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Seppo Sipilä (Aalto University)28/09/2026, 14:20Poster session IPoster
The Monte Carlo orbit-following code ASCOT /1/ is a widely used tool for simulating fast ion minority populations in toroidal devices, featuring source modules for fusion products (AFSI) and neutral beam injection (BBNBI) as well as modelling of ion cyclotron resonance heating (RFOF). In addition to its capability to simulate the formation of hot ion tail distributions from various sources in...
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Eamon Hartigan-O'Connor (Princeton University)28/09/2026, 14:20Poster session IPoster
Instabilities driven by energetic particles are central to the physics of a burning plasma. The majority of kinetic simulations and reduced models assume that the unstable distribution is already fully established when energetic-particle-driven modes grow unstable. In realistic scenarios, however, energetic particles may accumulate in the resonance on an effective timescale comparable to the...
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Alex Reyner Viñolas (University of Seville)28/09/2026, 14:20Poster session IPoster
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
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1. Department of Atomic, Molecular and Nuclear Physics, University of Seville, 41012 Seville, Spain
2. CNA (U. Sevilla, CSIC, J. de Andalucia), Sevilla,... -
Baruch Rofman (EPFL - SPC)28/09/2026, 14:20Poster session IPoster
Burning plasma is computationally challenging to simulate due to the multi-scale interactions between energetic particles (EPs), Alfvén eigenmodes, and microinstabilities that drive turbulence. Many studies circumvent this difficulty by focusing on a single instability and making the corresponding simplifying assumptions. However, these approximations do not necessarily preserve the global...
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Mervi Mantsinen (Barcelona Supercomputing Center (EU))28/09/2026, 14:20Poster session IPoster
Energetic-particle observations of second harmonic tritium heating in JET DTE3 and comparison with H-minority heating
M.J. Mantsinen $^{1,2}$, P. Jacquet$^{3}$, D. Gallart$^{1}$, K. Kirov$^{3}$, E. Lerche$^{3,4}$, D. Taylor$^{3}$, C.D. Challis$^{3}$, E. Delabie$^{5}$, A. Kappatou$^{6}$, D. Keeling$^{3}$, D. King$^{3}$, V. Kiptily$^{3}$, M. Nocente$^{7,8}$, E. Parr$^{3}$, S....
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Feng Wang DLUT (Dalian University of Technology (CN))28/09/2026, 14:20Poster session IPoster
Fast-ion transport in EAST plasmas is studied using a particle-tracing method for two cases: edge-localized-mode (ELM) electromagnetic perturbations alone and coexisting ELM and tearing-mode (TM) perturbations. The ELM perturbations are obtained from nonlinear BOUT++ simulations first and then mapped onto the triangular equilibrium mesh used in the Particle orbit Tracing Code (PTC). When ELM...
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Erik K. Eidsvig (IPP - Max-Planck-Institut für Plasmaphysik (EU))28/09/2026, 14:20Poster session IPoster
For operation of future tokamak scenarios, a high pressure gradient favours the bootstrap mechanism, but also makes the plasma prone to MHD instabilities [1]. One of these instabilities is the fishbone instability, which is a 𝑚=𝑛=1 internal kink mode driven unstable by energetic particles [2]. It has been reported by both experimental and
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numerical studies that the fishbone instability is not... -
Dr Hanzheng Li (National Institute for Fusion Science)28/09/2026, 14:20Poster session IPoster
We develop a full-orbit delta-f energetic-particle model in the hybrid kinetic-MHD code MEGA and apply it to nonlinear simulations of a beam-driven, sub-cyclotron global Alfven eigenmode (GAE) in a low-field DIII-D plasma. The equilibrium and beam parameters are based on the NSTX-similarity DIII-D discharge reported by Heidbrink et al. (Nucl. Fusion 46, 324, 2006), for which the observed...
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Runzhe Zhang (University of Science and Technology of China)28/09/2026, 14:20Poster session IPoster
Synergistic heating using Ion Cyclotron Range of Frequencies (ICRF) waves and Neutral Beam Injection (NBI) can produce fast ions (FIs) with energies significantly higher than those of the beam ions. The effects of NBI-ICRF synergy (NIS) FIs on NBI-fast-ion-driven fishbone instabilities are investigated using the M3D-K code. The FIs distribution function contains a slowing-down distribution and...
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Otso Hyvärinen (University of Helsinki)28/09/2026, 14:20Poster session IPoster
Achieving burning fusion plasmas relies on the confinement of energetic fast ions, yet this remains challenging due to the gaps in our understanding of the fast-ion distribution function. However, the reconstruction of high-dimensional fast-ion distribution function is a severely ill-posed inverse problem. As a result, to find physically meaningful solutions, the experimental data must be...
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Xiangfeng Wu (Dalian University of Technology)28/09/2026, 14:20Poster session IPoster
The synergy between neutral beam injection (NBI) and ion cyclotron range of frequencies (ICRF) heating provides an effective route for tailoring fast-ion distribution functions and enhancing non-thermal fusion reactivity in tokamak plasmas. In this work, NBI–ICRF synergistic fast-ion physics in an EAST plasma scenario is investigated using complementary TRANSP and PTC simulations. NBI-only and...
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Yufan Qu (Southewestern Institute of Physics)28/09/2026, 14:20Poster session IPoster
We report the analogous experimental observation of the nonlinear mode coupling preceding sawtooth crashes on HL-2A and HL-3 tokamaks. In this experiment, nonlinear mode coupling between m/n = 1/1 internal kink mode (where m and n are poloidal and toroidal mode number respectively) and energetic particle modes (EPMs) is conclusively identified by MEGA analysis, and the mode coupling is...
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Ken McClements (UKAEA)28/09/2026, 14:20Poster
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Ningfei Chen (Max-Planck Institute for Plasma Physics)28/09/2026, 14:20Poster session IPoster
The confinement and slowing-down of energetic particles (EPs) generated by fusion reaction and/or neutral beam injection (NBI) are essential topics in achieving self-sustained burning plasma [1]. Alfvén instabilities, which can be driven unstable by EPs [2], can induce significant EPs transport [3], among which the toroidal Alfvén eigenmode (TAE) is an important component due to its minimal...
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Daniil Kabirov (Dpto. de Física Atómica, Molecular y Nuclear, Universidad de Sevilla; Centro Nacional de Aceleradores (Universidad de Sevilla, Junta de Andalucía, CSIC))28/09/2026, 14:20Poster session IPoster
In magnetically confined fusion devices, energetic particles produced by external heating systems such as neutral beam injectors (NBI) or ion cyclotron resonance heating (ICRH) may excite MHD instabilities such as Alfven Eigenmodes (AEs) which can degrade confinement in tokamak plasmas and potentially damage the plasma facing components [1]. Externally applied 3D Magnetic Perturbations (MPs)...
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xiaoxi zhang28/09/2026, 14:20Poster session IPoster
The interaction between fusion-born alpha particles and resistive MHD modes is a key stability concern for burning plasmas such as ITER. The neoclassical tearing mode — one of the most performance-limiting instabilities in these regimes — is itself driven by the helical perturbation of the bootstrap current associated with pressure flattening inside magnetic islands, which makes the perturbed...
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Tommaso Barberis (Princeton Plasma Physics Laboratory)28/09/2026, 14:20Poster session IPoster
We present a reduced framework to describe the multiscale interaction between thermal plasma microturbulence, energetic particles generated by auxiliary heating, and the macroscopic instabilities that these particles can drive. Our approach focuses on how microturbulence regulates the saturation amplitude of energetic-particle-driven modes, such as shear Alfvén waves, through...
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Weixin Guo (Huazhong University of Science and Technology)28/09/2026, 14:20Poster session IPoster
Future D–T burning plasmas generate energetic alpha particles that gradually evolve into thermalized helium ash. The resulting helium ions modify turbulence through dilution effects, while turbulence simultaneously regulates helium-ion transport. Understanding this mutual interaction is essential for predicting both confinement performance and helium-ash exhaust in future fusion reactors.
A...
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Dr Hao Wang (National Institute for Fusion Science)28/09/2026, 14:20Poster session IPoster
Energetic particles (EPs) include fusion alpha particles and the fast ions from auxiliary heating. These particles can drive instabilities in a toroidal plasma. The instabilities then push the EPs outward. This lowers the heating efficiency and raises the heat load on the first wall.
These instabilities are studied with the MEGA code. MEGA is a hybrid code: the bulk plasma is a nonlinear...
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Huishan Cai (University of Science and Technology of China (CN))28/09/2026, 14:20Poster session IPoster
Energetic particles (EPs) are essential for sustaining burning plasmas through self-heating, but they can also drive global instabilities that degrade EP confinement, making quantitative prediction of EP transport crucial for achieving high fusion performance. Among these instabilities, fishbone modes are particularly important because their macroscopic mode structures can induce significant...
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