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Author(s): F. Salzedas
G. Ronchi
J. H. F. Severo
R. M. O. Galvão
E. K. Sanada
Title: Measurements of the natural plasma flow during the precursor of TCABR density limit disruptions
Issue Date: 2015
Abstract: Magnetic islands are known to degrade confinement of energy and particles in tokamak plasmas.They are also present in the precursor of density limit disruptions being observed untilthe onset of the energy quench of the disruption. The subject of the effect of plasma flow ontearing mode stability has been studied both theoretically [1] and experimentally [2]. Howeverthe experimental work has focused on plasmas with Neutral Beam Injection (NBI), which addshigh momentum to both the plasma and the island, deviating them from their natural velocities.It is important to know the plasma/island rotation behavior without NBI, not just to know theirnatural values but because future large tokamaks, like ITER, are expected to have low plasmarotation due to both large plasma inertia and low applied torque. In this work we will showexperimental values of the ion velocity and the magnetic island velocity measured in TCABRohmic plasmas, without NBI, and during the precursor of a density limit disruption. In this wayit was possible to compare the natural plasma velocity with the island velocity. The ion velocitywas inferred from Doppler spectroscopy of the impurity lines of CVI. Details of this diagnosticsystem and an error analysis of the measured signal can be found in [3]. With the present set up,the toroidal velocity can be measured with time resolution equivalent to 600 Hz and precisionsomewhat better than 5 km/s.
Subject: Física
Physical sciences
Scientific areas: Ciências exactas e naturais::Física
Natural sciences::Physical sciences
Source: 42nd European Physical Society Conference on Plasma Physics
Related Information: info:eu-repo/grantAgreement/Universidade do Porto/Acordo de Cooperação USP/U.Porto/USP/UP/2013/Estudo do Efeito da Rotação da Coluna de Plasma na Instabilidade Disruptiva em Tokamaks/USP/UP/2013
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: openAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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