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    User name D. Parno

    Log entry time 14:57:58 on February 23, 2009

    Entry number 262910


    keyword=Syncroc studies: L1A vs Clock for Run 1688

    Run 1688 was taken during the owl shift on 22 Feb. Fig. 1 shows the ROC synchronizations for the first 50,000 events, including a long gap early in the run. Fig. 2 shows L1A:clockcnt for the first 1,000,000 events.

    Fig. 2 shows a flat line for most of the run, as we would expect. There is one point (at clockcount ~12000) that deviates significantly from this line. It is conceivable that this could show part of the ramp back after a beam trip, but similar plots for previous beam trips show much more gradual ramping -- this doesn't have the right shape.

    This is the last run I'll be examining in this way for now. Thanks to Vince for proposing the plots and Ellie for performing the replays.

    A copy of this log entry has been emailed to: brads, kalyan, flay, posik, moffit

    Figure 1

    Figure 2