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    User name jpchen

    Log entry time 08:14:38 on June11,2009

    Entry number 280586

    keyword=owl shift summary

    owl shift summary.

    Shift workers: J. P. Chen(SL), K. Pan (TO), E. Jensen (3rd).

    Shift started with LHR continue data taking for (e,e'd) and RHS
    changing to lower momentum (0.7 GeV) for PVDIS and then take
    test run data.

    Events
    --------

    0:05 stopped both L/R runs. Continue L run.
    Started change R HRS from 1.865 GeV to 0.7 GeV.

    01:40 Start Run #3467. The R HRS p0 went below 0.7 GeV, which is 0.623 GeV now. We changed the prescales. The former one is : PS1=1, PS2=1, PS3 = 16777215, PS4=16777215, PS5=65535, PS6=65535, PS7=65535, PS8=100.
    The current setting is PS1=1, PS2=max(16777215), PS3=1,PS4=36, PS5=87, PS6=10, PS7=65535, PS8=65535. Note that the T3 is zero.

    Note: We changed the PS several times during the test run to get the best trigger rates we need. See the "run data" files to see the detail.

    01:45 We stopped Run #22335 and Run #3467 which we just started 2 minutes ago, because we found that these two runs were not taken simultaneously.

    01:50 Start a new Compton run 17306. The previous 17305 "Run End" failing.

    01:50 Start a new Happex run 31510. The previous 31509 "Run End" failing.

    01:52 We start both Run #3468 and Run #22336 simultaneously.

    02:27 Hall A line ioc proble, beam down.

    02:46 Iochla reboot, and beam back.

    03:09 start a new Happex Run 31511.

    03:30 Found the problem of Happex running coda, we reboot it. Details see Hallalog 280545.

    03:50 Start a new Happex Run 31512, and it is taking data now.

    04:06 NMR measurement 61.6%

    07:04 start a new Happex run 31513.

    07:19 start new compton run 17308. Former run 17307 "run ended" failed, details see Halog 280578.




    Run:
    ------
    All L-HRS are production runs.
    All R-HRS are test runs for PVDIS.

    #3467 230K/ #22335 882K Ended in order to synchronize with R-HRS.
    #3468 2.1M/ #22336 1.8M Ended due to MCC IOC problem. The range of the R-HRS p0 is between 0.623 and 0.75

    #3469 / #22337 junk test
    #3470 4M/ #22338 3.3M R-HRS p0 is stable at 0.7Gev.
    #3471 4M/ #22339 3.3M
    #3472 4M/ #22340 3.3M
    #3473 4M/ #22341 3.3M
    #3474 4M/ #22342 3.3M
    #3475 4M/ #22343 3.4M
    #3476 4M/ #22344 3.4M
    #3477 4M/ #22345 3.4M

    NMR sweeps
    ------------
    04:06 NMR 61.6%

    Happex and Compton runs had some problems. See "Events" part for details.