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    User name johna

    Log entry time 16:24:50 on April25,2007

    Entry number 200019


    keyword=Unsual spot++ result

    spot++ results fo run 2796 (attached) looked odd. From looking at position vs. event number, it appears that the beam may have been drifting in y over the first 50k events, yielding an odd pattern in the BPMs (notice that the raster readback looks normal, and the target distribution looks OK). Anyway, we will keep a close eye on the spot++ and BPM readback for future runs to make sure the beam position is stable.

    FIGURE 1

    FIGURE 2