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Andrea Valentini (University of Milano Bicocca)29/09/2026, 14:15Poster session IPoster
In this work, we show an alternative approach for calculating energy spectra of particles generated via fast ions in magnetized plasmas reacting with a finite temperature bulk. While numerical methods account for all degrees of freedom involved, recently developed analytical methods [1-3] disregard the temperature of the bulk plasma in favor of faster calculations. Here, we still make use of...
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100. Consistent workflow for evaluating beam-target fusion rate with the orbit-following code ASCOT5Joona Sissonen29/09/2026, 14:15Poster session IPoster
Volumetric neutron sources (VNS) are being developed to produce 14 MeV DT neutrons for fusion materials testing. To limit the size and cost of such VNS, beam-driven systems utilising beam-target fusion reactions are widely studied [1]. Accurate prediction of the beam-target fusion rate is therefore essential for VNS design. Beam-target fusion rates are typically evaluated by first calculating...
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Avigdor Veksler (Columbia University)29/09/2026, 14:15Poster session IPoster
Understanding the interactions between the energetic particle (EP) distribution function with waves is critical for burning plasma operation in future reactor-scale stellarators. We develop a quasilinear theory for nonlinear alpha particle-AE interactions in stellarators, building on a resonance-broadened quasilinear model for tokamaks [1] in action-angle coordinates. Action-angle coordinates...
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Dr Guanming YANG (Southwestern Institute of Physics, Chengdu, China)29/09/2026, 14:15Poster session IPoster
ITER plans to conduct the D-T fusion experiment in 2039. Effects of the resistive internal kink mode (IK) and fishbone instabilities on the redistribution and the transport coefficients of alpha particles in ITER 15 MA baseline scenario are numerically investigated using the particle tracing code PTC. The results of scanning the perturbation amplitude shows that the IK can result in alphas...
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Jacobo Varela Rodriguez (Institute for Fusion Studies UT-austin)29/09/2026, 14:15Poster
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Elizabeth Paul (Columbia University)29/09/2026, 14:15Poster session IPoster
FIRM3D is an open-source Python/C++/CUDA software suite for modeling energetic particle dynamics in 3D magnetic fields. The core guiding-center integration routines grew out of SIMSOPT (Landreman et al., 2021), but have been extended to include additional physics and diagnostics not typically required in the stellarator optimization context. This standalone framework enables focused...
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Andreas Bierwage (QST)29/09/2026, 14:15Poster session IPoster
Computationally inexpensive integrated codes simulating interactions between Alfvén waves and fast ions in tokamak plasmas make use of perturbative models for the intermediate and slow processes of instability growth, saturation, chirping and busting, and associated fast ion transport. Meanwhile, the processes by which an Alfvén mode's spatiotemporal structure forms are assumed to have been...
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Cosmo Gallaro29/09/2026, 14:15Poster session IPoster
Gyrokinetic Simulations for Spherical Tokamak Energetic Particle-Turbulence Experiments
C. Gallaro¹†, T. Barberis¹, T. Adkins¹, P. J. Bonofiglo¹, and V. N. Duarte¹
¹Princeton Plasma Physics Laboratory, Princeton, New Jersey, USA
†cgallaro@pppl.govRecent experiments on the MAST-U spherical tokamak investigated the multi-scale coupling between energetic particles, Alfvénic eigenmodes...
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Olivier Panico (Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), Lausanne)29/09/2026, 14:15Poster session IPoster
Electromagnetic modes are routinely observed in tokamaks during runaway electron (RE) experiments [1-3]. These modes lie in both the Alfvénic and the lower hybrid frequency ranges. Theory and recent experiments suggest that such modes can enhance the pitch-angle scattering of REs [4], help reduce their maximum energy [5] and enhance their radial transport.
These modes therefore play a dual...
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Prof. Gyungjin Choi29/09/2026, 14:15Poster session IPoster
The rigorous evaluation of magnetically trapped particle dynamics in 3D perturbed magnetic fields in toroidal magnetized plasmas remains a fundamental theoretical challenge. Standard bounce-averaging methods are often too rough or produce artificial singularities near the turning points due to the distortion of magnetic surfaces. This mathematical difficulty becomes a crucial physical issue...
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Dr Jose Rueda Rueda (Postdoctoral Researcher)29/09/2026, 14:15Poster session IPoster
Resonant energy exchange between waves and particles is a fundamental concept in plasma physics. It was previously measured in satellite and basic laboratory experiments but has never been measured in the core of a magnetic fusion device. Now, however, thanks to DIII-D’s diagnostic suite, resonant energy exchange between energetic particles and Alfvén waves has been measured. This work...
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Amelia Chambliss29/09/2026, 14:15Poster session IPoster
The impact of $\alpha$ heating on collisional transport of thermal species and the influence of Alfv\'en waves on fast ion transport are crucial mechanisms driving reactor-scale physics, though both remain important open questions for stellarator fusion power plants (FPPs). To better understand the latter, we compute the linear growth rates of Alfv\'en eigenmodes (AEs) in a reactor scale...
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Dr Panith Adulsiriswad (adulsiriswad.panith@qst.go.jp)29/09/2026, 14:15
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Deyong Liu (General Atomics)29/09/2026, 14:15Physics of energetic particle modes and transport IVOral
Sawtooth oscillations and the associated fast ion transport play a critical role in plasma stability, heating efficiency, and fusion performance. Despite general similarities, sawteeth show a broad variance in characteristics, such as sawtooth crash time, amplitude, and period, depending on the safety factor q, plasma current, plasma beta, plasma shape, and collisionality. The improved...
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DEBABRATA BANERJEE (POLITECNICO DI TORINO)29/09/2026, 14:15Poster session IPoster
Axisymmetric modes (toroidal mode n=0) have been observed in recent experiments on TCV with both co-current and counter-current directions injection of neutral beam [1]. These energetic particle driven global modes, prominently the GAE (Global Alfven Eigenmode), and the VDOM (Vertical Displacement Oscillatory Modes) [2], could potentially be driven by fusion alpha particles in future fusion...
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Dr Haider Rizvi (Korea Institute of Fusion Energy)29/09/2026, 14:15Poster session IPoster
Most nonlinear simulations of Alfvén Eigenmode (AE) stability study one toroidal mode family at a time, yet in a real tokamak discharge several toroidal mode numbers $n$ are unstable simultaneously. When these families coexist, they compete for the same free energy, couple through three-wave interactions, and collectively drive zonal flows, none of which a single-$n$ model can describe. To...
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Simone Cavallero (Polytechnic of Turin, Princeton University)29/09/2026, 14:15Poster session IPoster
Axisymmetric (n=0) perturbations in magnetically confined plasmas include distinct global oscillatory modes occurring in the Alfvénic frequency range, such as Global Alfvén Eigenmodes and Vertical Displacement Oscillatory Modes, both of which can couple resonantly to energetic particles and undergo nonlinear saturation in the presence of fast-ion drive. This is particularly relevant in NBI or...
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Lars-Göran Eriksson (Chalmers University of Technology, Gothenburg, Sweden)29/09/2026, 14:15Poster session IPoster
There is evidence that axisymmetric modes can be driven by alpha particles in tokamaks [H. J. C. Oliver, Phys. Rev. Lett. \textbf{136}, 055101 (2026)]. It is therefore of interest to investigate the main mechanism behind the drive of the modes. When the distribution function of the non-thermal ions, $f_h$, is given as a function of the invariants of the unperturbed motion energy ...
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Dmitry Moseev (IPP Greifswald)29/09/2026, 14:15Poster session IPoster
Due to the 3D geometry, the toroidal canonical momentum is not an adiabatic invariant in stellarators. Typically, this leads to higher losses of fast ions in comparison with tokamaks. Wendelstein 7-X, an optimized stellarator, is predicted to have improved confinement of isotropically distributed fast ions in equilibria with high beta. Whether this property of the optimized equilibrium can be...
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Mr Seongbin Hong (POSTECH)29/09/2026, 14:15
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Thomas Hayward-Schneider (Max Planck Institute for Plasma Physics, Garching)29/09/2026, 14:15Poster session IPoster
We present recent progress of applying global electromagnetic gyrokinetics (GK) to future fusion devices. Results shown from the global GK particle-in-cell (PIC) code ORB5 [E. Lanti et al., CPC, 2020] include simulations of the EUROfusion Volumetric Neutron Source (VNS) [see also Ph. Lauber, this conference], for which simulations of Alfvén eigenmodes have been performed as well as for...
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Dr Pavel Aleynikov (Max-Planck-Institut für Plasmaphysik)29/09/2026, 14:15Poster session IPoster
Stellarators are among the leading concepts for future fusion reactors, with a key advantage over tokamaks being their practical immunity to large-scale disruptions. The work [1] shows that a rapid shutdown of stellarator coil currents - leading to fast dissipation of poloidal magnetic flux - can nonetheless generate a strong toroidal electric field and drive a runaway-electron avalanche, even...
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Arkaprava Bokshi (UKAEA)29/09/2026, 14:15Poster session IPoster
Transport of alpha-particles born in deuterium-tritium (D-T) nuclear fusion reactions is a key issue for magnetic fusion. Wave-particle resonant interactions – between Alfvén waves and alpha-particles born at super-Alfvénic energy – could induce significant radial re-distribution of alpha-particles, affecting both the self-heating efficiency and integrity of the first wall [1].
The effect...
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Abdullah Hyder (Columbia University)29/09/2026, 14:15Poster session IPoster
Energetic particle (EP)-driven Alfvénic instabilities have been shown to play an important role in stellarators, as demonstrated by neutral beam fast ions in the W7-AS [1] and TJ-II [2] experiments. Alfvénic instabilities may be similarly important in fusion power plants driven by fusion-born alpha particles. However, a comprehensive numerical study of the shear Alfvén continuum in modern...
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