UJ 



(t 



UJ 



o. 

 2 

 < 



_i 

 _i 



2 



Z 



- 2 



a. 



D 



UJ 



z 



O 



Q- 

 (O 



(r 

 o 





25 

 20 

 1 5 



1 



10 



- 5 

 O 



UJ 

 Q 



2 4 6 8 10 12 14 16 



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

 B=26.0 GAUSS, Bc=-2I.3 GAUSS, V=2200 VOLTS, 1 = 41.6 MA PEAK 



18 



Fig. 2 — The fields have been adjusted lor ma.ximuni amplitude of the .V = 1 

 proper frequency, 77.8 mc, at a reference probe position {z = 15 inches). The 

 synchronized probe records indicate three distinct maxima of this proper fre- 

 quency near the beam waist. 



860 



■-'\ 



