@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/5f5e4f2c-61b7-4694-8680-3fc5799f6171>
  skos:prefLabel "Particle Detectors"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/d29c6ed9-a4f2-42f8-8e8d-3c8a7e6cef4a> .

<https://gcmd.earthdata.nasa.gov/kms/concept/d29c6ed9-a4f2-42f8-8e8d-3c8a7e6cef4a>
  ns0:resource [ ] ;
  ns0:altLabel [ ] ;
  skos:definition """The Toroidal Imaging Mass-Angle Spectrograph (TIMAS) instrument measures the
full three-dimensional velocity distribution functions of all major
magnetospheric ion species with one-half spin period time resolution. The TIMAS
is a first order double focusing (angle and energy), imaging spectrograph that
simultaneously measures all mass per charge components from 1 AMU/e to greater
than 32 AMU/e over a nearly 360 degrees by 10 degree instantaneous
field-of-view in 20 milliseconds. Mass per charge is dispersed radially on an
anular microchannel plate detector and the azimuthal position on the detector
is a map of the instantaneous 360 degrees field of view. With the rotation of
the spacecraft, the TIMAS sweeps out a 4pi solid angle image in a half spin
period. The energy per charge range from l5eV/e to 32 keV/e is covered in 28
non-contiguous steps spaced approximately logarithmically with adjacent steps
separated by about 30%. In order to handle the large volume of data within the
telemetry limitations the distributions are compressed to varying degrees in
angle and energy, log-count compressed and then further compressed by a
lossless technique. This data processing task is supported by two SA3300
microprocessors. The voltages (up to + 5 kV) for the tandem toroidal
electrostatic analyzers are supplied from common high voltage supplies using
optically controlled series-shunt regulators.

For more information, see:
http://lasp.colorado.edu/timas/TIMAS_description.html
and
http://pwg.gsfc.nasa.gov/polar/polar_inst.shtml


Group: Instrument_Details
   Entry_ID: TIMAS
   Group: Instrument_Identification
      Instrument_Category: Solar/Space Observing Instruments
      Instrument_Class: Particle Detectors
      Short_Name: TIMAS
      Long_Name: Toroidal Imaging Mass-Angle Spectrograph
   End_Group
   Group: Associated_Platforms
      Short_Name: POLAR
   End_Group
   Online_Resource: http://lasp.colorado.edu/timas/TIMAS_description.html
   Sample_Image: http://lasp.colorado.edu/timas/Full_size_b.gif
   Group: Instrument_Logistics
      Instrument_Start_Date: 1996-02-24
      Instrument_Owner: Lockheed Martin Missiles & Space Company
      Instrument_Owner: Southwest Research Institute
      Instrument_Owner: Mullard Space Science Laboratory, University College, UK
      Instrument_Owner: University of Berne, Switzerland
   End_Group
End_Group"""@en ;
  skos:prefLabel "TIMAS"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/5f5e4f2c-61b7-4694-8680-3fc5799f6171> ;
  a skos:Concept .