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    User name paschke

    Log entry time 11:35:10 on June14,2010

    Entry number 326487

    This entry is a followup to: 326453

    keyword=run 4517: bpm12 gain failure

    Run 4517: bpm12 wires low signal, probably fast-feedback failure
    
    Please remain watchful of the bpm 12 wire signals, which should remain in the 
    neighborhood of 80k-120k.  Too high, too low are potentially bad.  
    
    In this case, the bpm gain was fixed at too low a value.  The sudden appearance 
    of the strange pair distributions likely  indicate a gain-fail of the FFB 
    system, so significant 60 Hz beam motion.  Furthermore, the bpm signal became 
    quite noisy.  It is unclear whether this data from the end of this run is 
    recoverable. 
    
    


    FIGURE 1