User name R. Michaels
Log entry time 03:34:18 on October27,2001
Entry number 75137
keyword=results of target current scanTarget Current Scan results.
Again using scalers, corrected for charge, we can get a crude
check of the target current scan, see fig 1.
The error bars are 1% just to set the scale. I don't really know the error bar.
The L-arm and R-arm "cross section" agree with each other in the trend
of decreasing about 3% as beam current increases from 20 to 100 microamp.
The coinc trigger "cross section" increases. Presumably it has two components:
real and random. The random rate increases like I**2 where I = beam current.
But no attempt was made to correct the coincidence trigger for randoms.
Below are the data in tabular form.
Notation
I-nom = nominal beam current, I-bar = average beam current
Sigma-1, Sigma-3, Sigma-5 = Cross section (ARB units) for R, L, and coinc.
Note, typically I-bar is less than I-nom, since beam trips off. Well that's all
you can do with scalers. Offline analysis can correct for beam trips.
Run......I-nom.....I-bar.........Sigma-1...........Sigma-3.........Sigma-5
1230.......20.........17.1..........1.017...............1.015...............0.8966
1231.......20.........19.4..........1.020...............1.016...............0.8966
1232.......40.........30.8..........1.014...............1.009...............0.9533
1233.......40.........35.0..........1.010...............1.007...............0.9560
1234.......60.........28.4..........1.008...............1.003...............1.007
1235.......60.........14.6..........1.005...............1.001...............1.004
1240.......77.........77.3..........0.9803...........0.9878...............1.037
1242.......77.........65.8..........0.9803...........0.9869................1.040
1243......100........99.2..........0.9796...........0.9853................1.099
1244......100........84.5...........0.9860..........0.9898................1.110
FIGURE 1
