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Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

A Systematic Approach to the Linear-Stability Assessment of Alfvén Eigenmodes in the Presence of Fusion-Born Alpha Particles for ITER-like Equilibria

Oct 15, 2014, 8:30 AM
4h
Green 8-9 (Hotel Park Inn Pribaltiyskaya)

Green 8-9

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation
Poster Poster 3

Speaker

Dr Paulo Rodrigues (Instituto de Plasmas e Fusao Nuclear)

Description

A systematic approach to assess the linear stability of Alfvén eigenmodes in the presence of fusion-born alpha particles is described. Because experimental results for ITER are not available yet, there is no guidance about which Alfvén eigenmodes will interact more intensively with the fast-particle population. Therefore, the number of modes that need to be considered in stability assessments becomes quite large and care must be exercised when choosing the numeric tools to work with, which must be fast and efficient. In the presented approach, the eigenmodes are first found after an intensive scan of a suitable frequency range, performed within reasonable bounds for the toroidal and poloidal mode numbers. Each solution found is then tested to find if its discretization over the radial grid in use is adequate. Finally, the interaction between the identified eigenmodes and the alpha-particle population is evaluated with the drift-kinetic code CASTOR-K, in order to assess their growth rates and hence their linear stability. The described approach enables one to single out the most unstable eigenmodes in a given scenario, which can then be handled with more specialized tools. This ability eases the task of evaluating alpha-particle interactions with Alfvén eigenmodes, either for ITER scenarios or for any other scenario planning.
Paper Number TH/P3-25
Country or International Organisation Portugal

Primary author

Dr Paulo Rodrigues (Instituto de Plasmas e Fusao Nuclear)

Co-authors

Dr Antonio Figueiredo (Instituto de Plasmas e Fusao Nuclear) Dr Duarte Borba (Instituto de Plasmas e Fusao Nuclear) Dr Fernando Nabais (Instituto de Plasmas e Fusao Nuclear) Mr H. J. C. Oliver (HH Wills Physics Laboratory, Univ. of Bristol) Dr Jorge Ferreira (Instituto de Plasmas e Fusao Nuclear) Dr Nuno F. Loureiro (Instituto de Plasmas e Fusao Nuclear) Dr Rui Coelho (Instituto de Plasmas e Fusao Nuclear) Dr Sergei Sharapov (CCFE)

Presentation materials