IMP12

Scientific Rationale and Main Objectives of the Task

The goal of the IMP12 activity is to provide the ITM-TF with a comprehensive set of equilibrium, linear stability, and non-linear MHD modelling tools as well as the tools for a consistent free boundary equilibrium evolution with application to the study of plasma disruptions. The project aims at providing ITER relevant modelling capabilities covering essential areas in an MHD simulation chain, starting from equilibrium reconstruction and free boundary evolution under feedback control via linear and non-linear MHD stability to non-linear MHD stability and plasma disruptions.

Scope and Long Term Perspective

The mature consolidation of a substantial part of the tools developped by IMP1 (equilibrium reconstruction and linear MHD stability) prompts for continued maintenance and integration.
Because of the synergy between equilibrium/linear stability and non-linear MHD modelling integration, IMP1 and IMP2 have been merged as off 2010.
Adopting a unifying strategy, the project therefore now consolidates the coverage of essential MHD numerical tools. Validation of the full chain of equilibrium reconstruction and linear stability codes has started in 2009 and will proceed in collaboration with the MHD Topical Group, addressing relevant experimental scenarios (disruptive limits, edge stability limits,...). Collaborations with additional experiments is planned.
Extension of the equilibrium and linear stability codes as well as the data structures to include plasma flow and 3D effects will consolidate the scope of the present tools.
Validation of the existing modules for modelling of a free boundary equilibrium on experiments and integration with the ETS , mediated by feedback control schemes, will enhance the whole device modelling capabilities of ITM tools.
Interfacing with non-linear stability modules dedicated to sawtooth, NTM, ELMs, error fields, and beta limit pertinent modules, such as the RWM will be facilitated.
Alongside such efforts, both 2D and 3D MHD non-linear stability modules will be integrated in the platform, with privileged application to further development for VDE/disruption capability, including work towards a "real time" disruption predictor for ideal MHD limits.