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    User name R. Michaels

    Log entry time 05:12:43 on October23,2009

    Entry number 296223

    keyword=low-I cavity test, part I

    5 uA no raster, no target.
    First step is to see if Cavity BPMs make any sense.
    Plan to run down to 10 or 50 nA.

    R-HRS run 4702

    EPICS data:
    4ax -0.26
    4ay 1.24
    4bx -1.31
    4by 2.10

    Cavity positions move, see fig 1.

    Next we'll establish that Lumis can measure current ...
    Ask MCC to move 4bx to 0.2

    Run 4703

    4ax -0.15
    4ay 1.24
    4bx +0.25
    4by 2.04

    Run 4704. Move in Y

    4ax -0.13
    4ay 0.69
    4bx 0.21
    4by 0.06





    FIGURE 1