Subject: JEM-X Monday Meeting 2006-05-17

Present: NL, JC, CBJ, SB, NJW.

JEM-X status (SB): Nominal condition, no further loss of anodes.
We are in eclipse season implying that the initial gain recovery
takes 5-6 hours after exit of radiation belts (in contrast to the
usual 2 hours when outside of eclipse season).

Next high voltage reduction (NL, SB): Extrapolating the gain
development indicates that 15 revolutions (1.5 months) from now
the HV should be stepped down to stay within the usual range of
the gain.

Sco X-1 processing (NL): The observer should address Stephane
Paltani to avoid rejecting good e.g. Sco X-1 data. It is decided
that we (the JEM-X IT) will provide a new IC file (JMXi-GOOD-LIM)
for ISDC with limits set so high that they will never be active in
practice. It is then up to the observer to verify that there is not
too much noise in the data.

JMX2 status (SB): DPE is still running and we can get HK from it.

OSA6 preparation (NJW, NL): j_src_properties has now data reading
and source reading more or less in place.
We must have a look-up table for electronic efficiency (function of
linear PHA). The curtain function must also be mapped (function of
RAWX) for the upper cutoff. It is suggested to put this in as an
IMOD table. Each event should have an efficiency factor assigned.
Perhaps it should be split into a quantum efficiency and electronic
efficiency. We also need the dead fraction (or live fraction).

It will be useful to have an option where such an event list
can be written to a FITS file together with the auxiliary
information.
CBJ pointed out that such information would be misleading for
events that have particles as origin. So when calculating the
background for a given source one must take great care.

On-Request HK (SB): To ensure that all are handled a correction of
the DataBase is required. This is not straightforward and perhaps we
should rely on the Instrument Station. There is no official record
of how the software parameters have been defined. Ground Segment
Configuration Control Board has the final responsibility to solve
this matter. To be discussed.
Nicolas Morisset has made a tool for the processing of TEST format
data but it is not official yet. One version of the TEST format is
for test of the traffic on the high speed line.

Event position correction (SB): Now we have discrete values for DETX
and DETY.  (Simple look-up in CORX-MOD and CORY-MOD). It would
probably have been better to make a once-for-all randomizing (but
j_ima_iros does not use these values). Perhaps we can still do this
because no OSA exectuables make use of these numbers (j_ima_iros
uses RAWX and RAWY).

/NJW


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Niels J. Westergaard
Danish National Space Center
Juliane Maries Vej 30, DK 2100 Copenhagen O
Phone: +45 35325705; FAX:  +45 35362475