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Instruments > Solar/Space Observing Instruments > Particle Detectors > TIMAS

Preferred term

TIMAS  

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)

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https://gcmd.earthdata.nasa.gov/kms/concept/d29c6ed9-a4f2-42f8-8e8d-3c8a7e6cef4a

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