Journal ArticleDOI
MHD Instabilities Developing to Alfven Waves Observed during Plasma Production by MPD Arcjet
TLDR
In this article, two kinds of magnetohydrodynamic (MHD) instabilities excited in a current-carrying cylindrical plasma that was produced by a magneto-plasma-dynamic arcjet were observed.Abstract:
We have observed two kinds of magnetohydrodynamic (MHD) instabilities excited in a current-carrying cylindrical plasma that was produced by a magneto-plasma-dynamic (MPD) arcjet. The “net current” in the plasma excites the instability with the azimuthal mode number m =1, which is deduced to be a kink mode from MHD theory. On the other hand, the m =0 instability is excited by the “total current” flowing to the cathode, and this mode was found to be responsible for the modulation of electron temperature. They are converted respectively to m =1 compressional Alfven wave and m =0 global Alfven eigenmode, propagating along the axial magnetic field in the current-free region.read more
Citations
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Journal ArticleDOI
Kink instability in applied-field magneto-plasma-dynamic thrusters.
Matteo Zuin,Roberto Cavazzana,Emilio Martines,Gianluigi Serianni,V. Antoni,Mario Bagatin,Mariano Andrenucci,Fabrizio Paganucci,P. Rossetti +8 more
TL;DR: Measurements of magnetic and electrostatic fluctuations in an applied field magneto-plasma-dynamic thruster have shown that a m/n=1/1 kink mode becomes unstable whenever the Kruskal-Shafranov limit is violated.
Journal Article
Excitation of mhd surface waves propagating with shear alfven waves in an inhomogeneous cylindrical plasma
Y. Amagishi,K. Saeki +1 more
TL;DR: In this article, the MHD surface waves or fast waves of m=+or-1 have been excited in the range of frequency less than ion cyclotron frequency using a helical antenna in a finite beta and cylindrical plasma, and their dispersion relation and spatial structure were successfully confirmed after the wave signals were separated from those of the local shear Alfven waves that propagated together with the surface waves.
Journal ArticleDOI
Critical regimes and magnetohydrodynamic instabilities in a magneto-plasma-dynamic thruster
Matteo Zuin,Roberto Cavazzana,Emilio Martines,G. Serianni,V. Antoni,Mario Bagatin,Mariano Andrenucci,Fabrizio Paganucci,P. Rossetti +8 more
TL;DR: In this paper, an extensive experimental investigation of magnetic and electrostatic fluctuations in a magneto-plasma-dynamic (MPD) thruster, with and without the application of an external magnetic field, has shown that gross magnetohydrodynamic instabilities develop whenever the current rises beyond a threshold value.
Journal ArticleDOI
Global Alfvén Wave Heating of the Magnetosphere of Young Stars
TL;DR: In this paper, a global Alfven wave (GAW) was proposed as a viable mechanism to explain plasma heating in the magnetosphere of young stars, which is compatible with the requirement that the dissipation length of GAWs be comparable to the distance between the shocked region at the star's surface and the truncation region in the accretion disk.
Journal ArticleDOI
Magnetohydrodynamic Modes in a Current-Carrying Inhomogeneous Plasma
TL;DR: Magnetohydrodynamic (MHD) modes with m = ± 1 (m : azimuthal mode number) in a current-carrying in homegeneous plasma are numerically investigated on the basis of wave equations derived from MHD equations, which include effects of finite ion-cyclotron frequency and ion neutral collisions.
References
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Journal ArticleDOI
Spectrum of low‐frequency, nonaxisymmetric oscillations in a cold, current‐carrying plasma column
TL;DR: In this article, the spectrum of a homogeneous, currentless, cylindrical plasma cylinder was obtained from an analytical dispersion relation and the connection of the magnetohydrodynamic (MHD) kink and internal kink instabilities with the global eigenmodes of the Alfven wave was evidenced.
Journal Article
Geometrical effects on resonant absorption of MHD-waves
S. Succi,K. Appert,J. Vaclavik +2 more
TL;DR: The CRPP-ARTICLE-1983-008 view record in Web of Science Record created on 2008-04-16, modified on 2017-05-12 as discussed by the authors was created on 2016-07-12.
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The Alfvén wave spectrum as measured on a tokamak
TL;DR: In this paper, detailed experimental data obtained on the TCA tokamak were presented concerning the antenna loading and wave fields as a function of the Alfven wave spectrum and the conclusions relevant to the design of an antenna system have been stressed.
Journal ArticleDOI
Electromagnetic effects in an applied-field magnetoplasmadynamic thruster
Yoshihiro Arakawa,Akihiro Sasoh +1 more
TL;DR: In this article, the performance and thrust production mechanisms of an applied-field magnetoplasm-adynamic thruster were investigated, and it was found that the thruster operation is characterized by a parameter, B-squared/m (B: applied magnetic field strength, m: propellant mass flow rate).
Journal ArticleDOI
MHD surface waves in a resistive cylindrical plasma at low to ion cyclotron frequency
TL;DR: In this article, the radial eigenmode of a nonaxisymmetric compressional wave in a cylindrical plasma surrounded by an insulating boundary is identified as a surface wave at low frequencies.