20 



16 



UJ 



a. 



I 12 

 < 



5 



Z 



l- 

 Z 

 ui 

 tr 

 a. 



D 

 O 



UJ 



to 



z 

 o 



0. 

 (U 



q: 

 a 



o 



(- 

 o 



UJ 

 H 

 UJ 



o 



25 

 20 

 15 



10 



to 



_) 



UJ 



- 5 



UJ 



O 



4 6 8 10 12 14 16 



Z IN INCHES ALONG DRIFT TUBE (O IS 0.95" FROM ANODE) 

 8 = 85.9 GAUSS, Be = 1.2 GAUSS, V = 2200 VOLTS, I =40.8 MA PEAK 



18 



Fig. 4 — The fields have been adjusted for maximum amplitude, at the same 

 reference probe position, of a wave excited in the diode, with frequency unafTected 

 by the magnetic field, 165 mc. The cyclotron frequency for this field is 240.2 mc. 



862 



