Alpha particle transport in the presence of ballooning type electrostatic driftwaves

Research output: Contribution to journalArticle

Abstract

Employing Hamiltonian mechanics, the transport of fusion born alpha particles in the presence of driftwave turbulence is investigated. An analytical turbulence model based on the toroidal drift eigenmode is employed for guiding center orbit-following calculations. It is shown that high energy particles are less susceptible to driftwave turbulence. The passing particle transport is due to overlapping of guiding center electric islands whose widths are inversely proportional to the square root of the parallel velocity. For trapped particles, through a coordinate transformation from the poloidal angle and the parallel velocity to the action-angle variables, the resonance between the bounce motion and the toroidal precession motion, which can cause secondary island formation in the phase space, is demonstrated.

Original languageEnglish
Article number073016
JournalNuclear Fusion
Volume55
Issue number7
DOIs
Publication statusPublished - 2015 Jul 1

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alpha particles
turbulence
electrostatics
trapped particles
coordinate transformations
turbulence models
particle energy
precession
fusion
orbits
causes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

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abstract = "Employing Hamiltonian mechanics, the transport of fusion born alpha particles in the presence of driftwave turbulence is investigated. An analytical turbulence model based on the toroidal drift eigenmode is employed for guiding center orbit-following calculations. It is shown that high energy particles are less susceptible to driftwave turbulence. The passing particle transport is due to overlapping of guiding center electric islands whose widths are inversely proportional to the square root of the parallel velocity. For trapped particles, through a coordinate transformation from the poloidal angle and the parallel velocity to the action-angle variables, the resonance between the bounce motion and the toroidal precession motion, which can cause secondary island formation in the phase space, is demonstrated.",
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Alpha particle transport in the presence of ballooning type electrostatic driftwaves. / Nishimura, Y.; Huang, B.; Cheng, C. Z.

In: Nuclear Fusion, Vol. 55, No. 7, 073016, 01.07.2015.

Research output: Contribution to journalArticle

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