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    User name K. McCormick

    Log entry time 15:59:01 on July10,2001

    Entry number 65756

    keyword=Target field survey

    A survey of the target field direction was done during the day on 7/9.
    The field direction was measured with the compass with various settings of the
    target holding field and the gradient coils (NOTE: the nominal field angle
    is 52.5 deg):

    Target Gradient Coils Survey
    holding field T (A) L(A) Angle
    ------------------------------------------
    0 deg 0 0 52.46673
    5 -2 52.49800
    6 0 52.48270
    0 -7 52.45839

    180 deg 0 -7 52.06922
    6 0 52.04972 (Repeat 52.06484)
    5 -2 52.04383
    0 0 52.06852

    This field direction is almost 0.5 deg off of nominal, so we tried to adjust it several
    times:
    180 deg 0 0 52.20560
    0 0 52.22662
    0 0 52.19392
    0 0 52.19274
    0 0 52.16796
    0 0 53.01407
    0 0 52.84694
    0 0 52.47173
    Satisfied, we went on to 270 deg:
    270 0 0 52.24911
    5 -2 52.24439
    6 0 52.24017
    0 -7 52.25362
    90 0 -7 52.24640
    6 0 52.24168
    5 -2 52.25493
    0 0 52.24182

    Then we tried to do some repeatability measurements:
    270 0 0 51.93250
    0 0 52.32209 (tapped compass)

    0 0 0 52.19868
    0 0 52.26595 (tapped compass)

    For the exact transverse and longitudinal current, see the target logbook page
    151.