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    User name A. Deur

    Log entry time 13:30:22 on December 5,1999

    Entry number 30614

    keyword=eP energy measurement

    6:30 Start first eP energy measurement run (run eP 2747). Condition. OTR in, fast feedback on, eP tune, 3.7 uA (cannot go higher, trip an ion chamber), no raster.
    7: 30 end of the first run. Online result is 0.8434614 +/- 0.000354 (stat) GeV. Measurement is very clean.
    7:30 asked for OTR out.
    7:50 start second eP run (run eP 2748). current 4.1 uA
    9:00 end second measurement. A little less clean (beam moved two times, Fast Feeback went of for 5 min). Online result : 0.8433744 +/- 0.000341 (stat) GeV.

    the following are systematic studies in no optimal condition (beam position off center) and lower statistic. Therefore the only number to consider for now are the two above measurements.



    *****************************************************************
    9:00 Begin systematic studies for eP
    9:00 Start run (run eP 2749) with beam x position offset on eP target : x=-0. 525 mm / y=0.069 mm (bpm IPM1H01, absolute). I=4.1 uA
    9:32 Stop run 2749. Online result :0.842506 +/- 0.000470
    9:32 Start run 2850 x=-0. 998 mm / y=0.088 mm I=4.1 uA.
    9: 44 stop run 2750: Online: 0.841761 +/-0.000366 (stat) GeV. Low stat.
    9: 50 Start run 2751, x=-1.515 mm / y=0.094 mm I=4.1 uA.
    10:12 Stop run 2751. Online:0.843529 +/- .00055453 (stat) GeV
    10:12, start run 2752. x=+0.513 mm / y=-0.025 mm. I=4.15 uA
    10:29 Stop run 2752. Online:0.843011+/-0.000350 (stat) GeV.
    10:30 Start run 2752, x=0.986 mm, y=-0.054 mm I=4.15 uA.
    beam down twice. Stop run at 10:45. Beam down for tuning.--> junk run
    10:52 Start run 2754 . x=0.937 mm/ y=-0.036 mm. Harp Scan done during this run (accidfentally).
    11.12: End run. Online: 0.843769 +/-0.000767 (stat) GeV.
    11:13: start run 2755. x=1.500 mm/ y=-0.070 mm I=4.08 uA
    11:32: stop run 2755. Online:0.842532 +/- 0.000283 (stat) GeV
    11:34 Start run 2756 x=0.015 mm/ y=-0.715 mmI=4.07 uA.
    11.53 End run 2756. Online: 0.843222 +/- 0.000581 (stat) GeV
    Beam stop 15 mm for MCC check and reboot an IOC.
    12:20 Start run 2757. x=-0.032mm, y=-1.502mm I=4.328 uA. Beam down for a few minutes.
    12:40 end run. Online: 0.843041 +/- 0.000423 (stat) GeV
    12:43 Start run 2758. x=0.003, y=1.472. I=4.28 uA
    12:59 Stop run 2758. Online: 0.842437 +/- 0.000545 (stat) GEV.
    12:59 start run 2759. x=0.038 mm/ y=0.687 mm
    13.23 end run 2759. online: 0.842460 +/-0.000883 (stat) GeV.

    ***End of systematic study****************************

    All the measurements look very good. The beam quality was very fine.
    Offline results coming soon