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B Calculation of S II for onedimensional model with
Experimental lownoise Xband TWT amplifier
2 other sections not shown
a)]1/2 versus distance actual beam Anode approximately assumption beam current beam drifting beam edge beam noisiness beam potential beam velocity best noise figure boundary calculated cathode characteristic functions convection current density cross-power-density spectrum d-c density function difference equation Doctor of Philosophy drift potential drift region drifting beam edge waves electric field electron beam electron gun frequency gives grid line grid point half-Maxwellian density function helix input condition input velocity class integrated j(be j(Pe kinetic modulation voltage Laplace transform linear low-noise low-potential region magnetic field minimum noise figure Noise parameter NOISE REDUCTION normalized potential one-dimensional analysis perturbation plasma wave number potential minimum power-density spectra propagation constant rectangular d-c density rectangular density function rectangular velocity reduced self-power-density spectrum sheet of current Siegman solution solved space charge space-charge waves strip beam strongly multivelocitous tube with best u)du uncorrelated velocity jump velocity modulation