Impact of ICRF fast-ions on core turbulence and MHD activity in ASDEX upgrade

A. Bilato*, C. Angioni, A. Bañón Navarro, V. Bobkov, T. Bosman, A. Di Siena, E. Fable, R. Fischer, J. Galdon-Quiroga, T. Görler, J. Hidalgo-Salaverri, F. Jenko, T. Johnson, Ye O. Kazakov, O. Kudlacek, J. Manyer, M. Mantsinen, R. Ochoukov, E. Poli, J. Rueda-RuedaP. A. Schneider, S. Sipilä, W. Tierens, M. Usoltseva, M. Weiland, ASDEX Upgrade Team, EUROfusion MST1 Team

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

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Abstract

Experiments in various tokamaks and their analysis identify the fast ions (FI) generated by NBI and/or ICRF heating as one of the main causes of the observed improvement in core confinement: fast ions can reduce core microturbulence (mainly Ion-Temperature-Gradient (ITG) driven modes) either electrostatically or electromagnetically, or they can resonate with fishbones and high-frequency Alfvén modes, which in turn contribute in stabilizing ITG. In this perspective, we discuss recent experiments done on ASDEX Upgrade (AUG) where ICRF is the main actuator for FI generation for energies above 100 keV. Additionally, ICRF-FIs can substantially impact the MHD activity and its consequent effects on fast ion losses (FILs) and ion-cyclotron emission (ICE). We present dedicated AUG experiments with NBI-D further accelerated by ICRF.

Original languageEnglish
Article number030010
Pages (from-to)1-10
Number of pages10
JournalAIP Conference Proceedings
Volume2984
Issue number1
DOIs
Publication statusPublished - 18 Aug 2023
MoE publication typeA4 Conference publication
EventTopical Conference on Radio Frequency Power in Plasmas - Annapolis, United States
Duration: 26 Sept 202228 Sept 2022
Conference number: 24

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