Accession Number : AD0609165

Title :   LINEAR THEORY OF AN MHD OSCILLATOR,

Corporate Author : AVCO EVERETT RESEARCH LAB EVERETT MASS

Personal Author(s) : McCune,James E.

Report Date : DEC 1964

Pagination or Media Count : 39

Abstract : The linear theory of AC fluctuations in an MHD channel subject to the Hall instability of Velikhov ('Hall instability of current-carrying slightly-ionized plasmas'. Symp. MPD. Elec. Power Gen., Newcastle-upon-Tyne, 1962) is explored. It is shown that the system as a whole (plasma, plus boundaries, plus external circuitry) is stable to the Velikhov mode except at certain resonant acoustic frequencies. If these resonant frequencies are excited, channels of sufficient size can be made to oscillate and produce net AC power. However, non-linear effects limit the AC power level severely for this geometry, and adversely affect the DC performance of the channel. The analysis shows that resonant fluctuations can be controlled by external circuitry. (Author)

Descriptors :   (*MAGNETOHYDRODYNAMICS, OSCILLATORS), (*OSCILLATORS, LINEAR SYSTEMS), GENERATORS, ELECTRIC POWER PRODUCTION, ENERGY CONVERSION, HALL EFFECT, THEORY, ALTERNATING CURRENT, DIRECT CURRENT, GAS IONIZATION, GASES, PLASMAS(PHYSICS), ELECTROMAGNETIC RADIATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE