10 research outputs found
On deformation of electron holes in phase space
This Letter shows that for particularly shaped background particle
distributions momentum exchange between phase space holes and the distribution
causes acceleration of the holes along the magnetic field. In the particular
case of a non-symmetric ring distribution (ring with loss cone) this
acceleration is nonuniform in phase space being weaker at larger perpendicular
velocities thus causing deformation of the hole in phase space.Comment: Original MS in EPL style, 1 Figur
Width-amplitude relation of Bernstein-Greene-Kruskal solitary waves
Inequality width-amplitude relations for three-dimensional
Bernstein-Greene-Kruskal solitary waves are derived for magnetized plasmas.
Criteria for neglecting effects of nonzero cyclotron radius are obtained. We
emphasize that the form of the solitary potential is not tightly constrained,
and the amplitude and widths of the potential are constrained by inequalities.
The existence of a continuous range of allowed sizes and shapes for these waves
makes them easily accessible. We propose that these solitary waves can be
spontaneously generated in turbulence or thermal fluctuations. We expect that
the high excitation probability of these waves should alter the bulk properties
of the plasma medium such as electrical resistivity and thermal conductivity.Comment: 5 pages, 2 figure
Observations of Solitary Structures in a Magnetized, Plasma Loaded Waveguide
Two types of solitary structure were investigated experimentally and numerically in a magnetized, plasma-loaded waveguide. One was identified as an ordinary KdV soliton and its properties were investigated with particular attention to the damping by resonant particles. The other type of pulse was identified as a purely kinetic phenomenon being associated with a vortex in phase space. © 1979 IOP Publishing Ltd
Stability of a stationary double layer
Electrostatic oscillations in a stationary beam double layer are studied in the hydrodynamic approximation. An analysis of the solutions to the linearized equations for perturbations shows that the double layer in an unbounded plasma may be subject only to convective instability, in which case the perturbations localized inside the region of the potential jump escape from the plasma without distorting the steady field structure. The double layer in a bounded plasma is investigated numerically by a particle-in-cell method. It is established that, as is the case in the Pierce system, the governing role in the stability of the double layer is played by the field of the charges induced on the surfaces of the conducting electrodes. © 2002 MAIK "Nauka/Interperiodica"