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A stochastic mechanism of electron heating
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10.1063/1.4742988
/content/aip/journal/pop/19/8/10.1063/1.4742988
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/8/10.1063/1.4742988
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Electrons interacting at Landau resonance (1) with oblique Langmuir or lower hybrid waves diffuse along the dashed lines. After falling in resonance with lower hybrid wave packets (phase speed ), resonant interaction at anomalous Doppler resonance (5) makes them move along the solid circles. The overall motion of electrons simultaneously interacting with wave packets through different resonances (Čerenkov and cyclotron) is not just diffusion in pitch angle but stochastic diffusion in perpendicular velocity (or in energy) as well.

Image of FIG. 2.
FIG. 2.

Contour plots of the electron distribution function formed when electrons interact simultaneously with both types of waves through two types of resonance (Čerenkov and cyclotron) The snapshots are taken at t = 0, 6, 152, 278, 308, 325, 358, 404 (from left to right then top to bottom). All velocities are in units of initial plasma thermal velocity with logarithmic rescaling of contour levels.

Image of FIG. 3.
FIG. 3.

Contour plots of the electron distribution function when interactions at Landau and cyclotron resonances are modeled separately. Cyclotron electron-wave interaction was switched on after interaction at Landau resonance that created the plateau was switched off. The snapshots are taken at t = 152, 265, 300, 306, 311, 431 . All velocities are in units of initial plasma thermal velocity with logarithmic rescaling of contour levels.

Image of FIG. 4.
FIG. 4.

Temporal dynamics of the wave energy, kinetic energy of electrons, and electron perpendicular temperature for the dense beam case ( ). The lower panel corresponds to the case of simultaneous resonance interactions shown in Figure 2 and the upper panel corresponds to the second case when resonant interactions of electrons with waves were treated independently (Figure 3 ). The total energy is conserved in both cases rather well, but internal distribution of energy is strikingly different, with twice as much energy channeled into perpendicular motions of electrons when both types of resonant interactions are working in concert. (Energy is in units of initial plasma kinetic energy of single degree of freedom).

Image of FIG. 5.
FIG. 5.

Temporal dynamics of the wave energy, kinetic energy of electrons, and electron perpendicular temperature for the case of sparse beam ( ). The lower panel corresponds to the case of simultaneous resonance interactions and the upper panel corresponds to the case when resonant interactions of electrons with waves were treated independently. Again, as for the dense beam, the total energy is conserved in both cases rather well, but internal distribution of energy is strikingly different, with twice as much energy channeled into perpendicular motions of electrons when both types of resonant interactions are working in concert. (Energy is in units of initial plasma kinetic energy of single degree of freedom).

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/content/aip/journal/pop/19/8/10.1063/1.4742988
2012-08-08
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A stochastic mechanism of electron heating
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/8/10.1063/1.4742988
10.1063/1.4742988
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