Beam Test Jul 20 2012

We started up the accelerator where we left from yesterday.

Tune

Energy Switch	Out (High En)
Solenoid 1	6.1 A
Solenoid 2	3.2 A
Gun Hor	-0.2 A
Gun Ver	0 A
Output Hor	-0.3 A
Output Ver	0 A
Rep Rate	8
Gun HV	10 (Knob Setting)
Gun Grid Voltage	2.85 (Knob Setting)
RF frequency	2856.310 MHz
Modulator HV Power Supply	4.28 (Knob Setting)
RF macro Pulse Length (FWHM)	300 ns
Q1 (A)	-3.7
Q2 (A)	-5.5
Q3 (A)	+0.6

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.

quad settings after T1 (Target 1, positron production target).

q4     q5    q6     q7    q8     q9     q10        
-0.0   +0.5  +0.0   +0.0  -1.0   -0.0   +0.0

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         2.2
e+    out                     1.00 cm      4.2   4.2     545     /    199.9         2.7
e+    in                      1.00 cm      4.2   4.2     241     /    99.8          2.4
e+    out                     1.00 cm      4.2   4.2     268     /    99.9          2.7
e+    out                     0.20 cm      4.2   4.2     692     /    200           3.5
e+    in                      0.20 cm      4.2   4.2     1178    /    199.9         5.9
e+    in                      0.20 cm      4.2   5.8     724     /    200           3.6
e+    out                     0.20 cm      4.2   5.8     1175    /    299.9         3.9

Added 10 inches of Polyethylene brick wall to shield detector left.

Mode  Annihilation Target     Slit width   D1(A) D2(A)   Counts  /    Time(s)     Rate(Hz)
e+    out                     0.20 cm      4.2   5.8     942     /    200         4.7
e+    in                      0.20 cm      4.2   5.8     960     /    200.1       4.8
e+    in                      0.20 cm      4.2   4.2     1037    /    199.8       5.2
e+    out                     0.20 cm      4.2   4.2         /   

q4     q5    q6     q7    q8     q9     q10        
-0.0   +0.5  +0.4   +4.5  -1.0   -0.0   +0.0