Had a number of problems initially with the beam (linac and dipoles)
then elog db entries. Took data runs 1123, 1124 (low injection
current) and then "good" data runs 1127, 1129, 1130 (all on d2 ABS)
Then at 22.00 noticed that ligit went below 1xE-7 (was 1.3 during
hydrogren running). At the same time the compression tube went to 1.5E-8
(from 2.5e-8). Checked ABS pressures, pumps, gas bottles, ABs valves.
After coming back from the hall it became clear that also the dissociator
tube had been going up (difficult to see, since changes such as 0.5 torr
are indeed already significant) while ligit was already at 9E-8.
With genya concluded nozzle was clogged. Also wild oscillations (sine
wave like) in the nozzle heater output were visible. Shut off ABS, turn
off coldhead. Plan is also to regenerate the negs tomorrow.
Plan to continue unpol D2 at 0.05 SCCM for the night
during few hours with beam BQM was < 120 max and generally good.
Very few Wch trips. Crate R1 (tofs) tripped (note different than a
channel trip) which required a local reboot.
Worked unsuccesfully on statically compiled version of lrn. Wang found
bug in his FF
-- ________________________________________________________________________________ Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124 research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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