Optimization of time-averaged power flux of RMP footprints in ITER

0484391 - ÚFP 2018 RIV US eng A - Abstract
Kripner, Lukáš - Loarte, A. - Cahyna, Pavel - Urban, Jakub - Peterka, Matěj - Evans, T. - Schmitz, O. - Pánek, Radomír
Optimization of time-averaged power flux of RMP footprints in ITER.
Bulletin of the American Physical Society. vol. 62, 12/2017. San Jose: American Physical Society, 2017. ISSN 0003-0503.
[APS: 59th Annual Meeting of the APS Division of Plasma Physics 2017. 23.10.2017-27.10.2017, Milwaukee, Wisconsin]
R&D Projects: GA ČR(CZ) GA16-24724S
Grant - others:GA MŠk(CZ) LM2015042
Institutional support: RVO:61389021
Keywords : RMP * ITER
OECD category: Fluids and plasma physics (including surface physics)
http://meetings.aps.org/link/BAPS.2017.DPP.PP11.71

Plasma-facing components (PFCs) in the ITER tokamak have engineering limits of the incident heat flux ( 10 MWm-2). These limits may be exceeded for example by Edge Localized Modes (ELMs) or by Resonant Magnetic Perturbations (RMPs). The time-averaged power flux can be reduced by a toroidal rotation of the ITER ELM coils (IECs) current waveform. However, such a rigid rotation results in large mechanical loads to IECs, which can significantly decrease their lifetime. We evaluate various options to decrease the required variations in the IECs currents while keeping the time-averaged power flux on the ITER divertor below the engineering limit. We use the Bayesian optimization algorithm to seek the optimum configuration. This method works efficiently even for a moderately large dimensionality, in our case up to several tens. For the analysis of a particular waveform we use the tangle distance method [Cahyna et al. Nucl. Fusion 2014], which is, due to its semi-analytical nature, fast enough to evaluate a wide range of options and plasma scenarios.
Permanent Link: http://hdl.handle.net/11104/0279738