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    User name A. Puckett

    Log entry time 01:39:53 on April25,2007

    Entry number 199938

    keyword=4He Production statistics so far...

    At the current kinematics, with Pe = 3.755 GeV and P_4He = .686 GeV, here is a summary of all production runs so far, since the start at these settings on Thursday night/Friday morning with run 2681:

    Run #, Tgt, Charge (C), (uA), N(T5)
    2681, 4He, .03877, 76.3, 3856
    2682, 4He, .118, 78.14, 11599
    2683, 4He, .1181, 70.54, 12040
    2684, 4He, .1182, 66.92, 12431
    2685, 4He, .1172, 77.8, 11701
    2686, 4He, .1176, 74.3, 11865
    2687, 4He, .1175, 72.9, 12078
    2688, 4He, .1178, 70.5, 12062
    2689, 4He, .1175, 75.9, 11859
    2690, 4He, .1179, 74.3, 11867
    2691, Dummy, .1261, 32.4, 14510
    2692, 4He, .1201, 72.7, 11883
    2693, 4He, .1191, 76.6, 11574
    2694, 4He, .1193, 71.6, 11827
    2695, 4He, .1197, 66.0, 12289
    2696, 4He, .0876, 67.8, 9049
    2717, 4He, .0741, 57.4, 8618
    2718, 4He, .0735, 76.9, 7581
    2719, 4He, .0728, 82.0, 7401
    2720, 4He, .0823, 59.1, 9704
    2722, 4He, .0830, 69.7, 8866
    2723, 4He, .0824, 81.9, 8390
    2724, 4He, .0824, 64.4, 9139
    2725, 4He, .0826, 71.9, 8787
    2726, 4He, .0823, 71.8, 8776
    2727, 4He, .0822, 68.2, 8887
    2728, 4He, .0824, 69.0, 8960
    2729, 4He, .0821, 77.5, 8546
    2730, 4He, .0825, 61.8, 9217
    2731, 4He, .0817, 79.2, 8456
    2732, 4He, .0821, 78.1, 8596
    2733, 4He, .0818, 80.6, 8327
    2734, 4He, .0819, 70.2, 8819
    2735, Dummy, .1059, 66.5, 6007
    2736, Dummy, .1616, 79.2, 7741
    2737, Dummy, .00949, 40.4, 878
    2738, Dummy, .0193, 33.4, 2148
    2739, Dummy, .0310, 35.6, 3241
    2740, 4He, .0831, 34.9, 12697
    2741, 4He, .1316, 67.5, 14416
    2742, 4He, .1304, 74.9, 13760
    2743, 4He, .1301, 68.2, 14368
    2744, 4He, .0139, 18.2, 3462
    2745, 4He, .1312, 69.6, 14245
    2746, 4He, .1304, 75.0, 13951
    2747, 4He, .1298, 74.6, 13862
    2748, 4He, .1291, 82.9, 13298
    2749, 4He, .1297, 72.9, 13990
    2750, 4He, .0167, 48.4, 2153
    2757, 4He, .00334, 4.65, 2692
    2758, 4He, .0282, 27.7, 5293
    2759, 4He, .1305, 80.7, 13439
    2760, 4He, .1294, 74.9, 13706
    2761, 4He, .1293, 70.7, 14085
    2762, 4He, .0809, 74.0, 8639
    2763, 4He, .0810, 74.7, 8619
    2764, 4He, .0810, 85.2, 8225
    2765, 4He, .0811, 82.8, 8278

    Total Charge, 4He runs = 4.94 C
    Total Charge, Dummy runs = .45 C

    Avg Current, 4He runs = 69.4 uA
    Avg Current, Dummy runs = 41.7 uA

    Based on these numbers, in order to bring the net charge on the dummy target up to 15% of the charge on the 4He, we will run about .3 C worth of charge on the dummy target, which at 40 uA should take about
    2 hours, which we will do sometime this shift.