Day 3:
Today we were able to get our paddles correctly hooked up to
find the coincidence of the paddles. A
coincidence happens when both paddles receive a hit at the same time. We hooked up Paddle A to a fixed voltage and
our Paddle B was hooked to a voltage that we increased by 100 V every two
minutes. Using the Visual Scalar, we
were able to count the number of hits going through Paddle B to Paddle A. To find the rate, we divided our number of
hits by two and got the number of counts per minute.
Day 4:
We started today by doing a second trial of what we
accomplished yesterday. Then using
MatLab, we plotted the average of both trials and were able to find the optimal
level of voltage to use for Paddle B.
This voltage ended up being 1,800 V.
We then repeated the process we began yesterday giving Paddle B a fixed
voltage and Paddle A an increasing voltage.
Dr. Cummings also showed us what the inside of a Photomultiplier tube
(PMT) looks like. The PMT is collecting
the signal on our paddles.
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