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    User name R. Michaels

    Log entry time 17:14:55 on July17,2006

    Entry number 174349

    keyword=helicity check

    After plugging in T9, I had to tune some cuts in the HaHelicity
    algorithm. Since I know I'll get a lot of questions about helicity,
    here are some results: Fig 1 shows how helicity gets loaded at
    start of run, so the first few seconds have undefined helicity (in
    principle one could back-track and recover these). Fig 2 shows
    the helicity for non-T9 events after the predictor algorithm is
    loaded (ca 1000 events here). Of course for T9 they are all
    helicity==0. For non-T9 there is ~1.5% with helicity==0 due to
    the blanking-off period of 500 usec every 30 msec.

    The plots are for R-arm but L-arm are similar.

    FIGURE 1

    FIGURE 2