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:

▫ 11 coincidence for 98 min (10 cm)

▫ 0 coincidence for 10 min

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