Accession Number:

ADA636265

Title:

Comparison of Theory and Simulation for a Radially-Symmetric Transit-Time Oscillator

Descriptive Note:

Conference paper

Corporate Author:

AIR FORCE RESEARCH LAB KIRTLAND AFB NM

Personal Author(s):

Report Date:

1999-06-01

Pagination or Media Count:

5.0

Abstract:

The transit-time effect in a coaxial structure has been used by Arman l to design low impedance high power microwave devices that use no externally generated magnetic fields and have no confining foils. Luginsland 2 have developed simple one-dimensional 1D nonlinear circuit equations that are solved numerically to estimate key device characteristics. This paper extends this approach to analytically estimate the values of the free parameters used in the circuit equations, compares the analytical values to similar values derived from two-dimensional 2D particle-in-cell simulations, and compares the results of numerical solutions of the 1D circuit equations, 2D simulations, and initial experimental data. It is shown that the non-linear relationship between voltage and current emission in a space charge limited diode drives an RF oscillation whose frequency is determined by the resonant characteristics of the annular diode cavity. The results from the 1D analysis and 2D particle-in-cell PIC simulation are shown to be in excellent agreement.

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE