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    User name bosted

    Log entry time 23:55:59 on January13,2002

    Entry number 80319

    keyword=Calorimeter Treshold Scan

    We did a series of runs changing the calorimeter threshold.
    These runs are using the 15 cm norad target and elastic kinematics,
    with the bend magnet off. The electron peak should be around 1.3 GeV,
    so we should start cutting into the peak with something like 150 mV,
    which is what was observed. It looks like there is a 1/k steeply rising
    spectrum of photons or electrons at low energy, followed by the
    large elastic peak, as can be seen from the singles gammas (T1) and
    coincidence (T5) trigger rates as a function of threshold:
    This is kinematics 2A at 5 muA.
    Run Threshold T5 T1
    1495 -26 180 Hz 380K
    1496 -40 144 210K
    1497 -55 110 100K
    1498 -70 96 40K
    1499 -85 95 14K
    1500 -100 92 6.1K
    1501 -115 80 2.9K
    1503 -130 79 1.3K
    1510 -145 63 600
    1511 -160 47 230
    1512 -175 29 110