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Experiments on electron temperature profile resilience in FTU tokamak with continuous and modulated ECRH (Contributo in atti di convegno)

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Experiments on electron temperature profile resilience in FTU tokamak with continuous and modulated ECRH (Contributo in atti di convegno) (literal)

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Cirant S. 1, Bruschi A. 1, De Benedetti M., De Luca F. 1, Esposito B., Gandini F. 1, Granucci G. 1, Jacchia A.1, Lazzaro E. 1, Minardi E. 1, Nowak S. 1, Sozzi C. 1, Tudisco O. 2, ECRH Group and FTU Team (2003)
Experiments on electron temperature profile resilience in FTU tokamak with continuous and modulated ECRH
in 19th IAEA Fusion Energy Conference, Lyon, France, 14-19 Ottobre 2002
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Cirant S. 1, Bruschi A. 1, De Benedetti M., De Luca F. 1, Esposito B., Gandini F. 1, Granucci G. 1, Jacchia A.1, Lazzaro E. 1, Minardi E. 1, Nowak S. 1, Sozzi C. 1, Tudisco O. 2, ECRH Group and FTU Team (literal)

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Presentazione alla conferenza internazionale organizzata dall'IAEA di Vienna (literal)

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Lavoro sperimentale ed interpretativo sul problema fondamentale della diffusione termica nei plasma tokamak. (literal)

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1) Istituto di Fisica del Plasma - CNR, Milano, Italy 2) Centro Ricerche Energia, Associazione EURATOM/ENEA/CNR sulla Fusione, Frascati, Rome, Italy 3) I.N.F.M. and Dipartimento di Fisica, Università degli Studi di Milano, Milano Italy (literal)

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Experiments on electron temperature profile resilience in FTU tokamak with continuous and modulated ECRH (literal)

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Abstract

Experiments performed on FTU tokamak, aiming at validation of physics-based transport models of the electron temperature profile resilience, are presented. ECRH is used to probe transport features, both in steady-state and in response to perturbations, while ECCD and LHCD are used for current density profile shaping. Observed confinement behaviour shows agreement with a critical temperature gradient length modelling. Central, low gradient plasma is characterized by low stiffness and low electron thermal diffusivity. Strong stiffness and high conduction are found in the confinement region. Resilience is experimentally characterized by an index of the resistance of the profile to adapt its shape to localized ECRH, while the diffusivity and its low-high transition are measured both by power balance and heat pulse propagation analysis. A particular attention is given to the investigation of the transition layer between low-high diffusivity and low-high stiffness regions. A dependence of LTc on magnetic shear, similar to what found in Tore Supra, and consistent with ETG based anomalous transport, is found. (literal)

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