User name Saha
Log entry time 12:13:49 on February 6,2002
Entry number 81970
This entry is a followup to: 81876
keyword=BCM Calibration - 0L02/FC2
BCM Calibration - 0L02/FC2
Calibration of the 0L02 vs. Faraday Cup 2 at the injector
z = 0L02/FC2
Step calibration (see figure1)
@~69 uA z = 0.999 +/- 0.008
@~37 uA z = 1.000 +/- 0.005
@~19 uA z = 1.000 +/- 0.009
@~9 uA z = 0.999 +/- 0.006
@~4.5 uA z = 0.996 +/- 0.008
There is a gap in the data after this step (possibly due to a rf trip) and the beam comes back at ~2.5 uA and steps down to ~0.6 uA. This data seems spurious (seems there is a ~0.2uA offset in the FC2 data). Even when there is no beam being registered in the 0L02 and other current monitors there is a ~0.2 uA current being registered in the FC2 monitor. Need to consult the experts on this.
Figure 2 shows the data for about an hour at ~69 uA.
The two montors track with each other. The ratio z = 1.001 +/- 0.006 over this range for over an hour.