Physics of near-wall plasma in tokamaks

Abstract

The finite-size scaling of the free energy levels of Privman and Fisher is tested numerically on two-dimensional lattice strips in the king and q = 3 Potts universality. The universal amplitudes and the free energy per site are obtained. L Turban and J-M DebierreNightingale P and Blote H 1983 J. Phys. A: Math. Gen. 16 L657 Penson K A and Kolb M 1984 Phys. Rev. B 29 2854 Pichard J L and Sarma G 1981 J. Phys. C: Solid Stare Phys. 14 L617 Privman V and Fisher M E 1984 Phys. Rev. B 30 322 Syozi I 1972 Phase transitions andcriticalphenomena vol 1, ed C Domb and M S Green (New York: Academic) Wu F Y 1982 Rev. Mod. Phvs. 54 235 p 269

Magnetic and electrostatic structures measured in the edge region of the RFX-mod experiment

“…[22,23], following recent theories of blob formation [10,24] is suggested to arise as a response of plasma polarization induced by an effective gravity force, usually given by magnetic curvature effects; see also [25] for simulation of turbulence in linear devices. In order to ensure the plasma quasi-neutrality the parallel current is expected to be balanced by a transverse current J \ , through the relationship » Á J = 0.…”

Control of test particle transport in a turbulent electrostatic model of the Scrape-Off-Layer

“…Regimes with reduced parallel current are then very sensitive to charge separation via the curvature drift since the parallel current is less effective to balance the charge separation. In fact, the interchange instability, hence curvature charge separation combined to a density gradient, in conjunction with the sheath resistivity have been proposed to explain the very large fluctuation levels reported in the SOL [12,13]. We consider here this model of SOL turbulence in the limit T i ≪ T e .…”

Statistical analysis of turbulent front propagation in the scrape-off-layer

“…Control of this SOL turbulence with a biased ring is investigated in [6]. We address SOL transport with simulations of the SOL interchange instability [7,8]. We restrict the analysis to the density at constant temperature in the cold ion limit.…”