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    User name jpchen

    Log entry time 21:47:10 on May12,2009

    Entry number 272834

    keyword=center beam on reference cell and pol. He3 cell

    We finished checking reference cell position (edges).
    With 6x6 raster, it hits a little bit of edge at x=-0.5 mm (y=2 mm).
    Moved to x=0 mm, it gets worse. moved to x=-1.0, not hitting anymore.
    So, x=-1.0 would be a good center for reference cell.
    Checked on pol. He3 cell, at x=-1.0mm, with 6x6 ratser, it hits edge
    a little bit. Moved to x=-0.5mm, it does not hit.
    So we decided to leave it at the original position of x=-0.5, y=2mm.