Parallel filtering in global gyrokinetic simulations |
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| Authors: | S Jolliet BF McMillan L Villard T Vernay P Angelino TM Tran S Brunner A Bottino Y Idomura |
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| Institution: | 1. Japan Atomic Energy Agency, Higashi-Ueno 6-9-3, Taitou, Tokyo 110-0015, Japan;2. Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, PPB, 1015 Lausanne, Switzerland;3. Max Planck Institut fuer Plasmaphysik, IPP-EURATOM Association, Garching, Germany;1. CWI and Leiden University;2. CWI and Eindhoven University of Technology;3. University of Michigan;4. INRIA and Universit´e Nice Sophia Antipolis;5. Katholieke Universiteit Leuven;6. Los Alamos National Laboratory |
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| Abstract: | In this work, a Fourier solver B.F. McMillan, S. Jolliet, A. Bottino, P. Angelino, T.M. Tran, L. Villard, Comp. Phys. Commun. 181 (2010) 715] is implemented in the global Eulerian gyrokinetic code GT5D Y. Idomura, H. Urano, N. Aiba, S. Tokuda, Nucl. Fusion 49 (2009) 065029] and in the global Particle-In-Cell code ORB5 S. Jolliet, A. Bottino, P. Angelino, R. Hatzky, T.M. Tran, B.F. McMillan, O. Sauter, K. Appert, Y. Idomura, L. Villard, Comp. Phys. Commun. 177 (2007) 409] in order to reduce the memory of the matrix associated with the field equation. This scheme is verified with linear and nonlinear simulations of turbulence. It is demonstrated that the straight-field-line angle is the coordinate that optimizes the Fourier solver, that both linear and nonlinear turbulent states are unaffected by the parallel filtering, and that the k∥ spectrum is independent of plasma size at fixed normalized poloidal wave number. |
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