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User name R. Michaels
Log entry time 02:01:30 on March26,2010
Entry number 313735
keyword=establishing beam on target, part 101:30 Starting the plan aimed at getting 50 uA on Pb/diamond.
Unfortunately the raster is too small.
But we can make some progress.
01:35 ... Put in Holey target. 0.5 uA (step 8).
BPMs X,Y
4A: 0.8, 0.3 mm
4B: -0.2, 0.3 mm
upper scints turned on. T5 rates:
L-HRS 1.9 MHz
R-HRS 1.8 MHz
these might be saturated.
See an anti-hole, fig 1. I guess the rates are too high.
Ask for 10 nA. Laser atten=75, slit=15
Rates L-HRS 720 kHz, R-HRS 1.08 MHz Still high
Ask for Atten=65. Slit still 15
L: 350 kHz and R: 600 kHz
During the ramp-down runs 26923 and 6324 were running
and recording scalers.
01:50 ... Reduce slit to 14.5 (atten still 65)
L: 265 kHz
R: 475 kHz
Start runs 26924 and 6325
At these lower rates the picture is clearer, fig 2.
Looks like we are way off center. Hitting a frame.
FIGURE 1
FIGURE 2
