Effect of Resistivity on Tokamak Eigenmodes |
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Principal InvestigatorRobin StorerDepartment of Physics, Flinders University |
The aim of the project was to develop and use computational techniques
to study the For helical plasmas, the effects of resistivity on the magnetohydrodynamics of the plasma has only just started to be investigated. Some of the techniques that I have developed for axi-symmetric plasmas may be able to be applied to large aspect ratio helical plasmas, of the type found in stellarators and heliacs. This will indicate if a fully three-dimensional approach is warranted. |
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Projectse80 - VPP |
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What are the results to date and the future of the work?In a major recent modification to SPECTOR^{ }provision has been made to determine the response of the plasma to an externally applied field. Comparisons have been made between the response as a function of frequency and poloidal structure and the complex spectral pattern. This is not as straightforward as it may seem as the density of spectral points is very large (proportional to the square root of the resistivity) and the response receives contributions from a large number of eigenmodes. |
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- Appendix B |
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What computational techniques are used?The code uses the inverse iteration procedure to calculate the eigenvalues of a large block-tri-diagonal matrix of order about 20,000 with block matrix sizes of about 100x100. Most of the vectorization will be in the core of the program where the most time is spent inverting matrices. There are packages available for that which are vectorised. PublicationsR. G. Storer, Computational Magnetohydrodynamics, in Computational Physics, H. Gardner and C. Savage (Eds), World Scientific Pub. pp81-116 (1997). R. G. Storer, Toroidal Effects on the Resistive Magnetohydrodynamic Spectrum, in Theory of Fusion Plasmas, Ed by J. W. Connor, E. Sindoni and J. Vaclavick; Edittrice Compositori (Bologna) pp 363-368 (1997). S. Sen, R. G. Storer, , Theory of drift waves in the presence of parallel and perpendicular flow curvature II Toroidal model , Physics of Plasmas 4, 3113 (1997). S. Sen, R. G. Storer, Suppression of Rayleigh-Taylor Instability by Flow Curvature , Physics of Plasmas 4, 3731 (1997). R. G. Storer, Resistive MHD Spectra, Journal of the Korean Physical Society, 31, S177 (1997) R. G. Storer, MHD Response of a Toroidal Resistive Plasma to External Driving Fields, Proc 21st AINSE Plasma Science and Technology Conference, Lucas Heights, NSW (Feb, 1997). |
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Appendix B - |
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