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Prof. Yasushi Todo (National Institute for Fusion Science)01/10/2026, 14:15Poster session IPoster
We have developed a two-fluid model of the energetic-particle-driven geodesic acoustic mode (EGAM) in magnetically confined toroidal plasmas by applying fluid models to the bulk plasma and energetic particles separately. Analysis of the theoretical model reveals two EGAM solutions with high and low frequencies. In the high-frequency mode, the pressure perturbations of the two components...
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Rui Coelho (Instituto Superior Tecnico - IPFN)01/10/2026, 14:15Poster
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Anton Tykhyy (Institute for Nuclear Research, Kyiv, Ukraine)01/10/2026, 14:15Poster session IPoster
Mechanisms of destabilization of toroidal Alfvèn eigenmodes (TAE) in tokamaks are analyzed with the aim to reveal those leading to modes propagating in the direction opposite to plasma current, i.e. counter-propagating modes (ctr-TAE). Plasmas with fast-ions sources [such as neutral beam injection (NBI), ion cyclotron resonance heating (ICRH), fusion reactions] and without them (Ohmic...
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Massimo Nocente (Instituto Nazionale di Fisica Nucleare (EU))01/10/2026, 14:15Poster session IPoster
Following the end of the operations of the Joint European Torus (JET) and the recent development of a new baseline for ITER, future tokamaks will be based on a high Z first wall material and will no longer use beryllium. New developments in fast ion generation scenarios and neutron and gamma-ray diagnostics are necessary to provide both the instruments and the knowledge base required in...
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Yunpeng Zou (Institute of Plasma Physics, Chinese Academy of Science)01/10/2026, 14:15Poster session IPoster
The kinetic-magnetohydrodynamic hybrid code, MEGA, is employed to study the effect of energetic particle (EP) distribution on reversed shear Alfvén eigenmodes (RSAEs). Focusing on the most unstable (n=2) RSAE in an EAST discharge, the EP distribution is represented as a linear sum of multiple Gaussian functions, following Gorelenkov [Nucl. Fusion 45, 226 (2005)] and Liu [Phys. Plasmas 21,...
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Michael Van Zeeland (GAT - Fusion Energy Research General Atomics (US))01/10/2026, 14:15Poster session IPoster
Localized electron cyclotron heating (ECH) can have a dramatic effect on neutral beam driven toroidicity induced Alfvén eigenmode (TAE) activity in DIII-D plasmas. In these experiments, ECH with varied current drive phasing was deposited at large radius near the location of TAEs that have been recently reported to locally stabilize ITG turbulence through the generation of sheared flows [1]....
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Dr Xiao-Long Zhu (Southwestern Institute of Physics)01/10/2026, 14:15Poster session IPoster
In HL-3 H-mode plasma discharges, two new MHD instabilities have observed and identified. Both instabilities are localized in the outer region or the pedestal region of the plasma. The first is a low-frequency instability with f=0–50 kHz, exhibiting rapid frequency chirping and a toroidal mode number of n=3. It propagates in the ion diamagnetic drift direction, displays energetic-particle...
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Dr Henrik Järleblad (Department of Physics, Technical University of Denmark)01/10/2026, 14:15Poster session IPoster
In future fusion power plants, to ensure safe and reliable operation, it will be necessary to be able to accurately and efficiently measure the distribution of energetic particles[1]. Since the fast-ion distribution cannot be measured directly, we need to reconstruct it from diagnostic measurements[2]. The problem of reconstructing the fast-ion distribution given measurements is an...
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Mr Quentin Kernel (EPFL - Swiss Plasma Center)01/10/2026, 14:15Poster
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Lina Velarde (Universidad de Sevilla)01/10/2026, 14:15Poster session IPoster
Instabilities such as Edge Localised Modes (ELMs) can degrade confinement in tokamak plasmas [1, 2]. Externally applied Magnetic Perturbations (MPs) are used to suppress these instabilities [3]. This technique is still under investigation in many tokamaks, and its understanding is crucial for future fusion devices, as applying these perturbations can also have a detrimental effect on fast-ion...
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Charlson Kim (SLS2 Consulting)01/10/2026, 14:15Poster session IPoster
Linear (n=1) hybrid kinetic-MHD simulations have been performed with the NIMROD code to investigate energetic particle effects on (m=1,n=1) stability in SPARC plasmas. Understanding energetic particle-driven instabilities is critical for burning tokamaks, where fusion-born alphas can strongly modify the stability of MHD modes, impacting plasma confinement and performance. Using the SPARC...
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Xiaodi Du (GAT - Fusion Energy Research General Atomics (US))01/10/2026, 14:15
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Xin Wang01/10/2026, 14:15Poster session IPoster
Frequency chirping of Alfvénic modes is a ubiquitous signature of the nonlinear phase-space dynamics of energetic particles (EPs) in tokamaks [1], and the chirping rate carries direct information on the resonant EP redistribution that limits fast-ion confinement [1]. Recent work shows that the nonlinear dynamics of the thermal plasma — beat-driven zonal fields and zonal currents together with...
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Dr Jian Bao (Institute of Physics, Chinese Academy of Sciences)01/10/2026, 14:15Poster session IPoster
Recent fusion experiments have observed significant improvement in plasma confinement in the presence of fusion-born alpha particles [1,2], with Alfven eigenmodes playing a central role in regulating drift-wave microturbulence. First-principles gyrokinetic theory has proposed two mechanisms: direct three-wave interaction [3] and indirect interaction mediated via zonal fields or phase-space...
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Mirko Salewski (Technical University of Denmark (ZZ))01/10/2026, 14:15Poster session IPoster
Collective Thomson scattering (CTS) diagnostics have been installed at several machines and will be primary alpha-particle diagnostic at ITER. CTS measurements are sensitive to the projection of the local velocity distribution function in a measurement volume. The thermal ions with low projected velocities dominate the low-Doppler-shift part of CTS spectra whereas the fast ions with high...
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Jialei Wang (National Institute for Fusion Science)01/10/2026, 14:15
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Francesco Palermo (UKAEA)01/10/2026, 14:15Poster session IPoster
Spherical tokamaks (STs) represent one of the most promising research pathways towards fusion energy. Owing to their low aspect ratio, devices such as the Mega Amp Spherical Tokamak Upgrade (MAST-U) allow access to high-β plasma regimes, potentially offering a route towards more compact and efficient fusion reactors.
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In spherical tokamaks such as MAST-U, Alfvén Eigenmodes (AEs) can play an... -
William Heidbrink01/10/2026, 14:15Poster
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Taeuk Moon (Korea Institute of Fusion Energy)01/10/2026, 14:15Poster
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Mads Rud Larsen (École Polytechnique Fédérale de Lausanne)01/10/2026, 14:15Poster
A thorough understanding of the resonant interactions between fast
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ions and plasma instabilities is vital for the successful operation of burning plasmas in future devices, such as ITER. It is well described that fast ions can drive instabilities, causing confinement degradation or, alternatively, turbulence suppression [1]. Measuring the fast-ion distribution function from experimental data... -
Pengjuan Su01/10/2026, 14:15
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Kyle Callahan (UCI)01/10/2026, 14:15Poster
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Edward Parr (UKAEA, Abingdon, Oxfordshire, UK)01/10/2026, 14:15Poster session IPoster
The Charged Fusion Product Detector (CFPD) is a fast-ion diagnostic employing solid-state detectors to measure energies and production rates of charged fusion products [in particular p (3.02 MeV) and t (1.01 MeV) from D-D fusion] primarily from fast-ion induced reactions. Results obtained during the recent MU04 and MU05 (2024-26) MAST-U campaigns will be presented. The current diagnostic is an...
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