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The influence of Polarization Currents on the Edge Plasma Turbulence in Tokamaks
Author(s) -
Nedospasov A. V.,
Uzdensky D. A.
Publication year - 1994
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150340229
Subject(s) - tokamak , limiter , physics , dissipation , turbulence , instability , plasma , polarization (electrochemistry) , magnetic field , mechanics , two stream instability , magnetohydrodynamics , computational physics , atomic physics , nuclear physics , thermodynamics , telecommunications , chemistry , quantum mechanics , computer science
The nature of edge turbulence in tokamaks and stellarators is associated in literature with the dissipation by currents, flowing through the potential sheath near the surface (SD ‐ surface dissipation). There are two mechanisms for the instability: the flute instability due to the fluctuations of the Pfirsch‐Schlüter currents [1], and an instability due to the fluctuations of polarization currents [2], the latter mechanism taking place only when ▽ T e ≠ 0. So far these two mechanisms were considered separately. In the present work the stability of plasma in the scrape‐off‐layer (SOL) of tokamak with a ring poloidal limiter is studied in linear approximation. Both magnetic field toroidicity effects and polarization current fluctuations are taken into account.