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1964 The paper absorption coefficient accuracy amplitude antenna approximation assumed attenuated Author's Abstract axis base boundary conditions Brillouin flux capacitance cathode code combination collector computation const coordinate corresponding cryostat crystal curvilinear coordinate dependence detection determined diffraction drift transistor effective absorption coefficient electron cloud energies equal equation 12 equivalent circuit expression formula frequency frequency modulation function g-n junction impurity centers integral equation interrogation Izvestia laser liquid helium magnetic potential maximum mean advantage measuring method mirrors modulation negative resistance NOISE STABILITY noise temperature nonlinear element obtain open cavity open waveguide optimal distribution oscilloscope over-all number paper studies paramagnetic paramagnetic amplifier parameters pass band plane plasma probability problem propagated proper oscillations pulse pumping quantities radar radiation Radiotekhnika i Elektronika ratio resonator satisfies segment semiconductor shown in Fig signal solution specified tank circuit temperature TOR system transistor transmission capacity tunnel diode two-dimensional variation velocity volt-ampere voltage wave waveguide