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    User name D. Lhuillier

    Log entry time 00:47:07 on October15,2005

    Entry number 156896

    keyword=Shift Summary

    The sweeper magnet turns out to be very efficient with the hydrogen target. We were able to increase the beam current up to 60uA. Septum temperature is difficult to read because of frequent RF trips. It's probably in the 7.5 -7.6 range at 60uA. Hence we have some margin to go higher but we'll keep running at this current for tonight.
    Septum heating slope is about 0.02 degree/uA.

    Target boiling is <= 170ppm at 60uA and fan speed=60Hz

    Increasing the fan speed to 70 Hz reduces it down to 155ppm (see Bob's entry)

    ###############################################################

    Run 5609 30uA, production style. Dithering disabled. Compton interaction region optimization.



    16:39 - started run 5609
    16:50 - beam gone for 10-15 minutes to fix Hall B problem.

    17:10 - MCC called to say that there would be no beam for at least 20 min more.

    17:39 - 30 uA of beam back in Hall A

    17:55 - Compton interaction point tuning done

    18:05 - MCC has viewers in, beam back in 10-15 minutes.

    18:13 - 30 uA of beam back in Hall A

    19:15 - request new raster setting 9x12

    19:40 - lots of beam trips in the last 1/2 hour.

    20:00 - request new raster setting 6x12

    20:20 - scanner run

    21:30 - go to 40 muA
    21:45 - jt valve open so that we can go higher in beam current

    22:10 - go to 50muA

    23:00 - go to 60muA after having raised the trip limit on the ion chamber in the left dump

    23:30 increase fan speed to 65Hz

    23:45 increase fan speed to 70Hz

    Summary of runs
    ------------------
    5607 - boiling check
    5608 - global check
    5609 - global check, dithering off
    5610 - pedestal run
    5611 - global check, dithering off for Compton interaction point setup
    5612 - production style, dithering on again.
    5613 - raster 9x12 3k good pairs
    5614 - raster 9x12 10k good pairs
    5615 - raster 6x12 10k good pairs
    5616-5621 scanner runs
    5622 - 40muA HV tune
    5623 - 40muA
    5624 - 50muA HV tune
    5625 - 50muA
    5626 - 53muA HV tune
    5627 - 60muA HV tune
    5628 - 60muA - 60Hz fan speed
    5629 - 60muA - 65Hz fan speed
    5630 - 60muA - 70Hz fan speed