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    User name G.M. Urciuoli

    Log entry time 16:05:21 on July26,2003

    Entry number 107074

    keyword=7/28/03 day shift report



    7/28/03

    day shift


    Shift crew

    SL: G.M. Urciuoli
    TO: E. Keister
    3rd: R. Subedi

    8:25 run 2823 performed to check the raster size. It is o.k.

    8:30 Harp scan performed:

    Scanner 5

    Absolute Beam h position -678
    Absolute Beam v position -65
    Horizontal sigma 146 Vertical sigma 80.

    Scanner 6
    Absolute Beam h position -524 um
    Absolute Beam v position 217 um
    Horizontal sigma 227 Vertical sigma 75.5

    Beam 2 uA

    Time Run N. Target momentum Raster Ps1 Ps2 N. of Events
    9:00 2824 JUNK
    9:00 2825 multifoils 3.065 ON 5 5 2.1 M

    Beam 2.3 uA

    9:48 2826 multifoils 2.976 ON 5 5 2.2 M

    10:24 NMR measurement

    10:43 2827 multifoils 3.160 ON 5 5 2.2 M

    11:00 Controlled access to install the collimator in

    11:27 Hall A in "Beam Permit" status

    Time Run N. Target momentum raster ps1 ps2 N. of events
    11:45 2827 multifoils 3.16 ON 2 2 JUNK
    11:45 2829 multifoils 3.16 ON 2 2 2 M

    right arm run 2830 is JUNK

    Start of Kinematics 6.10
    Right arm: momentum 3.160, angle: 12.5
    Left arm: momentum 3.17, angle: 18

    Beam 10 uA

    Target raster Beam lambda/2 Target Lambda/2
    ref empty cell ON OUT OUT

    right arm run: left arm run
    Time Run number N. of Events Time: Run number N. of Events
    12:14 2831 1.6 M 12:14 22830 1.4 M

    Beam 2.3 uA

    Target raster Beam lambda/2 Target lambda/2
    N2 ref. cell ON OUT OUT
    (140 psig)

    right arm run left arm run
    Time Run Number N. of Events Time Run Number N. of Events
    13:05 2832 2 M 13:05 22831 1.2 M

    It seem that the beam spot size is bad again and, as a consequence, the Compton polarimeter does not perform correctly.
    The target was shift to single Carbon at 13:45 to allow beam tuning.

    one run with single foil carbon target was performed to increase statistics:

    Time: 13:49 Right Arm Run Number 2833 Left arm Run Number 22833

    14:12 beam tuning is over (even if the beam size is not completely satisfactory).

    14:30 Harp scan these are the result:

    scanner 5

    absolute beam h position -619 um
    absolute beam v position -190 um
    Horizontal sigma 158 um
    Vertical sigma 98.73

    scanner 6

    absolute beam h position -541 um
    absolute beam v position 44 um
    Horizontal sigma 237 um
    Vertical sigma 74.50

    right arm run 2834 is JUNK

    14:48 a checking run with single foil carbon target is performed
    Right arm Run number 2835, Left arm Run number 22834
    3M events collected in right arm, 0.2 M in right arm.

    15:15: back to Kinematics 6.10

    Beam 2.3 uA

    Target raster Beam lambda/2 Target lamba/2
    3He 0 deg ON OUT OUT

    right arm runs
    Time Run Number PS1 PS2 N. of Events
    15:15 2836 1 1 2 M
    15:33 2837 1 1 2.2 M
    15:51 2838 1 1

    left arm runs
    Time Run Number N. of Events
    15:15 22835 0.155 M
    15:33 22836 0.190 M
    15:51 22837

    15:45 bleedthrough measurement performed:

    bleedthrough 1.84%
    Slit Position 33
    Attenuator 275