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    User name Kai Pan

    Log entry time 08:29:41 on September 4,2009

    Entry number 287930

    keyword=owl shift summary


    SL: Kai Pan
    TO: Kalyan Allada
    3rd: Hoyoung Kang

    00:00 controlled access. Rupesh, Mark and Alex asked for quick access into the hall.

    1:30 still contronlled access. Mark and Rupesh are still in the hall working for the MPS inversion peoblem.

    3:20 MPS inversion puzzle solved.

    3:30 All guys left the hall, and called for beam permit.

    3:45 status changed to beam permit. Ask for 10uA beam delivery for Luis's work, but MCC said they still need to take some time to achieve that.

    3:55 Stable CW 10uA beam sent to the Hall. Luis finished his work. Result is good.

    4:05 Asked MCC to do Harp Scan. Turn off the raster.

    4:30 MCC finished Harp Scan. Result attached as ELOG. Looks the same as the previous good one, so go to the spot++

    http://opweb.acc.jlab.org/CSUEApps/elog02/elog_item.php?elog_id=1485109

    4:40 ask MCC to deliver 5uA 11*8.5 (MCC) beam for spot++

    5:10 5uA, 11*8.5 (MCC), Optics target for spot++ check. Took two runs for this raster size set up. Result not good, showing that it hits something in Y-position. Decreased to 7.7*8.0 (MCC) to do spot++.

    5:20 spot++ for 7.7*8.0 is better, but not optimal

    5:40 spot++ #4446, changed back to 11*8.5 raster size again, result still bad, decide to run in 7.7*8 at this moment

    5:50 turn off VDC, target move to LH2, counting mode, 5uA first and then 10uA, to measure the rate of Happex scaler counting.

    6:30 Bob called in and explained the spot++ problem. Problem fixed. Raster size 11*8.5 (MCC) looks OK. See separate halog.

    7:00 Finish Holey target run and runs that for the measurement of Happex scaler counting.

    7:30 start production run #11991, though it is only 80uA

    7:50 MCC called that they cannot reach 100uA, only 90uA is available for now.

    8:20 Kent called in. We stopped run #11992, changed HV for right arm Happex (slot14/channel9) from -1700 to -1200, then start new run #11993. Note that beam is not very stable, and the maxium beam current MCC told us that they can reach is 90uA for now.

    Run Info:

    #4443~#4446 spot++ run (details see separate Halog)
    #4447,#24639 Holey Target run, 0.5uA
    #4448,#24640 Holey Target run, 5uA

    24640/4448, holey target, 7.7x8, 5uA
    24641/4449, 25cm LH2, 7.7x8, 5uA
    24642/4450, 25cm LH2, 7.7x8, 10uA
    4452 spot++, 25cm LH2, 11x8.5, 0.5uA
    24644/4453, 25cm LH2, 11x8.5, 10uA
    24645/4454, 25cm LH2, 11x8.5, 5uA
    24646/4455, Carbon, 11x8.5, 5uA

    11991, production, 25cm LH2, 11x8.5, 80uA
    11992, production, 90uA

    Nightmare!