Solenoid Magnet

Solenoid Test

100 million e- incident on the target. Created 97997 Positrons. Target is 2 mm thick Lead-Bismuth target, which yields most positrons. 48 mm diameter virtual detector is placed 500mm down of the target to detect e+.

20 cm long solenoid

Solenoid Inner radius=100 mm outer radius=120 mm length=200 mm. Target planced at the center of the solenoid.

I(A) e+      B(T)@Target
10    6183   0.169142 
20   13675   0.338283 
30   16581   0.507425 
40   18576   0.676566
50   21317   0.845708
60   25011   1.014849
70   28613   1.183991
-70  28639  -1.183991
80   31643   1.353132
90   34540   1.522274 
200  59433   3.382830
400  78415   6.765661
800  84885   13.531321

20 cm long solenoid

Solenoid Inner radius=100 mm outer radius=120 mm length=400 mm. Target planced at the center of solenoid.

I(A) e+      B(T)@Target
23   19359   0.506451 
30   23897   0.660589
45   32971   0.990883
60   41050   1.321178 

The longer the solenoid, the more positrons delivered to the detector.

off center placement

Solenoid Inner radius=100 mm outer radius=120 mm length=400 mm. Target placed 100 mm down of the top of the solenoid. Some positrons went backward (i.e. upstream) to the e- incident direction. I gave up this setup.