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Title: A one-dimensional model illustrating virtual-cathode formation in a novel coaxial virtual-cathode oscillator

Abstract

A one-dimensional electrostatic sheet model of a coaxial geometry Virtual Cathode Oscillator (VCO) is presented. The cathode is centrally located and connects to a peripherally located plate electrode to form a resonant cavity, and is thus considered to be a novel design. Charge is modelled as concentric sheets about the cathode whose absolute position and velocity are determined as a function of time by solving the relativistic equations of motion. The model predicts the formation of a virtual cathode between the grid and plate electrodes for the case of a space-charge limited current. Setting the electron reflexing frequency (as a function of the grid potential) comparable with the cavity resonant frequency is predicted to improve the efficiency of microwave emission.

Authors:
 [1]
  1. Council for Scientific and Industrial Research, PO Box 395, Pretoria 0001 (South Africa)
Publication Date:
OSTI Identifier:
22303653
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CATHODES; CURRENTS; DESIGN; EQUATIONS OF MOTION; GRIDS; MICROWAVE RADIATION; ONE-DIMENSIONAL CALCULATIONS; OSCILLATORS; RELATIVISTIC RANGE; SPACE CHARGE; TIME DEPENDENCE

Citation Formats

Turner, Geoffrey R., E-mail: gturner@csir.co.za. A one-dimensional model illustrating virtual-cathode formation in a novel coaxial virtual-cathode oscillator. United States: N. p., 2014. Web. doi:10.1063/1.4895500.
Turner, Geoffrey R., E-mail: gturner@csir.co.za. A one-dimensional model illustrating virtual-cathode formation in a novel coaxial virtual-cathode oscillator. United States. doi:10.1063/1.4895500.
Turner, Geoffrey R., E-mail: gturner@csir.co.za. Mon . "A one-dimensional model illustrating virtual-cathode formation in a novel coaxial virtual-cathode oscillator". United States. doi:10.1063/1.4895500.
@article{osti_22303653,
title = {A one-dimensional model illustrating virtual-cathode formation in a novel coaxial virtual-cathode oscillator},
author = {Turner, Geoffrey R., E-mail: gturner@csir.co.za},
abstractNote = {A one-dimensional electrostatic sheet model of a coaxial geometry Virtual Cathode Oscillator (VCO) is presented. The cathode is centrally located and connects to a peripherally located plate electrode to form a resonant cavity, and is thus considered to be a novel design. Charge is modelled as concentric sheets about the cathode whose absolute position and velocity are determined as a function of time by solving the relativistic equations of motion. The model predicts the formation of a virtual cathode between the grid and plate electrodes for the case of a space-charge limited current. Setting the electron reflexing frequency (as a function of the grid potential) comparable with the cavity resonant frequency is predicted to improve the efficiency of microwave emission.},
doi = {10.1063/1.4895500},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 9,
volume = 21,
place = {United States},
year = {2014},
month = {9}
}