05/13/2011 timing test

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Set up like that:

The voltages, thresholds and widths are:

	PMT voltage, V	threshold, mV	discr. width, ns
PS1	-1000	-80	50
PS1	-1000	-80	50
n's	-1500	-200	10

Let's do the timing test. The distances are between PS1+PS2 and n's PMT. The time is time difference between PS1(PS2) and n's detector signals

As the distance becomes 10 cm and less the coincidence rate becomes very low. I have:

▫ 10 cm: PS1+PS2+n 11 coinc/98 min, [math](0.11\pm0.03)[/math] coinc/min

▫ 5 cm: PS1+PS2+n 103 coinc/890 min, [math](0.11\pm0.01)[/math] coins/min

▫ 5 cm: PS1 118182 coinc/890 min, [math](2.213\pm0.006)[/math] coins/min

▫ 5 cm: PS2 138573 coinc/890 min, [math](2.595\pm0.007)[/math] coins/min

Below is the plot of measured time as function of distances:

▫ plot for first 10 events (measurements on May 13, 2001)

▫ plot for last 20 events (measurements on May 16, 2001)

▫ combined plot for total 30 events