The code SPECE has been developed for the analysis of electron cyclotron emission (ECE) in a general tokamak equilibrium. The code solves the radiation transport equation along the ray trajectories in a tokamak plasma, in which magnetic equilibrium and plasma profiles are given either analytically or numerically, for a Maxwellian plasma or a non thermal plasma characterized by a distribution function that is the sum of drifting Maxwellian distributions. Ray trajectories are computed making use of the cold dispersion relation, while the absorption and emission coefficients are obtained solving the relevant fully relativistic dispersion relation valid at high electron temperature. The actual antenna pattern is simulated by means of a multi-rays calculation, and the spatial resolution of the ECE measurements is computed by means of an algorithm that takes properly into account the emission along each ray of the beam. Wall effects are introduced in the code by means of a heuristic model. Results of ECE simulations in a standard ITER scenario are presented.
SPECE : a code for Electron Ciclotron Emission in tokamaks / D. Farina, L. Figini, P. Platania, C. Sozzi - In: Burning Plasma Diagnostics : an International Conference : Varenna, Italy, 24-28 September 2007 / [a cura di] F.P. Orsitto, G. Gorini, E. Sindoni, M. Tardocchi. - [s.l] : Springer, 2008 Mar 12. - ISBN 978-0-7354-0507-3. - pp. 128-131 (( convegno Burning Plasma Diagnostics : an International Conference tenutosi a Varenna nel 2007 [10.1063/1.2905053].
SPECE : a code for Electron Ciclotron Emission in tokamaks
L. FiginiSecondo
;
2008
Abstract
The code SPECE has been developed for the analysis of electron cyclotron emission (ECE) in a general tokamak equilibrium. The code solves the radiation transport equation along the ray trajectories in a tokamak plasma, in which magnetic equilibrium and plasma profiles are given either analytically or numerically, for a Maxwellian plasma or a non thermal plasma characterized by a distribution function that is the sum of drifting Maxwellian distributions. Ray trajectories are computed making use of the cold dispersion relation, while the absorption and emission coefficients are obtained solving the relevant fully relativistic dispersion relation valid at high electron temperature. The actual antenna pattern is simulated by means of a multi-rays calculation, and the spatial resolution of the ECE measurements is computed by means of an algorithm that takes properly into account the emission along each ray of the beam. Wall effects are introduced in the code by means of a heuristic model. Results of ECE simulations in a standard ITER scenario are presented.
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