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    User name sawatzky

    Log entry time 12:04:41 on October 27, 2005

    Entry number 158158

    This entry is a followup to: 158101

    Followups:

    keyword=Hall B laser bleed through for runs 5917--5924 (and Compton runs 12524--12527)

    During the Mott measurement we noticed that the Hall B laser had lost lock at around 19:00 yesterday night. For reasons outlined in ELOG 129658 this was not noticed until this morning. Hall B laser had been shut off at around 03:00 for them to troubleshoot a solenoid trip. Details and stripcharts are logged in the linked ELOG entry.

    That means we will have had bleed-through from their laser for the roughly 8 hour period from 19:00--03:00. This may have contributed to the poor beam quality we experienced up until 21:00 (although it is not clear to me why it would have improved after that point...).

    Bleed through current and polarity are not known. Measurements will be run this afternoon.

    HAPPEx runs 5917--5924 and Compton runs 12524--12527 will be affected.

    A copy of this log entry has been emailed to: paschke@jlab.org, snyder@jlab.org, rom@jlab.org