• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name paschke

    Log entry time 08:01:08 on January22,2003

    Entry number 92971

    keyword=Shift Summary



    Started shift with tests of background due to beam halo. Adjusted raster
    size/shape. Performed optics and background measurements for the new momenta
    and got about 4 hours of production on 5.2.4 (HWP out, 0 degrees, 2.975 GeV/c).

    Minor DAQ problems chewed up ~25 minutes of beam.

    ----------------------------------------------------------------------
    20472, 20473 (1472,1473) junk runs to check raster size
    20474, 1474 empty reference cell, small raster (2x1), Hall C pre-buncher OFF to
    check effects of halo/tail.
    20475, 1475 BeO/C target, raster off to check for spot size and location.
    20476, 1476 through (20479, 1479) BeO/C, playing with raster size/aspect ratio.
    20480, 1480 Empty reference cell, raster on (4x4 and round!), 12 uA
    20481, 1481 N2 (147psi) reference cell. 12 uA. Beam x position unstable.
    20482, 1482 N2 (147psi) reference cell. 12 uA. Beam x position unstable.
    20483, 1483 N2 (147psi) reference cell. 12 uA. 146 psi to start, 136 at end.
    20484, 1484 BeO/C optics, raster off, 5 uA.
    (OTR says spot size is 210 rms x, 220 rms y)
    20485, 1485 3He production run, 0 degrees. 10 uA, and beam positions wandered.
    20486, 1486 3He production run. 12 uA. Ended with L-HRS DAQ failure.
    20487, 1487 3He production run. Ended with L-HRS DAQ failure.
    20488, 1488 3He production run. Ended early to reset DAQ.
    20489, 1489 3He production run.
    20490, 1490 3He production run.

    -----------------------------------------------------------------------------------------
    01:32 beam returning in standard configuration. 5uA, raster off to check spot size
    and location.
    01:44 beam position ok, now checking raster size
    02:15 the raster was badly shaped. We adjust the raster aspect ratio and
    the diameter. Now happy with the raster, we are taking 12 uA on the
    empty reference cell.
    02:53 filled reference cell with N2 (147psi) for background measurement.
    02:59 re-started N2 reference run
    03:24 going to BeO/C for optics data. Raster off, 5 uA.
    03:43 polarization measurement
    04:40 L-HRS DAQ hang (ts1).
    06:44 L-HRS DAQ hang (ts1).