Predictive integrated modelling for ITER scenarios
Integrated modelling of ITER scenarios, e.g. inductive H-modes, steady-state and hybrid scenarios, is essential for assessing their viability. Such modelling requires an accurate description of the relevant physics involved, in particular for the heat and particle transport. Different transport models are able to reproduce the existing experiments in various devices. However, they can yield significantly different results when extrapolated to ITER, either the global performance or the profiles of plasma parameters (for example pressure and current density). In this work, the uncertainty on the prediction of ITER scenarios is evaluated. For this purpose, we use two transport models, which have been extensively validated against the multi-machine database. The first model is GLF23. The second is a model in which the profile of diffusion coefficient is a gyroBohm-like analytical function, renormalized in order to get profiles consistent with a given global energy confinement scaling. This paper reports 1-D integrated simulations of full ITER discharges using the CRONOS code. The package of codes CRONOS includes modules for 2D MHD equilibrium, neoclassical transport (NClass) heat, currents and particle sources; and in particular a new orbit following Monte Carlo code dedicated to the simulation of fusion-born alpha particles. The CRONOS simulations give access to the dynamics of the discharge and allow for studies of the interplay of heat transport, current diffusion and sources. In addition, these results are cross with 0-D simulations. The main motivation of this work is to study the influence of parameters such plasma current, density peaking and non-inductively driven current on current diffusion and the central safety factor in ITER hybrid scenarios.
Bibliographic Reference: An oral paper given at: 32nd EPS Conference on Controlled Fusion and Plasma Physics Organised by: Asociación EURATOM-CIEMAT para Fusión Held at: Congress Palace of Tarragona, Tarragona (ES)
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, FranceL%Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: firstname.lastname@example.org
Record Number: 200518280 / Last updated on: 2005-07-26
Original language: en
Available languages: en