Parametric dependence of turbulent particle transport in high density electron heated FTU plasmas

Autor:	M Romanelli, G T Hoang, C Bourdelle, C Gormezano, E Giovannozzi, M Leigheb, M Marinucci, D Marocco, C Mazzotta, L Panaccione, V Pericoli, G Regnoli, O Tudisco, the FTU Team
Rok vydání:	2007
Předmět:	Electron density Tokamak Materials science Frascati Tokamak Upgrade Electron Plasma Collisionality Condensed Matter Physics law.invention Magnetic field Nuclear Energy and Engineering Physics::Plasma Physics law Electron temperature Atomic physics
Zdroj:	Plasma Physics and Controlled Fusion. 49:935-946
ISSN:	1361-6587 0741-3335
Popis:	In this paper we present the result of a study carried out at the Frascati Tokamak Upgrade (FTU), on a set of full non-inductive current driven, electron heated, L-mode discharges aimed at investigating the parametric dependence of the electron density profile on the electron temperature and safety factor gradients as predicted by quasi-linear drift-turbulence transport theory. Experiments in FTU allow the extension of similar studies carried out on other tokamaks to plasmas with higher density and higher magnetic field. Magnetic shear and electron temperature gradients are found to drive opposite turbulent particle flows in the gradient region (0.3 < r/a ? 0.5), while inward thermo-diffusion alone is found in the plasma core (r/a ? 0.3). Density profiles at midradius appear to be controlled by a convective term proportional to the density and independent of the gradient of temperature and magnetic shear. A linear increase in density peaking versus effective collisionality is found, differing from the scaling observed in other FTU plasma regimes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::83fa71925dda165467287c7f2c7cc30c https://doi.org/10.1088/0741-3335/49/6/016 Zobrazit plný text záznamu