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    User name Jin Huang

    Log entry time 08:29:35 on April 24, 2009

    Entry number 267800

    keyword=Ref Cell Center Scan

    A reference cell center search is performed with 2uA beam. Ref cell is
    filled with 0 psig H2 to show a clearer rate change if beam hits on cell
    wall, as well as carry away the beam heat from the wall.

    center BPM on ref cell are
    BPMA = (-1.0 2.1)
    BPMA = (-0.5 2.1)


    -----------------

    Scan history

    Raster BPMA BPMB T1 T3 Spot++ run
    4x4 -1.3 1.5 -0.8 1.5 1.3K 1.8K 1313 No hit
    6x6 -1.3 1.5 -0.8 1.5 1.3K 1.8K 1314 No hit
    14x14 -1.3 1.5 -0.8 1.5 19K 12K ----
    10x10 -1.3 1.5 -0.8 1.5 2.1K 2.7K 1316 Hit on one side
    10x10 -0.8 1.5 -0.3 1.5 2.1K 3.0K 1317 Hit on one side
    10x10 -0.8 1.0 -0.3 1.0 3.0K 4.3K 1318 Hit on one side, badly
    10x10 -0.8 2.0 -0.3 2.0 1.8K 2.5K 1319 Hit on all four corners
    10x10 -1.0 2.0 -0.5 2.0 1.9K 2.6K 1320 Hit on all four corners
    10x10 -1.0 2.2 -0.5 2.2 1.3K 2.7K 1321 Hit on all four corners




    A copy of this log entry has been emailed to: brads