| Issue |
EPJ Web Conf.
Volume 313, 2024
22nd Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC22)
|
|
|---|---|---|
| Article Number | 01003 | |
| Number of page(s) | 6 | |
| Section | Theory and Design | |
| DOI | https://doi.org/10.1051/epjconf/202431301003 | |
| Published online | 15 November 2024 | |
https://doi.org/10.1051/epjconf/202431301003
Nonlinear Landau damping of electron Bernstein waves in MAST-U
1 Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3NP, United Kingdom
2 Culham Centre for Fusion Energy, UKAEA, Abingdon, OX14 3DB, United Kingdom
3 Department of Physics, Technical University of Denmark, Fysikvej, DK-2800 Kgs. Lyngby, Denmark
* e-mail: mads.senstius@physics.ox.ac.uk
Published online: 15 November 2024
The Mega-Amp Spherical Tokamak Upgrade (MAST-U) is preparing to investigate microwave based current drive using an advanced wave coupling scheme known as O-X-B at high power. The main goal is to assert if this is an efficient method for current drive in the future fusion demonstration power plant STEP. A model for the nonlinear wave-particle interaction nonlinear Landau damping (NLD) is presented. A relativistic, kinetic and electrostatic description is used. For MAST-U, NLD could lead to heating and current drive at the upper hybrid (UH) layer or at the electron cyclotron (EC) resonance of a substantially downshifted daughter wave produced by the wave-particle interactions. It is found that the typical treatment used for nonlinear waveinteractions fails at two critical points in the vicinity of the UH layer.
© The Authors, published by EDP Sciences, 2024
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