On the Nonconservation of Noise Parameters in Multivelocity Beams
- 1 March 1960
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 31 (3) , 454-458
- https://doi.org/10.1063/1.1735607
Abstract
Macroscopic equations for conservation of charge, momentum, and energy, as derived from the Boltzmann equation, are applied to an electron stream having a velocity spread. For small velocity spreads, these equations are simple to treat. The noise parameters, S and Π, which determine the minimum noise figure of a beam‐type microwave tube, lose their invariance in the presence of velocity spread; they become functions of position. The changes of S and Π are such as to lower the minimum noise figure. These results are in agreement with a detailed numerical solution of the Boltzmann equation as previously reported by others.This publication has 4 references indexed in Scilit:
- New Mechanism of Noise Reduction in Electron BeamsJournal of Applied Physics, 1959
- Density-Function Calculations of Noise Propagation on an Accelerated Multivelocity Electron BeamJournal of Applied Physics, 1957
- Effect of Thermal-Velocity Spread on the Noise Figure in Traveling-Wave TubesJournal of Applied Physics, 1952
- Effect of Hydrostatic Pressure in an Electron Beam on the Operation of Traveling-Wave DevicesJournal of Applied Physics, 1951