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    User name A. Camsonne

    Log entry time 08:59:43 on January 9,2003

    Entry number 91184

    keyword=Owl shift summary

    00:00 Shift begin with no beam ( work on injector )

    00:30 Target polarization measurement show polarization dropped to 20%
    going back from 180 to 0 and pumping back the cell

    1:15 JP Chen advise us to do the He3 Delta asymmetry

    1:20 MCC sends some beam for tuning
    changed at the injector are affecting the beam position, MCC working to bring the same beam position

    1:25 Setting momentum to 0.675 Gev/c to do Delta asynnetry on He3 on both spectrometer

    1:35 MCC ready to send some beam
    we take 5 uA on BeO target
    BPM position is OK

    start of run to check raster with spot++
    raster rdius is ok 4mm, but off in Y ( 1.5 mm )
    calling run coordinator to see if it is OK for the target
    It is ok as long as BPM are close from X=1.0 and Y=0
    We will make a small run at low current, A. Deur will check the position of the beam on the window

    2:20 Spectrometer ready to take data

    2:30 Beam on Helium 3 target 1uA
    Starting run to check beam position on target

    2:45 found out that the laser are not well aligned no transverse measurement can be done because of the target displacement earlier, so going back to elastic
    Started momentum change back to 1.046 and cycling Q2,Q3 on both arms

    2:50 MCC has problem with Hall C beam, take away the beam to fix the problem

    3:15 Only configuration we need ( or can ) do is Half wave plate out at 0 degrees
    After concertation with Hall B and Hall C, we can take it out.

    3:34 EPR measurement : Target polarization is 23 %

    3:40 Beam is back.
    BPMA X:1.023 Y:-0.027
    BPMB
    Start of run

    3:45 Momentum was not set right 1.046 Gev/c instead of 1.051 Gev/c
    Run 20223 and 1223 are junk runs

    4:00 Hall C start the Half/wave plate scan test

    4:04 Spectrometer set to 1.051 Gev/c

    4:07 Hall C start the Half/wave plate scan test
    Taking data anyway

    6:45 Patricia added the EPICS value of the rotating halfwave plate


    7:30 To improve target polarization, we lower the current to 2.5 uA and set prescale factors to 2/2/2/2


    7:35 MCC take the beam away to investigate the source of beam trips

    7:50 Beam is back
    7:54 Beam was really off in Y ( 7 mm ! ) ask to stop the beam and work on the
    beam tuning and moving to BeO target to check the position.
    One target RTD has been damaged.