UJ 



a 



CL 



20 

 15 



10 



6 8 10 12 14 



Z IN INCHES ALONG DRIFT TUBE (0 IS 0.95" FROM ANODE) 

 B = 954 GAUSS, Bc = 37 GAUSS, V=2200 VOLTS, 1 = 36 MA 



15 



18 



Fig. 9 — Two strong klystron signals are impressed on the beam as in Fig. 8, 

 and noise power at their difference-frequency recorded, both with and without 

 these signals present. The deep noise minima in (b) are due to destructive inter- 

 ference between trains of waves excited by intermodulation at different positions 

 along the beam. 



850 



Jil 



