Introduction

 

The Integrated Tokamak Modeling Task Force (ITM-TF) has the long-term aim to provide the EU with a suite of codes necessary for preparing and analyzing future ITER discharges, with the highest degree of flexibility, confidence and reliability. To reach such a goal, four initial topical areas have been identified, which have formed the structure of the ITM-TF: Identification of Codes & Models, Interfacing Procedure and Numerical Support, Code Validation and Benchmarking,  ITER Integrated Scenario Activity.

 An initial census of the existing codes and models  has been carried out and is available in the Expert area accessible to all registered members of the task force. This concerns a priori all the domains of the Modeling Activity. It is very important to note that although the primary goal of the ITM-TF is ITER integrated scenario activity, Stellarator and RFP groups are encouraged to participate. The aim of the census  is to give a clear and realistic assessment of the present situation; provide a first list of codes and models (with documentation), and point out to Research Units the areas where no modules are available or where a need for further development exists.

 Detailed procedures and common interfacing packages, enabling cross-coupling between codes and databases are the responsibility of the two topic groups DCP (Data Coordination Project) and CPP (Code Platform Project). Detailed information on those two projects, participants and news are available in the Expert area of this web site. A key goal of the two projects is to converge to an internationally accepted standard for the interfacing of code modules and access to experimental data. The groups must also explore the possibility to provide a high level expertise in the domain of numeric optimization when necessary. A systematic handling of code versions must be rapidly put in place.

Five Integrated Modeling Projects (IMP) have been started covering: equilibrium and MHD  (IMP#1), non linear MHD, sawtooth and ELMs (IMP#2), energy and particle transport (IMP#3), first principle transport and turbulence (IMP#4) and fast particles and heating (IMP#5). Project leaders and participants from the associations have been identified. Detailed information on those projects, participants and news are available in the Expert area of this web site. The groups will also provide a detailed procedure for benchmarking and validating codes and models. This will involve close comparisons with experimental data.

 Once the integrated codes will be available the TF-ITM will undertake a comprehensive assessment of the integrated ITER scenarios, relying on the tools validated by the ITM-TF, and supporting the development of ITER-relevant scenarios in current experiments.