Speaker
Description
A. Reyner-Viñolas1,2, J. Galdon-Quiroga1, J.M. Ordonez-Jimenez1, J. Gonzalez-Martin3, J. Rueda-Rueda4, Ye.O. Kazakov5, R. Ochoukov6, R. Bilato6, W. Suttrop6, S. Sipilä7, L. Sanchis1, the ASDEX Upgrade teama and the WPTE teamb
1. Department of Atomic, Molecular and Nuclear Physics, University of Seville, 41012 Seville, Spain
2. CNA (U. Sevilla, CSIC, J. de Andalucia), Sevilla, Spain
3. Department of Mechanical and Manufacturing Engineering, University of Seville. Seville, Spain
4. Department of Physics and Astronomy, University of California, Irvine, CA 92697, United States of America
5. Laboratory for Plasma Physics, LPP-ERM/KMS, EUROfusion Consortium member, TECPartner, Brussels, Belgium
6. Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany
7. Department of Applied Physics, Aalto University, PO Box 14100, 00076 AALTO, Finland
a) See author list of T. Pütterich et al, 2026 Nucl. Fusion 66 116002
b) See the author list of N. Vianello et al 2026 Nucl. Fusion 66 116010
The confinement of fast ions, generated by either the auxiliary heating systems or product of fusion reactions, is critical for future power plants, as they can severely damage plasma facing components and reduce performance. External magnetic perturbations (MPs), commonly used to control edge localized modes (ELMs) present in high confinement regimes, can either improve or degrade the overall fast-ion confinement depending on the applied MP spectrum. Previous works demonstrated that external magnetic perturbations (MPs), commonly used to control edge localized modes (ELMs) present in high confinement regimes, can either improve or degrade the overall NBI fast-ion confinement depending on the applied MP spectrum [1, 2]. In this contribution, we analyse the MP effects over NBI and ICRH fast-ion populations, which have higher energy and are more toroidally symmetric than NBI.
Experiments have been carried out in AUG, the only European tokamak equipped with both ICRH and MP capabilities. Two ICRH schemes are studied: 3rd harmonic D heating at Bt = 1.7 T, and minority-H heating at Bt = 2.5 T. In both cases > 3 MW of ICRH are applied, simultaneously to deuterium NBI and Electron Cyclotron Resonance Heating (ECRH). The main diagnostic employed in this work is the Fast Ion Loss Detector (FILD) [3], used to measure the fast-ion losses velocity-space evolution.
Simultaneous NBI and ICRH-induced losses have been observed in FILD. NBI losses originating from both the HFS and the LFS have been identified, corresponding to passing and trapped orbits respectively. The modulation of these losses corresponds to global rotation of the MPs. However, different regions of the velocity-space have a different phasing of the modulation. ICRH losses occur at higher energies (~100 keV) than NBI injection (60 keV). The modulation of the ICRH losses follows the change in the differential phasing of the MPs and it has a lower relative amplitude to the total signal measured. These results suggest that MPs can be used as actuators for phase-space engineering of higher-energy, toroidally symmetric fast-ion populations.
[1] L. Sanchis et al 2021 Nucl. Fusion 61 046006 (2021)
[2] J. Galdon-Quiroga et al 2022 Nucl. Fusion 62 096004 (2022)
[3] M. Garcia-Muñoz et al., Rev. Sci. Instrum. 80, 053503 (2009)