COSAC

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Status and on-comet science Fred Goesmann
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MS
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MS
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GC
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(1) Which major open issues need to be performed
with your Philae experiment during cruise and
when?

• feeding a sample from oven to MS via GC,
  bypassing GC columns
• consequence of non-operational side terminal of
  tapping station.
• PC8

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(2) Is the instrument fully commissioned and
ready for the on-comet science during the 1st 5
days after landing and is it expected to work
according to specifications?

• (YES)

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(3) If your answer to question (2) is not a clear
"yes", please provide explanations on to what is
missing, when it should be done and whether full
performance is likely to be recovered?

• fine tuning of measurement parameters might
  improve results.
• Does not change
• Command structure
• Timing
• Amount of data

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(4) Is the instrument fully commissioned and
ready for the on-comet science of the long-term
mission and is it expected to work according to
specifications?

• NO

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(5) If your answer to question (4) is not a clear
"yes", please provide explanations on to what is
missing, when it should be done and whether full
performance is likely to be recovered?

• MS-oven option not yet operational
• PC8
• whether the performance will be fully recovered
  remains to be tested with the flight spare, where
  direct comparison of both modes can be done.

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(6) What are the science goals for the long-term
mission and which specific modes of the
experiment are to be used, what are the relevant
requirements and constraints?

• chirality measurement
• GC-MS
• three samples, three columns
• noble gases
• MS
• long term MS sniffing measurement
• derivatisation measurement
• GC-MS
• two measurements

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(7) What are the actual values for the power,
energy, data volume and rate as well as any other
parameter constraining the instrument modes?

• p
• GC-MS 20W peak
• MS lt15W peak
• E
• 5 Wh / GC-MS (30 min total)
• 1 Wh / MS (10 min total)
• data
• 1.2 MB per full GC-MS measurement in 30 min
• 0.1 MB for long MS sniffing measurement in 30 min

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team