Ion and electron temperature ratio and magnetic shear effects on electromagnetic instabilities
Recent advances in the development of a linear global eigen-value numerical code, called EM-GLOGYSTO, are presented. The present version includes a gyrokinetic model for ion dynamics and a drift-kinetic model for electron dynamics. Both passing and trapped particles are considered. An optimisation of the code running on parallel machines has been carried out with the aid of the MPI library, which allows for high portability and scalability. Thanks to this we have been able to conduct a deep analysis of the numerical convergence of the code. The implemented electromagnetic code has been applied to the study of ion temperature gradient (ITG) configurations and Alfvénic Ion Temperature Gradient (AITG) driven instabilities in tokamak. The effect of varying the electron to ion temperature ratio on these modes is investigated. The behaviour of an AITG mode for different electron temperature profile is shown. Finally, the evolution of the spectrum of these instabilities is studied for varying magnetic shear configurations.
Bibliographic Reference: A paper presented at the Joint Varenna-Lausanne International Workshop on "Theory of Fusion Plasmas", Varenna, Italy, August 27-30 2002, and published in EPFL Internal report 737/02, October 2002, pp.13-18.
Availability: Available free of charge from: École Polytechnique Fédérale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne Fax +41-21-6934747 Available online on the workshop website: http://varenna-lausanne.epfl.ch/
Record Number: 200215540 / Last updated on: 2002-11-20
Original language: en
Available languages: en