Finite conductivity and the interface filamentation instability in railgun arcs

Manuel Huerta, M. Bourouis

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We use a first order perturbation expansion of the MHD equations to study the filamentation instability on the plasma-vacuum interface of plasma arcs accelerated by magnetic fields. We model the arc in the same way as Decker, including the effects of finite conductivity σ, but consider perturbations with wave vector k parallel to the magnetic field B. A fourth order mode equation is derived and solved numerically. We find complicated unstable modes, but largely in a region of very small k, beyond the limit of interest in railguns. This instability is therefore much less disrupting than the interchange instability in the parameter ranges we have explored.

Original languageEnglish (US)
Pages (from-to)257-260
Number of pages4
JournalIEEE Transactions on Magnetics
Volume27
Issue number1
DOIs
StatePublished - Jan 1 1991
Externally publishedYes

Fingerprint

Rail guns
arcs
Magnetic fields
Plasmas
conductivity
Plasma stability
Interchanges
Magnetohydrodynamics
disrupting
perturbation
Vacuum
magnetic fields
plasma jets
vacuum
expansion

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy (miscellaneous)

Cite this

Finite conductivity and the interface filamentation instability in railgun arcs. / Huerta, Manuel; Bourouis, M.

In: IEEE Transactions on Magnetics, Vol. 27, No. 1, 01.01.1991, p. 257-260.

Research output: Contribution to journalArticle

@article{e90f892e6ec743f78d7a337a422bac2f,
title = "Finite conductivity and the interface filamentation instability in railgun arcs",
abstract = "We use a first order perturbation expansion of the MHD equations to study the filamentation instability on the plasma-vacuum interface of plasma arcs accelerated by magnetic fields. We model the arc in the same way as Decker, including the effects of finite conductivity σ, but consider perturbations with wave vector k parallel to the magnetic field B. A fourth order mode equation is derived and solved numerically. We find complicated unstable modes, but largely in a region of very small k, beyond the limit of interest in railguns. This instability is therefore much less disrupting than the interchange instability in the parameter ranges we have explored.",
author = "Manuel Huerta and M. Bourouis",
year = "1991",
month = "1",
day = "1",
doi = "10.1109/20.101036",
language = "English (US)",
volume = "27",
pages = "257--260",
journal = "IEEE Transactions on Magnetics",
issn = "0018-9464",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "1",

}

TY - JOUR

T1 - Finite conductivity and the interface filamentation instability in railgun arcs

AU - Huerta, Manuel

AU - Bourouis, M.

PY - 1991/1/1

Y1 - 1991/1/1

N2 - We use a first order perturbation expansion of the MHD equations to study the filamentation instability on the plasma-vacuum interface of plasma arcs accelerated by magnetic fields. We model the arc in the same way as Decker, including the effects of finite conductivity σ, but consider perturbations with wave vector k parallel to the magnetic field B. A fourth order mode equation is derived and solved numerically. We find complicated unstable modes, but largely in a region of very small k, beyond the limit of interest in railguns. This instability is therefore much less disrupting than the interchange instability in the parameter ranges we have explored.

AB - We use a first order perturbation expansion of the MHD equations to study the filamentation instability on the plasma-vacuum interface of plasma arcs accelerated by magnetic fields. We model the arc in the same way as Decker, including the effects of finite conductivity σ, but consider perturbations with wave vector k parallel to the magnetic field B. A fourth order mode equation is derived and solved numerically. We find complicated unstable modes, but largely in a region of very small k, beyond the limit of interest in railguns. This instability is therefore much less disrupting than the interchange instability in the parameter ranges we have explored.

UR - http://www.scopus.com/inward/record.url?scp=0025796527&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0025796527&partnerID=8YFLogxK

U2 - 10.1109/20.101036

DO - 10.1109/20.101036

M3 - Article

VL - 27

SP - 257

EP - 260

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 1

ER -