Rotation dynamics and stability of collision edge layers in tokamak plasmas


Daybelge U., Yarim C., Nicolai A.

NUCLEAR FUSION, vol.44, no.9, pp.966-973, 2004 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 44 Issue: 9
  • Publication Date: 2004
  • Doi Number: 10.1088/0029-5515/44/9/004
  • Journal Name: NUCLEAR FUSION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.966-973
  • Istanbul Technical University Affiliated: No

Abstract

An earlier neoclassical transport theory for a collisional edge layer with steep radial gradients in the toroidal damping timescale is extended, to include also the faster poloidal damping timescale. In order to determine the stability behaviour of poloidal and toroidal rotations in a tokamak plasma, a two-timescale analysis is applied. It is observed that the poloidal and toroidal spin-up tendencies are strongly coupled by nonlocal interactions, although these evolve essentially on different timescales. Effects of charge exchange interactions, neutral beam injection, and a radial polarization current on both rotation speeds are consistently included in the model.