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Hong, Suk-Ho,Grisolia, Christian,Monier-Garbet, Pascale Published jointly by The Institute of Physics and 2009 Plasma physics and controlled fusion Vol.51 No.7
<P>In-vessel dusts will be an important issue in next generation fusion devices. They affect not only plasma operations but also safety limits. A new image processing technique for in-vessel dust research is developed in Tore Supra (TS). This paper describes the image processing technique for in-vessel dust study based on simple standard image processing techniques. The technique is intended to use visible standard RGB CCD cameras at a standard frame rate already installed in TS. Studying the traces of straight line-like dust trajectories appearing in the CCD images during the plasma shots, the temporal evolution and the spatial locations of dust creation events (DCEs) can be monitored. Building a database of DCEs, information on the short/long term behavior of in-vessel dusts are obtained. Analyzing the database, statistics on DCEs can be found. Finally, DCEs during 22 ohmic discharges in 2006 CIMES campaign in TS are illustrated as an example.</P>
Shell models and the possibility of application to fusion plasmas
Gü,rcan, Ö,D,Hennequin, P,Vermare, L,Garbet, X,Diamond, P H Published jointly by The Institute of Physics and 2010 Plasma physics and controlled fusion Vol.52 No.4
<P>An extensive study of spectral shell models with possibilities for application to fusion plasmas is discussed. A set of shell models addressing various aspects of the characteristics of fusion plasmas have been derived. Difficulties associated with plasma medium, namely its intrinsic excitability, and importance of mescals have been discussed. The numerical implementation of shell models is discussed. It was observed that depending on the parameter regime, they may lead to steady state or display characteristics of predator–prey dynamics.</P>
Non-linear MHD modelling of edge localized modes dynamics in KSTAR
Bé,coulet, M.,Kim, M.,Yun, G.,Pamela, S.,Morales, J.,Garbet, X.,Huijsmans, G.T.A.,Passeron, C.,Fé,vrier, O.,Hoelzl, M.,Lessig, A.,Orain, F. IOP 2017 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.57 No.11
<P>The explanation of the existence of the rotating MHD modes in the pedestal region before Type I edge localized mode (ELM) crash and in the inter-ELM periods (ELM precursors) observed in KSTAR is provided for the first time in the present paper. The dynamics of ELMs, observed using electron cyclotron emission imaging (ECEI) in KSTAR tokamak, is compared to the modelling results of the non-linear reduced resistive MHD code JOREK. The realistic KSTAR pulse parameters and geometry including X-point and scrape off layer (SOL) were used. The full ELM crash modelling was performed using JOREK code for single and multi-harmonic representation and in multi-cycles ELMy regimes including relevant flows. The most unstable toroidal modes numbers (<I>n</I> = 5–8), velocity (~5 km s<SUP>−1</SUP> for <I>n</I> = 8 mode) and the direction of the mode rotation were reproduced in modelling. The two fluid diamagnetic effects and toroidal rotations included in the model were found to be the most important factors in explaining the experimentally observed rotation of the ballooning modes before the ELM crash and in the inter-ELM phase. In multi-harmonic multi-cycle simulations the spectrum of temperature fluctuations is similar to the experimental one in the inter-ELM phase, where several rotating modes with medium <I>n</I> numbers were detected in 5–30 kHz frequency range. The rotating modes can contain single or several harmonics which last from 0.2 ms to few ms in time, and can appear and disappear in the inter ELM period or persist until a new ELM crash.</P>
On the validity of the local diffusive paradigm in turbulent plasma transport.
Dif-Pradalier, G,Diamond, P H,Grandgirard, V,Sarazin, Y,Abiteboul, J,Garbet, X,Ghendrih, Ph,Strugarek, A,Ku, S,Chang, C S Published by the American Physical Society through 2010 Physical review. E, Statistical, nonlinear, and so Vol.82 No.2
<P>A systematic, constructive and self-consistent procedure to quantify nonlocal, nondiffusive action at a distance in plasma turbulence is exposed and applied to turbulent heat fluxes computed from the state-of-the-art full- f, flux-driven gyrokinetic GYSELA and XGC1 codes. A striking commonality is found: heat transport below a dynamically selected mesoscale has the structure of a Lévy distribution, is strongly nonlocal, nondiffusive, scale-free, and avalanche mediated; at larger scales, we report the observation of a self-organized flow structure which we call the ' E × B staircase' after its planetary analog.</P>