DISCONTINUITIES 



417 



A 



Fig. 9.2^When the gain is large we need consider the increasing wave only. Using 

 this approximation, the gain in db is .1 + BCN db. Here A is shown vs the velocity param- 

 eter b, several values of the attenuation parameter d, for no space charge (QC = 0). 



0.2 0.4 0.6 0.8 1.0 1.2 1.4 



d 

 Fig. 9.3— .4 vs ^ for 6 = and QC = 0. 



In Fig. 9.2, A is plotted vs b for these three values of d. 



It is perhaps of some interest to plot A vs d iox b — (the electron veloc- 

 ity equal to the phase velocity of the undisturbed wave). Such a plot is 

 shown in Fig. 9.3. 



