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Abstract

LHCD Statistical Modeling: Analysis of Tore Supra Data

K. Król¹, Y. Savoye-Peysson², J. Bielecki¹, D. Dworak¹, A. Jardin¹, D. Mazon², M. Scholz¹, J. Walkowiak¹

¹ Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
² CEA, IRFM F-13108 Saint Paul-lez-Durance, France

Lower Hybrid Current Drive (LHCD) is an efficient mechanism for driving non-inductively the toroidal current in a tokamak plasma, allowing steady-state fusion scenarios with an appropriate current density profile [1]. One of the most important devices contributing to the research on LHCD was the French tokamak Tore Supra (now refurbished as WEST) [2]. During the seminar, a statistical analysis of LHCD performance using experimental data from this machine will be discussed.

We will focus on applying the LUKE suite of codes to analyze current drive efficiency and LH wave absorption. The LUKE package includes the 3-D linearized bounce-averaged relativistic solver of the Fokker-Planck equation [3], coupled with the ray-tracing code C3PO [4], the antenna coupling code ALOHA [5], and the quantum relativistic fast electron bremsstrahlung code R5-X2 [6]. We will apply these tools to different plasma discharge scenarios involving two different LH antennas.

The study assesses the alignment of obtained results with experimental data in the context of different key parameters influencing LHCD in order to highlight possible areas for further improvement in LHCD research.

References:
[1] Fisch, N. J. (1987). Theory of current drive in plasmas. Reviews of Modern Physics, 59(1), 175.
[2] Equipe TORE SUPRA. (1995). Proceedings of the 15th Conference on Plasma Physics and Controlled Fusion (Seville, Spain). IAEA-CN-60/A1-5, p. 105.
[3] Peysson, Y., & Decker, J. (2014). Numerical simulations of the radio-frequency driven toroidal current in tokamaks. Fusion Science and Technology, 65(1), 22–42.
[4] Peysson, Y., & Decker, J. (2012). A versatile ray-tracing code for studying RF wave propagation in toroidal magnetized plasmas. Plasma Physics and Controlled Fusion, 54(4), 045003.
[5] Hillairet, J., Voyer, D., Ekedahl, A., Goniche, M., Kazda, M., Meneghini, O., Milanesio, D., & Preynas, M. (2010). ALOHA: An advanced lower hybrid antenna coupling code. Nuclear Fusion, 50(12), 125010.
[6] Peysson, Y., & Decker, J. (2008). Fast electron bremsstrahlung in axisymmetric magnetic configuration. Physics of Plasmas, 15(9), 092509.