Operator: akdogan
Smooth run.
Took ABS-D2 data.
Injection current 225mA - lifetime 29-30min - beam polarization 64.9 +- 0.9%
Other than 1-minute HV restart, no interruption at all.
The latest preliminary Pzz result:
L:0.529 +- 0.031 R:0.448 +- 0.021
for April-9 data.
The only problem:
At the beginning of the shift noticed that there is no flasher event.
Had access to D-tunnel to investigate. Back-traced the signal up to
the raw analog signal that comes from the hall. There is no signal
to start with. Tried to turn on-off-on the flasher via epics remote control.
Did not helped. Learned from Karen that it, in fact, exceeded its expected
lifetime by a factor of 10. Probably it is dead. Decided to wait until
monday to replace the flasher (assuming there is a spare). It should
not effect the data taking and/or data qulity for this relatively
short period of time.
Also noticed (twice) that increase in ligit by about 50% which decays in
time, and then disappears in about 5 seconds. Its effect is clearly visible
by BQMs and beam lifetime. Genya says "it is nothing important."
This archive was generated by hypermail 2.1.2 : Mon Feb 24 2014 - 14:07:32 EST