18 



(a) 



to 



-J 



UJ 



m 

 o 



UJ 



o 



UJ 



o 



Q. 

 UJ 



o 



Z 

 UJ 



> 



I- 

 < 



_l 



UJ 



35 



30 



25 



20 

 15 

 10 



5 





 40 



(c) 



450 500 550 600 635 



MAGNETIC FOCUSING FIELD IN GAUSS 

 V=2200 VOLTS, 1-38 MA, Z=17.10 INCHES 



Fig. 4 — With the probe stationary at about 18 inches from gun anode, collec- 

 tor current and noise powers in bands about 1 kmc apart are recorded, as current 

 in the main solenoid is varied from to 1.5 amperes (0 to 635 gauss). 



838 



