Hannover 2020 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 4: Helmholtz Graduate School 1 and Magnetic confinement 1

P 4.5: Vortrag

Montag, 9. März 2020, 15:45–16:00, b305

Control of neoclassical tearing modes in fusion reactors — •Raphael Schramm¹, Ondrej Kudlacek¹, Hartmut Zohm¹, Emiliano Fable¹, Filip Janky¹, Olivier Sauter², Mattia Siccinio^1,3, Wolfgang Treuterer¹, and Emanuele Poli¹ — ¹Max-Planck-Institut für Plasmaphysik(IPP), D-85748 Garching b. München, Germany — ²École Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland — ³EUROfusion Consortium, PPP&T department, Boltzmannstr. 2, Garching

Neoclassical tearing modes (NTMs) are magneto-hydrodynamic instabilities in tokamak plasmas, that can cause a degradation of plasma confinement and eventually trigger a disruption. Since both of these are critical issues for a future tokamak reactor, NTM control is essential. This work presents a closed loop control simulation with realistic diagnostics and actuators, based on the tokamak plasma model implemented in ASTRA. The NTM amplitude evolution is based on the modified Rutherford equation and was benchmarked against an independent analytical estimate. The control action is executed by directing an electron-cyclotron (EC) beam, which drives a current in the island. The proper injection angles to hit the island are found by monitoring the NTM amplitude, while sweeping the beam around the estimated island position. Based on this work, first power estimates for the stabilization of the 2/1 NTM mode in EU-DEMO will be provided. This contribution will also deal with mode locking and study the effects of the EC beam broadening due to density fluctuations.