Chaotic transport and damping from θ-ruffled separatrices.

@article{Kabantsev2010ChaoticTA,
title={Chaotic transport and damping from $\theta$-ruffled separatrices.},
author={Andrey A. Kabantsev and Daniel H. E. Dubin and C. Fred Driscoll and Yu. A. Tsidulko},
journal={Physical review letters},
year={2010},
volume={105 20},
pages={
205001
}
}
Variations in magnetic or electrostatic confinement fields give rise to trapping separatrices, and neoclassical transport theory analyzes effects from collision-induced separatrix crossings. Experiments on pure electron plasmas now quantitatively characterize a broad range of transport and wave damping effects due to "chaotic" separatrix crossings, which occur due to equilibrium plasma rotation across θ-ruffled separatrices, and due to wave-induced separatrix fluctuations.
11 Citations

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References

SHOWING 1-10 OF 11 REFERENCES
Collisional transport in magnetized plasmas
• Physics
• 2002
1. Introduction 2. Kinetic and fluid descriptions of a plasma 3. The collision operator 4. Plasma fluid equations 5. Transport of a cylindrical plasma 6. Particle motion 7. Toroidal plasma 8.
Phys
• Rev. Lett. 89, 245001
• 2002
Sov
• Phys. JETP 16, 351 (1963). FIG. 6 (color online). Separatrix damping of a Langmuir wave: ðMÞ 11 from a weak magnetic mirror (red), and ðVsqÞ 11 (black) due to a ramped -symmetric negative Vsq (blue). FIG. 5 (color online). (a) (bottom, right scales) TPDM damping rate 1a times B versus applied m
• 2010
Phys
• Plasmas 16, 122103
• 2009
Phys
• Plasmas 15, 072112
• 2008
Phys
• Rev. Lett. 90, 015001
• 2003
Phys
• Fluids B 2, 1852
• 1990
Phys
• Plasmas 13, 058102 (2006); H. E. Mynick, Phys. Fluids 26, 2609
• 1983
Rev
• Mod. Phys. 48, 239
• 1976
Nucl
• Fusion 12, 3
• 1972