Subject: EHT Trip brought the FEGun down today at 11:4AM for unknown reason
From: James Conway <>
Date: Thu, 19 Jul 2012 14:37:57 -0700


An unidentified cause, possibly a voltage or strong RF spike or
inductive ripple through the house
mains, has resulted in a Extra High Tension trip in the FE-Gun Power
supply.  After a
short rest period to check out sub-systems on the system we restarted
the FE-Gun and
after two hours have returned to near normal emission values albeit
with elevated vacumm
levels  in the system chamber.

All Users are requested to be vigilent and careful in their operation
of the tool and
to report any anomalys encountered.
The only other unusual event is that the Z coder counts errored on one
move earlier
in the morning. Homing the stage to recalibrate did not resolve any
significant delta
in WD or Z calibrations.

RAITH Field service has been informed and consulted with.