User name lkaufman
Log entry time 21:09:58 on July23,2005
Entry number 149233
keyword=Current/fan speed scans
Current/fan speed scans.
Each run was taken with beam off data at the beginning or end of the run for
pedestals. At each beam current, the HV was adjusted on the detectors and
Blumis in order to get about 40000 channels from the ADC. At each beam current
(4, 10, 30 uA), a run with the fan speed at 40 Hz and 60 Hz was taken. We used
a 7x7 raster.
19:59 - Run 3788: fan speed = 60 Hz, 4 uA, end of run has no beam
20:07 - Run 3789: fan speed = 40.5 Hz, 4 uA, beginning of run has no beam
Lowered HV in preparation for higher beam current.
20:16 - Ask MCC for 10 uA.
20:18 - Set Det and blumi voltages (Run 3790)
20:24 - Run 3791: fan speed = 40.5 Hz, 10 uA, end of run has no beam
20:30 - Change fan spped to 60 Hz.
20:31 - Run 3792: fan speed = 60 Hz, 10 uA, beginning of run has no beam
20:39 - Lower HV on dets and blumis to productions values.
20:41 - Ask MCC for 30 uA
20:43 - Run 3793 - set HV for 30 uA
20:51 - Run 3794: fan speed = 60 Hz, 30 uA, end of run has no beam
20:57 - Change fan speed to 40 Hz.
20:58 - Run 3795: fan speed = 40.5 Hz, 30 uA, beginning of run has no beam.
End of test.