Collisional broadening of nonlinear resonant wave-particle interactions

Catto, Peter J.; Tolman, Elizabeth A.

doi:10.7910/DVN/ZBK2QZ

Title: Collisional broadening of nonlinear resonant wave-particle interactions

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Abstract

A general procedure for understanding plasma behavior when resonant wave-particle interactions are the sole destabilizing and transport mechanism or only heating and/or current drive source is highlighted without recourse to involved numerical or analytical treatments. These phenomena are characterized by transport that appears to be collisionless even though collisions play a central role in narrow collisional boundary layers. The order of magnitude estimates, which include nonlinear effects, are shown to provide expressions in agreement with the principle results of recent toroidal Alfvén eigenmode (TAE), toroidal magnetic field ripple, and heating and current drive treatments. More importantly, the retention of nonlinearities leads to new estimates of the alpha particle energy diffusivity at saturation for TAE modes, and the ripple threshold at which superbanana plateau evaluations of alpha particle transport are modified by nonlinear radial drift effects. In addition, the estimates indicate when quasilinear descriptions for heating and current drive will begin to fail. The phenomenological procedure demonstrates that in magnetic fusion relevant plasmas narrow collisional boundary layers must be retained for resonant wave-particle interactions as they enhance the role of collisions, and make stochastic particle motion unlikely to be more important than other nonlinear process.

Authors:

Catto, Peter J.; Tolman, Elizabeth A.

OSTI

Publication Date:: Mon Nov 01 00:00:00 EDT 2021

DOE Contract Number:: FG02-91ER54109

Research Org.:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

OSTI Identifier:: 1886672

DOI:: https://doi.org/10.7910/DVN/ZBK2QZ

Citation Formats


                    Catto, Peter J., and Tolman, Elizabeth A. Collisional broadening of nonlinear resonant wave-particle interactions.  United States: N. p., 2021. 
        Web.  doi:10.7910/DVN/ZBK2QZ.

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                    Catto, Peter J., & Tolman, Elizabeth A. Collisional broadening of nonlinear resonant wave-particle interactions.  United States.  doi:https://doi.org/10.7910/DVN/ZBK2QZ

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                    Catto, Peter J., and Tolman, Elizabeth A. 2021.  
"Collisional broadening of nonlinear resonant wave-particle interactions".  United States.  doi:https://doi.org/10.7910/DVN/ZBK2QZ.  https://www.osti.gov/servlets/purl/1886672. Pub date:Mon Nov 01 00:00:00 EDT 2021

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@article{osti_1886672,

  title        = {Collisional broadening of nonlinear resonant wave-particle interactions},

  author       = {Catto, Peter J. and Tolman, Elizabeth A.},

  abstractNote = {A general procedure for understanding plasma behavior when resonant wave-particle interactions are the sole destabilizing and transport mechanism or only heating and/or current drive source is highlighted without recourse to involved numerical or analytical treatments. These phenomena are characterized by transport that appears to be collisionless even though collisions play a central role in narrow collisional boundary layers. The order of magnitude estimates, which include nonlinear effects, are shown to provide expressions in agreement with the principle results of recent toroidal Alfvén eigenmode (TAE), toroidal magnetic field ripple, and heating and current drive treatments. More importantly, the retention of nonlinearities leads to new estimates of the alpha particle energy diffusivity at saturation for TAE modes, and the ripple threshold at which superbanana plateau evaluations of alpha particle transport are modified by nonlinear radial drift effects. In addition, the estimates indicate when quasilinear descriptions for heating and current drive will begin to fail. The phenomenological procedure demonstrates that in magnetic fusion relevant plasmas narrow collisional boundary layers must be retained for resonant wave-particle interactions as they enhance the role of collisions, and make stochastic particle motion unlikely to be more important than other nonlinear process.},

  doi          = {10.7910/DVN/ZBK2QZ},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Mon Nov 01 00:00:00 EDT 2021},

  month        = {Mon Nov 01 00:00:00 EDT 2021}

}

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DOI: https://doi.org/10.7910/DVN/ZBK2QZ

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