Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

:7.MODULATION BY ELECTRON BEAMS 501The fringe effects on entering the space between the parallel planes arenegligible, for the electrons are assumed to enter at x = 0. Fromintegration of (6)x = + E nm 2o>-9(e VJ — 1) efa *.(102)Iffe fat/,=I'olE n2dm o),0(e«-l).The total current can be regarded as the sum of two parts, so thatI — I1 + I fwhere l x is given by (9)I =I'd M T*Eo(e'0-1) + (l + id-eW)2d m 1over-all admittance including fringe-field effects.L- j/ |1 — cos4d 2VO)(103)(sin d) 1tt)-,—+ i-It isclear from the above that, for small transit times through thefringe field, the contribution to the image currents from the fringeelectrons is of the same order of magnitude of terms already neglectedin this theory and should be neglected here.