Main INDEX
Monthly INDEX
PREV
NEXT
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