Accession Number : ADA184618

Title :   Current-Filamentation Instability in Railgun Arcs.

Descriptive Note : Memorandum rept.,

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Powell,John D

PDF Url : ADA184618

Report Date : Jun 1987

Pagination or Media Count : 30

Abstract : We extend some previous analysis of Rayleigh-Taylor instabilities in railgun arcs to treat the current-filamentation instability. The basic model is similar to that used in our previous treatment of the interchange instability, and the formalism is adapted from that developed by Tsai, Liskow, and Wilcox. It is demonstrated that railgun arcs are indeed unstable to the formation of current filaments for any nonzero value of the acceleration. However, numerical solution of the appropriate eigenvalue problem suggests that the growth rates of the unstable modes are generally too small, and the wavelengths generally too large, for the instability to be of much practical importance.

Descriptors :   *ELECTRIC GUNS, *ELECTRIC ARCS, STABILITY, ELECTRIC CURRENT, FILAMENTS, PLASMAS(PHYSICS)

Subject Categories : Plasma Physics and Magnetohydrodynamics
      Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE