2 

 1 







- I 



-2 



2 



1 





 -1 

 -2 



D 

 U 



tr 



< 



_] 

 UJ 



cc 



Q 

 Z 

 < 



u 

 o 

 z 

 < 



I 

 o 



o 

 o 



z 

 o 

 ct 



> 



UJ 



a. 



1 

 



- 1 



-2 

 2 



, 1 

 •0 



- I 



-2 

 -3 



2 



I 

 



- 1 

 -2 

 -3 



240 



180 



120 



60 



RELATIVE PHASE 



IN 



60 120 



DEGREES 



180 



240 



Fig. 7 — Curves of current and velocity as a function of phase for various input 

 levels. The velocity becomes multivalued at a very low level, a tail forming a 

 nucleus for a second electron bunch which eventually caused saturation in the 

 output. For this run C = 0.1 Q,C = 0.06, t^o = 0.4 and h = 0.26. 



850 



