User name R. Michaels
Log entry time 00:45:14 on November19,2005
Entry number 160614
keyword=Q2 measurementsSwitch to spectrometer DAQ for Q2 measurements.
Did the checklist.
Rates at 0.5 uA:
T1 = 259 kHz
T2 = 200 kHz
T3 = 238 kHz
T4 = 204 kHz
T5 = T6 = 0
T7 = 335 kHz
T8 = 334 kHz
Run 3099 with I = 0.5 uA. Collect 1 M events
Reduced the beam current to 0.2 uA. Of course this means we
lose position info in EPICS.
Run 3100 with I = 0.2 uA. Collect 1 M events
Fig 1 & 2 are the usual detector and Qsq plots for 200K events
of run 3100. Yes, the database is way off but at least the plots
did not change.
After run 3100 finished we ask for 0.5 uA briefly.
Observe that beam positions did not become too bad.
This means the positions were probably ok during 0.2 uA.
Beam Info at Sat Nov 19 00:41:42 EST 2005
Average beam current: hac_bcm_average 0.539069
X position at 4A: IPM1H04A.XPOS 1.60929
Y position at 4A: IPM1H04A.YPOS 0.00617576
X position at 4B: IPM1H04B.XPOS -1.32461
Y position at 4B: IPM1H04B.YPOS 0.37543
After this, we switch back to HAPPEX DAQ. Did the checklist.
Note, starting at about 0:15 we received warnings that the
Compton photon rate is too high (this happens above 10 kHz).
Glancing at it I saw 13 to 19 kHz.
FIGURE 1
FIGURE 2
