Effects of orbit squeezing on ion transport in the banana regime in tokamaks

K. C. Shaing, R. D. Hazeltine

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70 Citations (Scopus)

Abstract

It is shown that ion transport in the banana regime in tokamaks is reduced in the presence of a strong shear in the radial electric field Er, as is often observed in the edge region. For simplicity, the ordering with ρpi|d ln Er/dr| ≫ 1 but c|Er|/B pυti < 1 is adopted. Here, ρpi is the ion poloidal gyroradius, Bp is the poloidal magnetic field strength, υti is the ion thermal speed, and c is the speed of light. A kinetic transport theory similar to those for bumpy tori and stellarators is developed to show that the ion thermal conductivity χi is reduced by a factor of roughly S-3/2, where S = 1 - (ρpid ln Er/dr) (cEr/B pυti). The result reflects more than simple orbit squeezing: The fraction of trapped ions is also modified by S.

Original languageEnglish
Pages (from-to)2547-2551
Number of pages5
JournalPhysics of Fluids B
Volume4
Issue number8
DOIs
Publication statusPublished - 1992

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • General Physics and Astronomy
  • Fluid Flow and Transfer Processes

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