MAGNETRON AS GENERATOR Ol< CENTIMETER WAVES 



229 



modes of the component systems, that is, modes of the same pattern period- 

 icity, add in phase or tt radians out of phase. Thus the modes of a "rising 

 sun" system having eighteen resonators corresponding to n = 0, 1, 2, • • • , 

 8, and 9 are to be compounded of the two sets of modes for the large and 



01 23456 789 



mode: number, n 



Fig. 27. — Plots of mode wavelength as a function of mode number for three different 

 resonator systems of eighteen resonators having the same axial length and tt mode wave- 

 length. Curve (a) is for an unstrapped resonator sj'stem of identical resonators. Curve 

 {!)) is for a "heavily" strapped resonator system having identical resonators. Curve {c) is 

 for a "rising sun" type resonator system having a ratio of resonator wavelengths of 1.8. 



small resonators, each set including modes of periodicities n' = 0, 1, 2, 3' 

 and 4. The two n' = modes when added in phase give the « = mode 

 of the whole system but when added tt radians out of phase give the « = 9 

 or TT mode of the whole resonator system. This latter fact is perhaps made 

 more clear by the observation that in the n = 9 or tt mode all the large 



