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    User name V. Sulkosky/C. Dutta

    Log entry time 10:59:58 on October 4,2008

    Entry number 243490

    keyword=S2m Timing Resolutions

    Below are the resolutions obtained for S2m. The PMT resolution was
    obtained from a cosmic run 1525 with T3 = "or" of S2m paddles. The
    intrinsic resolution was obtained from a pulser run 1532. In this
    case the T3 trigger was the 1024 Hz clock, which was plugged into an
    EDTM Amp board. The outputs from this board then plug into the S2m
    splitter boxes.

    For the PMT resolutions, we accounted for the path length difference
    between cosmics traveling through the height (5.5") of the bar
    versus electrons through the thickness (2") of the bar.

    The table provides the resolutions in ps. Overall the resolutions
    look good; however, there is quite a bit of spread in the numbers
    (106 to 164). The values for the top half of the detector deviate
    by more than 1 sigma from the mean. On the other hand, the spread
    in the lower half of the detector appears reasonable.

    The intrinsic resolutions are all better than 100 ps. Typically the
    values are better than 70 ps. There are four anomalous values.
    Paddle # 2 and 3 are exceptionally good and Paddle # 12 and 13 are
    about 15-20 ps worse than the others. After the detector stack is
    back in the hut, I will see if I can isolate the cause of the
    spread in values.

    I would attach the figures showing the resolution plots from the cosmic data, but the Halog "Grab Picture" utility isn't working.



    align="center">Sigma_PMT(ps)




































































    Paddle(PMTs) #Sigma_delta(ps)Intrinsic
    Resolution from Pulser run (ps)
    0----67.9(+/-)0.2
    1228 (+/-)15.6154.9(+/-)10.570.3(+/-)0.2
    2199(+/-)15134.7(+/-)10.352.7(+/-)0.2
    3242.5(+/-)21164(+/-)14.845.8(+/-)0.2
    4157.5(+/-)11.2106.6(+/-)7.662.4(+/-)0.2
    5172.9(+/-)11.5117(+/-)7.7571.5(+/-)1.0
    6236.7(+/-)21.5160(+/-)1471.3(+/-)0.4
    7187.9(+/-)17.5127.2(+/-)11.868.1(+/-)0.2
    8162.6(+/-)13.4110.1(+/-)9.159.7(+/-)0.2
    9190(+/-)15128.6(+/-)1061.1(+/-)0.2
    10211.6(+/-)19.5143.2(+/-)13.264.3(+/-)0.2
    11215.8(+/-)20146.1(+/-)13.661.1(+/-)0.2
    12190.4(+/-)13.2128.8(+/-)8.985(+/-)1.6
    13209(+/-)22.5141.9(+/-)15.292.1(+/-)1.0
    14210(+/-)12.5142.4(+/-)8.454.6(+/-)0.2
    15-----57.8(+/-)0.2