Subject: JEM-X Monday Meeting 2006-09-04
Date: Mon,  4 Sep 2006 14:33:41 +0200 (MEST)

Participants: CBJ, SB, JC, NL, CAO, AH, NJW.

JEM-X status (SB): No hotspot activity.

Gain variations after switch-on (SB): Gain development right after HV switch-on
can be modelled by an error-function. This function appears in solutions of diffusion
problems and here we are dealing with metal-ions diffusing in the surface of the
micro-strip glass plate.

Crab calibration preparations (NL): The program is being prepared by Eric Kuulkers.
Most of our proposed program will be carried out but there is a limitation to the
TM rate. Will we get 2 or three packets - or even only 1 ? Crab calibration will only
be half a revolution. The passage through radiation with low voltage on our
detector to observe the effect on the gain stabilization process after nominal HV
switch-on will probably happen before rev 483 (NB note a change to earlier planning).
No response yet for the reinstallation of old rejection criteria.

OSA6 (NJW): During the chat last wednesday where Stephane Paltani participated
it was realized that j_src_properties could not be 'well tested and well functioning'
before Sep. 15 - the deadline for a new OSA version before the data analysis.

Comparison of PIF and shadowgrams (NJW): A detailed comparison between PIF maps
and 42 summed shadowgrams where a strong source is found at the same position in
the FOV within 1 arcmin reveals some significant differences between modelling
and data. (Some of the effect is some mismatch between coordinate systems and the
presence of dead anodes).

j_ima_iros (NL): The BPL without the collimator cannot be made although formally
there should be no big problems. The sensitivity in the images depends on the
collimator model used as tested by various degrees of attenuation of Crab
observation data.
It would be very good to include the off-axis normalization as requested by
Roland Walter in the delivery of j_ima_iros for OSA6.

j_cor_gain (CAO): Has been delivered last week. But in NRT pipeline there are
too many difficulties to include it just like that. There is a strange bug that
only appears at ISDC and in some science windows. Reading the gain history table
causes trouble.
Earlier problem with data from an early revolutions where the Xe line fell at a too
low energy has been produced with much too old j_cor_gain version as well as
IMOD instance number.

SDAST meeting date (NL, NJW): Will be found when Peter Kretschmar is back from
holiday around Sept. 16.

Next JEM-X representative at ISDC: SB in end of September (tentative).

/NJW