Beam Test Jul 20 2012

We started up the accelerator where we left from yesterday.

Detector tests

Beam Left Detector

Electron gun trigger and detector diode signal put into and logic. We want to put the annihilation target in and out, see how it affects the rate.

Mode  Annihilation Target     Slit width   D1(A) D2(A)   Counts  /    Time(s)     Rate(Hz)
e+    in                      1.00 cm      4.2   4.2     445     /    199.9         2.23
e+    out                     1.00 cm      4.2   4.2     545     /    199.9         2.72
e+    in                      1.00 cm      4.2   4.2     241     /    99.8          2.41
e+    out                     1.00 cm      4.2   4.2     268     /    99.9          2.68
e+    out                     0.20 cm      4.2   4.2     692     /    200           3.46
e+    in                      0.20 cm      4.2   4.2     1178    /    199.9         5.89
e+    in                      0.20 cm      4.2   5.8     724     /    200           3.62