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The nonlinear dynamics of a tearing mode interacting with an externally applied rotating field and a resistive wall is studied. A pair of coupled equations describing the evolution of the amplitude and frequency of a single tearing mode is derived and used in this study. The equations are valid...
The internal structure of the toroidicity-induced Alfvén eigenmode (TAE) is studied by comparing soft x-ray profile and beam ion loss data taken during TAE activity in the DIII-D tokamak W. W. Heidbrink et al., Nucl. Fusion 37 , 1411 (1997) with predictions from theories based on ideal...
Gyrotrons are typically driven by electron beams produced by magnetron-type thermionic electron guns operating in the regime of temperature limited emission. Very often, the current density in such annular electron beams is azimuthally nonuniform. To describe the effect of this nonuniformity on...
The physics of various low-frequency electrostatic and electromagnetic waves in a nonuniform magnetoplasma is revisited. It is shown that the approach of Saleem and Haque Phys. Plasmas 8 , 368 (2001) is misleading with regard to the electrostatic limit and the role of the quasineutrality...
It is found that high β β in low-aspect-ratio tori tends to stabilize the fishbone instability in a plasma with energetic circulating ions. The stabilization results from enhancement of the toroidal drift motion by large Shafranov shift, which makes it difficult to reconcile the condition of...
The upper and lower sidebands are measured on a traveling wave tube where a cold electron beam is trapped by a large amplitude wave. The two strongly coupled sidebands form a normal mode that is characterized by the sideband growth rates, wave number shifts, amplitude ratio, and phase...
On account of the presence of a dust beam parallel to the direction of the uniform magnetic field, the dust-kinetic Alfvén wave becomes unstable and grows in amplitude when the drift velocity of dust particles exceeds the parallel phase velocity of the wave. The instability growth rate depends...
Linear and nonlinear low-frequency modes in a magnetized electron plasma are studied, taking into account a proper description of the equilibrium plasma state that is inhomogeneous. Assuming a homogeneous magnetic field and sheared plasma flows, flute-like perturbations are studied in the...
The density limits for a series of shots in TEXTOR Tokamak Experiment for Technology Oriented Research, E. Hintz, P. Bogen, H. A. Claaßen et al., in Contributions to High-Temperature Plasma Physics , edited by K. H. Spatschek and J. Uhlenbusch (Akademie Verlag, Berlin, 1994, p. 373), over a...
Kinetic effects leading to the particle trapping are studied in a magnetized, inhomogeneous plasma configuration within the framework of the gyrokinetic theory in the frequency and spatial scale range that corresponds to the whistler waves. This treatment accounts for finite electron Larmor...
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