Subject: JEMX Internal Meeting 2004-03-29


Participants: ILR, CAO, JC, NL, CBJ, SB, and NJW

1) Instrument status
   JMX1 may have another dead/weak anode #83. Further checks are necessary.
   The JMX1 gain increase is about 1% in 3 weeks (no temperature correction).
   This is much less than for JMX2. Xe peak looks OK.

2) Preparations for laboratory ageing tests.
   FM1 (our lab model) has been put in thermo-controlled box. We ought
   to make reference measurements of the gain. The heating will not start
   until after easter.
   We should measure the time constant for recovery of gain after intense
   local irradiation. Perhaps the irradiation should be done with a 60 keV
   source at some distance covering most of the detector and a local,
   more powerful illumination with a 55Fe source.
   The format of the output files was discussed; we seem to have software
   to read those files ("test format" of .hsl files in diagnostic format).

3) Munich papers: CAO has submitted. JC is very close. NJW and NL need
   (much) more work. SB needs more thinking. CBJ has delivered to Kirsch.
   
4) Danish Physical Society Meeting (May 27). We will present some
   INTEGRAL/JEMX results.
     
5) Energy calibration. A systematic study of Crab calibrations has been
   done. A TN is out, a "repair kit" has been distributed to some users
   by NJW.
   CBJ pointed out that the position resolution depends on the gain so
   Stefan's S/W may therefore be gain dependent. SB remarked that a way
   to check the event-to-source assignment efficiency by comparing
   Crab observations with different off-axis angles i.e. in a dither.
   
6) Midisky distribution. NL has got some feedback showing that it
   actually works at other sites.

7) The ISSW imaging software with fine resolution images has been slowed
   down but the delivery to ISDC should happen mid- or late April (2004).

/NJW

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Niels J. Westergaard
Danish Space Research Institute
Juliane Maries Vej 30, DK 2100 Copenhagen O
Phone: +45 35 32 57 05; FAX:  +45 35 36 24 75