Ion orbit loss and poloidal plasma rotation in tokamaks

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Abstract

A momentum balance equation including the effect of ion orbit loss is employed to discuss the poloidal plasma rotation in tokamaks. It is found that in a steady state, the high-energy collisionless ions leave the system through an ion orbit loss mechanism and the low-energy collisional ions convect into the system as viscosity-driven flux in such a way that there is no net flux-surface-averaged radial current across the flux surface. The value of poloidal rotation necessary to maintain steady-state ambipolarity is different from that of the conventional neoclassical theory. This confirms the previous results [Phys. Rev. Lett. 63, 2369 (1989)]. It is also shown, by considering the effects of incompressible flow in the phase space described by the orbit-averaged Coulomb collision operator, that the ion orbit loss flux is intimately related to the plasma viscosity.

Original languageEnglish
Pages (from-to)171-175
Number of pages5
JournalPhysics of Fluids B
Volume4
Issue number1
DOIs
Publication statusPublished - 1992 Jan 1

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

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