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    User name Eric Voutier

    Log entry time 00:08:00 on March23,2007

    Entry number 196995

    keyword=Shift summary


    Crew on Shift : Ramesh Subedi, Eric Voutier
    --------------

    16:00 Starting shift with no beam and empty target in place

    17:55 Moving the right spectrometer to kin08 at 77.30 degres

    18:17 Beam back to the hall with 3.8 10^-5 energy spread at 40 uA
    MCC is making an HARP scan to check the beam spot size
    ELOG # 1365620 sigma_y = 0.12 +/- 0.04 mm

    18:29 Move lead target number 3 in

    19:15 Notice very weird beam tune on BPM A; Mark suggests to go back
    on carbon and investigate what is going on with this

    19:22 Carbon in place, asking 40 uA...
    The spot information is shifted on BPM A but looks similar to
    previous values in epics. Spot_L and Spot_R gives similar
    information but just inverse (detector map problem a priori).
    Bob was informed but he does not have any idea on what is going
    on...

    We finally decided to believe epics and move back on carbon

    20:07 Going back to lead target and data production

    20:34 Injector drops to restricted access

    21:26 MCC ready for beam delivery, we are on escorted access to
    fix the BCM cable.

    21:35 Had an access to troubleshoot possible cable problem on BPM
    A readout in the left arm; now ready to take beam back

    Target ---> meanwhile, had ESR alarms, reboot the target computer
    and reduce JT valve

    21:51 Check the Spot_L once again; the hall access did not solve the
    problem on BPM A readout.

    22:39 Beam is back


    Run History
    -----------

    - Kin 08 right arm is 77.301 degres at 0.989 GeV/c

    1830 ... 10 uA Those runs might be used but the beam tune is
    1831 ... 20 uA weird.
    1832 ... 10 uA .... runs are ok, it was a readout problem

    1833 ... 40 uA Carbon target / beam optic test

    1834 ... 10 uA Lead 0.007667 C 0.007667
    1835 ... 20 uA Lead 0.008949 C 0.016616
    1836 ... 10 uA Lead
    20 uA Lead 0.019340 C 0.035956
    1837 ... 40 uA Lead 0.017910 C 0.053866
    early stop because of beam off, but data ok
    1838 ... 40 uA Lead 0.046400 C 0.100266
    1839 ... 40 uA Lead 0.045600 C 0.145866
    1840 ... 40 uA Lead 0.045580 C 0.191446
    1841 ... 40 uA Lead 0.046490 C 0.237936