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

Beam left detector is at 14.5 cm from the edge of the 6-way cross. Beam right detector is pushed right next to the edge of the 6-way cross.

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     1106    /    199.9       5.5

Changed to optimized value from yesterday.

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

Mode  Annihilation Target     Slit width   D1(A) D2(A)   Counts  /    Time(s)     Rate(Hz)
e+    out                     0.20 cm      4.2   4.2     1213    /    200.3       6.1
e+    in                      0.20 cm      4.2   4.2     1221    /    199.9       6.1

Beam left detector is moved to 7 cm from the edge of the 6-way cross.

Mode  Annihilation Target     Slit width   D1(A) D2(A)   Counts  /    Time(s)     Rate(Hz)
e+    in                      0.20 cm      4.2   4.2      657    /      220.1      3.0
e+    out                     0.20 cm      4.2   4.2      537    /      200        2.7

Beam left detector is moved to 3 cm from the edge of the 6-way cross.

Mode  Annihilation Target     Slit width   D1(A) D2(A)   Counts  /    Time(s)     Rate(Hz)
e+    out                     0.20 cm      4.2   4.2     659     /    200         3.3
e+    in                      0.20 cm      4.2   4.2     965     /    200         4.8

Chad's Tune

max 2 MeV electron

Chad optimized the 12 MeV transmission on the 90 deg FC, then

Energy Switch	Out (High En)
Solenoid 1	12 A
Solenoid 2	5.5 A
Gun Hor	-0.2 A
Gun Ver	-0.4 A
Output Hor	-1 A
Output Ver	-0.3 A
Rep Rate	7
Gun HV	10 (Knob Setting)
Gun Grid Voltage	10 (Knob Setting)
RF frequency	2856.269 MHz
Modulator HV Power Supply	4.19 (Knob Setting)
RF macro Pulse Length (FWHM)	300 ns
Q1 (A)	-0.3
Q2 (A)	-0.7
Q3 (A)	+1.6

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

D1   D2      q4     q5    q6     q7    q8     q9     q10        
4.2  4.41    +6.5   -3.7  -1.1   +1.5  +0.2   +0.3   +0.0

Voltage on the Sintilator PMT: 1068 V