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    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.


    FIGURE 1

    FIGURE 2