PDS_VERSION_ID = PDS3

LABEL_REVISION_NOTE  = "2010-11-21, SONC, initial release "
RECORD_TYPE                       = STREAM


OBJECT     = INSTRUMENT
  INSTRUMENT_HOST_ID = RL
  INSTRUMENT_ID      ="COSAC"

  OBJECT     = INSTRUMENT_INFORMATION
    INSTRUMENT_NAME ="COMETARY SAMPLING AND COMPOSITION EXPERIMENT"
    INSTRUMENT_TYPE = "MASS SPECTROMETER"
         /* RLC: was {GAS CHROMATOGRAPH, MASS SPECTROMETER} */
    INSTRUMENT_DESC = "

      Instrument Overview
      ===================
      The Cometary Sampling and Composition Experiment (COSAC) is part
      of the Rosetta instrument payload.  It is one of the evolved gas
      analysers of the Lander space-craft Philae. It provides data on
      the volatile fraction and its nature of the nucleus of comet
      67P/Churyumov-Gerasimenko.


      Scientific Objectives
      =====================
      The goal of COSAC is the identification of volatile molecular
      species in the cometary nucleus.


      Calibration
      ===========
      The calibration of the instrument is an ongoing process and the
      results are incorporated in the EGSE software.


      Operational Considerations
      ==========================


      Detectors
      =========
      COSAC comprises two instruments: a gas-chromatograph (GC) with
      eight different columns each equipped with a thermal
      conductivity detector and a time-of-flight mass-spectrometer
      (MS) with a multi-sphere-plate as detector. More details are
      found in Goesmann et.al, 2005


      Electronics
      ===========
      Details on the electronics of the instrument are described in
      Goesmann, et.al, 2005.

      Location
      ========
      COSAC is mounted on the large Pi-plate in the warm compartment
      of Philae.  Samples are delivered by the Sample Drilling and
      Distribution unit (SD2) to ovens located on the balcony of
      Philae.

      Operational Modes
      =================
      COSAC can be operated in basically three different modes: GC
      mode; only the GC is used, MS mode; only the MS is used, or
      coupled mode where the GC exhaust is fed into the MS.  All three
      modes may be run with samples from different sources like
      atmosphere, oven, enrichment capsule, or calibration gas.

      Subsystems
      ==========
      The sub-systems are described in Goesmann et al, 2005.


      Measured Parameters
      ===================
      The COSAC GC measures the retention times of molecular species
      in separation columns, the COSAC MS measures the time-of-flight
      of ionised fragments of molecular species.
    "
  END_OBJECT = INSTRUMENT_INFORMATION


  OBJECT     = INSTRUMENT_REFERENCE_INFO
    REFERENCE_KEY_ID ="GOESMANNETAL2007"
  END_OBJECT = INSTRUMENT_REFERENCE_INFO

END_OBJECT = INSTRUMENT

END