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    User name S. Beck

    Log entry time 08:19:26 on May21,2008

    Entry number 239050

    keyword=5/21/08 owl shift summary

    5/21/08 owl shift summary:

    00:15 - Beam started. ~4 uA

    Starting data taking in Kin. point #2, delta=+2%

    Run 1395: Production data on 6cm LH2 tgt. 4uA for 12min, then 3.7uA. 42% DT, T5=4.1KHz.

    Run 1396...: problems!! 100% DT but rates are as before and the same current of the beam. We rebooted the ROCs and statrted CODA few times. Didn't help.
    With shared effort of Xiaohui and Kalyan that came over to the counting house the problem was solved by performing an immediate reboot of ROC5 (see a separate note in the halog).
    Runs 1396-1399: Junk runs

    2:40 - CODA is working.

    Run 1400: Production data on 6cm LH2 tgt. 3.7uA, 41%DT, T5=4KHz.
    Run 1401: Production data on 6cm LH2 tgt. 3.8uA, 43% DT, T5~4.3KHz.
    Run 1402: Production data on 6cm LH2 tgt. 3.7uA, 42% DT, T5~4.2KHz.
    Run 1403: Production data on 6cm LH2 tgt. 3.8uA, 43% DT, T5~4.3KHz.
    Run 1404: Production data on 6cm LH2 tgt. 3.9uA, 43% DT, T5~4.3KHz.

    6:15 - spot size was too large. MCC changed beam positions on BPMA, such that the values would get closer to the reference values. The spot size reduced but not by much. It is now (XxY); BPMA:1.3x1.8, BPMB: 1.2x2, on target: 1.5x2.7 .

    Is that size adequate for the experiment? Does it add BG from the Al of the target?

    Run 1405: Production data on 6cm LH2 tgt. 4.7uA, 44% DT, T5~4.5KHz. Run 1406: Production data on 6cm LH2 tgt. 3.7uA, 41% DT, T5~4KHz.
    Run 1407: Production data on 6cm LH2 tgt. Many trips of the beam.
    Run 1408: Stopped after 8 min due to problems in the beam. MCC people want to change one of the RF cavities.