652 



BELL SYSTEM TECHNICAL JOURNAL 



240 



200 



160 



140 



uj 80 



a. 



\3 



Z 60 



O 40 



a 20 



-20 



-60 



■100 



04 8 I 



2 1.6 2.0 2.4 2.8 



BUNCHING PARAMETER, X 



Fig. 131. — Phase of electronic admittance vs bunching parameter for .several repeller 

 modes. 



