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    User name sarty

    Log entry time 00:02:32 on May20,2008

    Entry number 238895

    keyword=Swing Shift Summary

    Swing Shift Summary

    Shift Workers: A. Sarty, G. Huber, Y. Wang

    1. 16:00 - 17:19
    Finish Kin2, delta= -2% running: (Runs 1333-1335)
    ------------------------------------------------------------------
    Details:
    16:08 Run 1333 completed (Kin 2, delta=-2%, 3.5uA on 6cm LH2
    Run 1334: continue (Kin 2, delta=-2%, 3.5 uA on 6cm LH2)
    ....start @ 16:08; end @ 16:47
    End of Kin 2, delta=-2% production running.
    Put Al Dummy target in.
    Run 1335: Al Dummy @ Kin 2, delta=-2%, 10uA (start @ 16:58, end @ 17:19)
    ------------------------------------------------------------------

    2. 17:25 - 17:55
    BigBite Wire Chamber Tests (runs 1336-1355)

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

    3. Change to Kin2, delta=0% (HRS momentum set to 0.5648 GeV/c)
    17:55 - 20:05
    Production running: Runs 1356-1358 (12.35M events)
    -----------------------------------------------------------------
    Details:
    Set current to ~2uA (trying 3.5uA gave too high T5 rate)
    Run 1356: Kin2, delta=0%, 2uA on 6cm LH2 (end @ 16:40 w/ 3.5M events)

    Turn *on* all BB Shower Blocks for checking (bottom rows had been off).
    All back on @ 18:50. Reset prescalers.

    Run 1357: Kin2, delta=0%, 2uA (start @ 18:57, end @ 19:35): 5 M events

    Increased current to 2.8 uA (to get deadtime up to ~35%, DAQ @ 2.4kHz)

    Run 1358: Kin2, delta=0%, 2.8uA (start @ 19:40, end@20:05): 3.85M events

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

    4. 20:05 - 20:44 (Runs 1359-1361) - 1.5 M good triggers
    Tests to determine which BB blocks to keep-on/turn-off
    -------------------------------------------------------------------
    Details:
    Run 1359: short run with many BB shower blocks off
    Run 1360: another run, now also with BB pre-shower off; start with 2.7 uA; ramp up to 6 uA during run; then 10 uA.
    Looked great! High data (2.7 kHz), 37% deadtime @ 10 uA (with only 2 BB shower counters on, giving practically *all* elastic events).

    Run 1361: try running with 4 extra blocks on (the 2 from before, plus 4 surrounding)...need to now run @ lower currents to keep deadtime appropriate. (GOOD RUN: 1.5 M events)

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

    5. 20:44 - 23:57
    Continue production running @ Kin2, delta=0%): Runs 1362-1366
    (25 M events ... grand total for setting @ end of Run 1366 = 43 M)

    -------------------------------------------------------------------
    Details:
    Run 1362: same as before, with 5.5 uA (end @ 21:15) 5 M events
    Run 1363: continuing @ 5.5 uA (end @ 21:45) 5 M events
    Run 1364: end @ 22:17, 5 M events
    Run 1365: end @ 22:47, 5 M events
    Run 1366: end @ 23:33, 5 M events
    Run 1367: end @ 23:57, 4 M events
    -------------------------------------------------------------------