Subject: JEM-X Monday Meeting 2007-02-06

NB: brought for historic reasons
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Participants: NL, SB, JC, CAO, NJW.

JEM-X status (SB): No change. Increased particle background at
end of orbits.
Next Crab calibration (NL, SB): We have asked for 5 ks with
greyfilter exercises.

VC changes in revolution 262 (for checking of gas contamination)
changes also the drifttime of the electron cloud. A low VC
leads to increased drifttime and hence increased probability
for double triggers. The deadtime that follows a hardware
trigger is 5.3 microseconds according to electronic specifications.
No selfconsistent explanation for dead time when grey filter
is active has been found yet.

We are also considering turning off one or more of the anode
segments and change the VC for the study of the dead time
and double triggers.

/NJW