A Noise Theory for the Magnetron. I. The Temperature Limited Low Current Densit Magnetron

Abstract

In Part I of this paper a noise theory is given for a temperature limited magnetron, valid for sufficiently low current densities, from which one can calculate the shot noise produced by such a tube in terms of the magnetron parameters and of the orbit of an individual electron. This theoretical noise output is compared with that actually produced by an experimental c-w magnetron type QK61 and two important differences are noted. The observed noise is as much as 30 db above the theoretical shot noise under certain conditions, while the observed rate of change of noise power with plate voltage is many times greater than that predicted for the theoretical shot noise. A general discussion of the possible origins of this excess noise is given and a theory to explain it is given in Part II of this paper, Technical Reports Nos. 117 and 118.

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Document Details

Document Type
Technical Report
Publication Date
Nov 20, 1949
Accession Number
ADA459319

Entities

People

  • R. Q. Twiss

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Current Density
  • Electric Fields
  • Electrical Engineering
  • Electromagnetic Fields
  • Electromagnetic Radiation
  • Emission
  • Frequency
  • Impedance
  • Magnetic Fields
  • Magnetrons
  • Measuring Instruments
  • Resonant Circuits
  • Resonant Frequency
  • Scattering
  • Shot Noise
  • Tuned Circuits

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Computational Modeling and Simulation
  • Electrical Engineering

Technology Areas

  • Microelectronics
  • Space
  • Space - Hall-Effect Thruster