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.
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