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    User name paschke

    Log entry time 20:15:44 on April19,2004

    Entry number 118608

    keyword=Bad energy spread!


    Energy spread measurement was started about 19:00.

    News from Arne isn't good. The energy spread looked very poor,
    with an RMS width at 1C12 of .5mm (9e-5), but very non-gaussian,
    with a long tail.

    This means that runs 2558, 2559 and 2560 have a large energy width,
    approximately 3 times over spec. (Run 2561-62 also, but those are optics runs.)

    Ops worked to improve this number, but they were hamstrung by
    the energy measurement software tool being unavailable due
    to some computer trouble (disk mount points and such). When the
    tool was finally made to work, the results of all their labor was
    discouraging: width = 6e-5.

    Experts have been called in. In the meantime, we are going back to
    Doug's optics runs.