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    User name jpchen

    Log entry time 01:07:13 on November 9,2007

    Entry number 213099

    keyword=beam x scan with empty target--> x is offset by 1 mm

    Beam x position scan with empty target.
    y=0 and y_raster size=2.5 mm. x_raster size=2 mm.

    BPMA BPMB rad44_p1 T1 T3
    0 0 2x10-1 10 12
    1 1 2.5x10-1 10 12
    1 2 3x10-1 11 13
    1.75 2.85 1x10+0 15 17 (significant increase)
    -1 -1 2x10-1 10 12
    -2 -2 2x10-1 10 12
    -2.5 -3 2x10-1 11 13
    -2.7 -4 3x10-1 11 15
    -3 -5 1x10+0 13 19 (significant increase)

    Conclusion: target is offset by about 1mm in x.
    Will ask for beam to be (-1,0) for both BPMA and BPMB.