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in EXPERIMENTAL SETUP
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18 DRIFT LENGTH Amps Axial Distance Axial Magnetic Field beam analyzer beam center beam edge beam pulse beam scalloping beam under investigation beam voltage Brillouin beam Brillouin field capacitor cathode cavity clamping circuit d-c current density diode DRIFT LENGTH INCHES effective plasma wavelength electron beam electron gun Excitation Frequency experimental Faraday cage filament phasing gain band growing noise wave growth factor higher frequencies higher magnetic fields kMc/s louin beam low magnetic fields Mathieu diagram Mathieu equation maximum growth rate measurements modulations multivibrator noise build-up noise figure noise growth rate noise pattern Noise Power versus noise saturation noise standing wave noise voltage noise-measuring circuit noise-measuring equipment noisy regions nonlinear peak velocity growth perveance plasma-reduction factor Pulse Delay Unit pulse length radial noise data Relative Noise Power Rigrod scallop wavelength scalloped beam amplification shot noise square wave theoretical tion traveling-wave tube usec values velocity modulation versus magnetic field voltage