    = INSTRUMENT
  INSTRUMENT_HOST_ID      = "JNO"
  INSTRUMENT_ID           = "JEDI"

  OBJECT                  = INSTRUMENT_INFORMATION
    INSTRUMENT_NAME       = "JUPITER ENERGETIC-PARTICLE DETECTOR INSTRUMENT"
    INSTRUMENT_TYPE       = "ENERGETIC PARTICLE DETECTOR"
    INSTRUMENT_DESC       = "

    Juno will be the first spacecraft to fly over the poles of the planet
    Jupiter at low altitude. Juno science objectives for the polar
    magnetosphere include: Investigate the primary auroral processes
    responsible for particle acceleration, characterize the field-aligned
    currents that transfer angular momentum from Jupiter to its
    magnetosphere, identify and characterize auroral radio and plasma wave
    emissions associated with particle acceleration, and characterize the
    nature and spatial scale of auroral features.

    Juno is ideally suited to determine the auroral distributions of
    charged particles due to its low altitude passes through the polar
    region of the planet. For the auroral science, The Jupiter Energetic
    Particle Detector Instrument (JEDI) will directly measure
    precipitating fluxes including particles that generate the planetary
    aurora and particles that heat and ionize the planetary
    atmosphere. Detailed analysis of the particle spectral and angular
    characteristics will be used to study acceleration mechanisms. JEDI
    has the capacity through its electron measurements to determine the
    magnetic topology of the polar cap region.


    Jedi will measure the energetic plasma.  The JEDI system covers the
    energy range of 25 keV to > 500 keV for electrons, and 10 keV/nucleon
    to ~20 MeV total energy for ions.  JEDI determines the distributions
    of the high-energy magnetospheric ions and electrons, including the
    composition of ions.  It does this by measuring the energy and
    velocity of the particles and then using a look-up table to determine
    the mass and therefore the species of particle. The measured species
    for JEDI include electrons and ions (H, He, O, S).

    Rapid spacecraft motions and slow spacecraft rotation require that
    JEDI simultaneously and continuously resolve both magnetic loss cones
    at every position inside of ~ 3 RJ.  JEDI uses 2 individual
    instruments (JEDI-90 and JEDI-270), each with multiple views that
    continuously sample within a 360 degree plane roughly normal to the
    spacecraft spin axis.  All sky coverage is additionally achieved every
    spin with an additional sensor (JEDI-A180) that views coplanar to the
    spin axis.


    Each JEDI sensor consists of a 60 mm diameter, hockey-puck-like
    cylinder, in which a start foil and stop foil, wrapped around opposite
    curved sides of the cylinder, constitute the time-of-flight chamber.
    An incoming energetic ion will pass through the collimator and a
    passive thin foil designed to keep the cold plasma out of the
    instrument.  Then the ion passes through the start foil generating
    forward-scattered electrons that are then focused towards a
    microchannel plate.  The ion will continue through the chamber to the
    stop foil, generating backscattered electrons, also accumulated on the
    MCP.  The ion will then pass into a solid-state detector, providing
    the third component of the measurement.  Since the time-of-flight
    (TOF) can be computed from the start and stop signals and the chamber
    size is known, the particle speed can be obtained.  The velocity
    coupled with the energy yields the ion species.  For ions that fall
    below the discrimination level of the solid-state detectors, a heavy
    vs. light determination can be made with the TOF and the anode pulse
    height.

    The detectors are arranged so that each detector senses the events
    within a given range of incidence angles.  One of the JEDI sensors
    also contains witness detectors.  Each of the six detector modules is
    composed of four pixels: large and small ion and large and small
    electron.  The electron detectors differ from the ion detectors in
    that they add a layer of aluminum, which excludes low-energy ions.
    Each electron and ion detector is split into a small pixel and a large
    pixel; the large pixel has 20 times the area of the small pixel.  This
    provides 24 detector elements.

"

  END_OBJECT                     = INSTRUMENT_INFORMATION

  OBJECT                         = INSTRUMENT_REFERENCE_INFO
    REFERENCE_KEY_ID             = "MAUKETAL2013"
  END_OBJECT                     = INSTRUMENT_REFERENCE_INFO

END_OBJECT                     = INSTRUMENT
END