GYRO: A 5-D Gyrokinetic-Maxwell Solver

ABSTRACT

GYRO solves the 5-dimensional gyrokinetic-Maxwell equations in shaped plasma geometry, using either a local (fluxtube) or global radial domain. It has been ported to a variety of modern MPP platforms including a number of commodity clusters, IBM SPs and the Cray X1. We have been able to quickly design and analyze new physics scenarios in record time using the Cray X1: (i) transport barrier studies (Phys. Plasmas 11 (2004) 1879), (ii) the local limit of global simulations (Phys. Plasmas 11 (2004) L25), (iii) kinetic electron and finite-beta generalizations of a community-wide benchmark case, and (iv) impurity transport with application to fuel separation in burning D-T plasmas (to be submitted to Nuclear Fusion). We report on recent physics progress and studies. Further, we discuss GYRO performance across several architectures.

REFERENCES

• 1: [1] Scientific Discovery through Advanced Computing. http://www.osti.gov/scidac/.
• 2: [2] J. Candy and R. Waltz. Anomalous transport in the DIII-D tokamak matched by supercomputer simulation. Phys. Rev. Lett., 91:045001-1, 2003.
• 3: J. Candy , R. E. Waltz, An Eulerian gyrokinetic-Maxwell solver, Journal of Computational Physics, v.186 n.2, p.545-581, 10 April 2003 [doi>10.1016/S00021-9991(03)00079-2]
• 4: [4] J. Candy, R. Waltz, and W. Dorland. The local limit of global gyrokinetic simulations. Phys. Plasmas, 11:L25, 2004.
• 5: [5] J. Candy, R. Waltz, and M. Rosenbluth. Smooothness of turbulent transport across a minimum- q surface. Phys. Plasmas, 11:1879, 2004.
• 6: [6] A. Dimits, G. Bateman, M. Beer, B. Cohen, W. Dorland, G. Hammett, C. Kim, J. Kinsey, M. Kotschenreuther, A. Kritz, L. Lao, J. Mandrekas, W. Nevins, S. Parker, A. Redd, D. Shumaker, R. Sydora, and J. Weiland. Comparisons and physics basis of tokamak transport models and turbulence simulations. Phys. Plasmas, 7:969, 2000.
• 7: [7] A. Dimits, T. Williams, J. Byers, and B. Cohen. Scalings of ion-temperature-gradient-driven anomalous transport in tokamaks. Phys. Rev. Lett., 77:71, 1996.
• 8: [8] W. Dorland, F. Jenko, M. Kotschenreuther, and B. Rogers. Electron temperature gradient turbulence. Phys. Rev. Lett., 85:5579, 2000.
• 9: [9] F. Jenko, W. Dorland, M. Kotschenreuther, and B. Rogers. Electron temperature gradient driven turbulence. Phys. Plasmas, 7:1904, 2000.
• 10: [10] Z. Lin, S. Ethier, T. Hahm, and W. Tang. Size scaling of turbulent transport in magnetically confined plasmas. Phys. Rev. Lett., 88:195004, 2002.
• 11: [11] Z. Lin and T. Hahm. Turbulence spreading and transport scaling in global gyrokinetic particle simulations. Phys. Plasmas, 11:1099, 2004.
• 12: [12] Z. Lin, T. Hahm, S. Ethier, W. Lee, J. Lewandowski, G. Rewoldt, W. Tang, W. Wang, L. Chen, and P. Diamond. Size scaling of turbulent transport in tokamak plasmas. In Plasma Physics and Controlled Nuclear Fusion Research (Proc. 19th International Conference on Fusion Energy, Lyon, 2002). IAEA, Vienna, 2003.
• 13: [13] R. Sydora, V. Decyk, and J. Dawson. Fluctuation-induced heat transport results from a large global 3d toroidal particle simulation model. Plasma Phys. Controlled Fusion, 38:A281, 1996.
• 14: [14] R. Waltz, J. Candy, and M. Rosenbluth. Gyrokinetic turbulence simulation of profile shear stabilization and broken gyrobohm scaling. Phys. Plasmas, 9:1938, 2002.

INDEX TERMS

Keywords:
Performance, Theory, GYRO, gyrokinetic, Eulerian, turbulence, parallel performance