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    User name peter

    Log entry time 08:04:00 on August14,2003

    Entry number 110627

    keyword=Owl shift summary

    Shift Leader: Peter Monaghan
    Target Operator: Jaideep Singh
    3rd Person: Andrew Puckett

    00:00 Shift begins with checking the beam dimensions with the OTR
    and several Harp scans.

    00:35 Harp scans were giving inconsistent results compared to the
    OTR. The OTR had an acceptable beam size, with the harp run
    #2402 giving spot sigma of 237(horizontal) x 97(vertical).

    00:35 - 01:07 Setting the raster size; found 5 x 5 (MCC) gave an
    approximate size of 3.5x3.5 mm on the spot++ screen.

    0:53 - 01:05 Coda problems on the right arm led to the ROC1 crate
    needing to be reset.

    01:35 MCC having problems delivering beam to hall A as the beam
    dump ion chambers are alarming and causing the beam to trip.

    02:19 MCC have informed us that due to hall A running one pass beam
    there are higher amounts of radiation in the beamline and
    also causing the dump ion chambers to alarm. MCC believe
    they can reliably deliver 5uA beam to the hall this evening
    without causing the ion chambers to trip. They would require
    RadCon approval to run at 10uA due to the higher radiation
    levels. We have decided to take the 5uA in the hope of being
    able to complete some of the septum optics data taking.


    02:47 - 02:59 Changing kinematics for optics runs to HRS-R momentum
    of 1.142 GeV/c.

    04:45 - 05:00 Changing kinematics to HRS-R momentum of 1.108 GeV/c.

    05:15 - 05.25 MCC making an F-Opt measurement so beam will be
    restored after it is finished.

    05:33 Request a controlled access to the hall in order to
    remove the sieve slit and install the collimator. Start to
    change kinematics back to HRS-R momentum = 1.176 GeV/c back
    power cycling the quadrupoles on the right arm.

    06:22 The collimator has now been installed inside the scattering
    chamber.

    06:30 Beam restored.

    07:15 Changing kinematics to set HRS-R momentum to 1.142 GeV/c.

    07:33 Reducing current to 3 uA in order to reduce the rates
    observed.

    07:52 MCC perform a bleedthrough measurement and find that it is
    0.97% with hall C at 40uA.

    ----------------------------------------------------------

    Septum Optics Runs - 5uA beam

    HRS-R/Septum Momentum = 1.176 GeV/c Raster off

    01:16 - 01:26 23493/3493 Empty Target 2.8M events

    02:35 - 02:46 23494/3494 Carbon multifoil 1.6M events

    HRS-R/Septum Momentum = 1.142 GeV/c
    Septum current = 143.5A

    03:07 - 03:12 23496/3496 C foils - Raster OFF 1.1M events

    03:25 - 03:30 23497/3497 C foils - Raster ON 1M events

    03:37 - 03:47 23498/3498 Empty target - Raster ON 2.1M events

    03:55 - 04:06 23499/3499 Empty Reference Cell - Raster ON 2M events

    04:12 - 04:22 23500/3500 N2 filled cell - Raster ON 2.3M events

    04:34 - 04:44 23501/3501 Empty Target - Raster OFF 2.1M events


    HRS-R/Septum Momentum = 1.108 GeV/c
    Septum current = 139.5A

    05:01 - 05.11 23502/3502 Empty target - Raster OFF 2.1M events

    05:28 - 05.32 23503/3503 C foils - Raster OFF 1M events

    05:33 - 06:22 Remove the sieve slit and install the collimator.


    HRS-R/Septum Momentum = 1.176 GeV/c
    Septum Current = 147.75A

    06:43 - 06:53 23504/3504 C foils - Raster 0FF 2M events

    07:02 - 07:13 23505/3505 Empty Target - Raster OFF 2.5M events.


    07:33 Set BEAM current to 3uA


    HRS-R/Septum Momentum = 1.142 GeV/c
    Septum Current = 143.5A

    07:35 - 07:45 23506/3506 Empty target - Raster OFF 2.7M events

    07:54 - 08:02 23508/3508 C foils - Raster OFF 1.2M events