Abstract
The possibility of driving a large fraction of the plasma current in a tokamak reactor employing electron cyclotron waves is investigated for scenarios as envisaged in the European DEMO through beam tracing calculations performed with the TORBEAM code, which assumes a linear regime for power absorption and employs an adjoint method for the determination of the driven current. Comparatively high ECCD efficiency in the inner half of the plasma column can be achieved by injecting the wave from an elevated position. On the other hand, the efficiency deteriorates in the colder, outer part of the plasma, so that a prohibitive amount of power would be needed to sustain the plasma current non-inductively by ECCD only in the considered scenarios. As an alternative scheme, the injection of slow extraordinary wave below the fundamental resonance is considered. The basic physics features of this scenario are discussed.
| Original language | English |
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| Number of pages | 6 |
| Journal | EPJ Web of Conferences |
| Volume | 313 |
| DOIs | |
| Publication status | Published - 15 Nov 2024 |
| MoE publication type | A4 Article in a conference publication |
| Event | 22nd Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2024 - Daejeon, Korea, Republic of Duration: 22 Apr 2024 → 26 Apr 2024 |
Funding
This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 \u2014 EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.