19th Technical Meeting on Energetic Particles in Magnetic Confinement Systems

Session

Poster session III and Coffee break

1 Oct 2026, 14:15

Beaulieu Congress and Exhibition Center (Lausanne, Switzerland)

102. A two-fluid model of the energetic-particle-driven geodesic acoustic mode

Prof. Yasushi Todo (National Institute for Fusion Science)

01/10/2026, 14:15

Poster session I

Poster

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...

120. Alpha Particles without DT: Alternative Routes in Future JT-60SA Plasmas

Rui Coelho (Instituto Superior Tecnico - IPFN)

01/10/2026, 14:15

Poster

40. Assessment of 1D critical gradient predictions of fast-ion transport in high q-min, high β, DIII-D steady-state scenario discharges

Jeff Lestz (University of California Irvine)

01/10/2026, 14:15

Poster session I

Poster

Several reduced models exist for predicting anomalous energetic particle (EP) transport that may be induced by instabilities such as Alfven Eigenmodes, spanning a wide spectrum of fidelity and computational cost. However, these models have typically been validated against isolated experimental discharges instead of databases, providing an incomplete assessment of their reliability and...

85. Destabilization of ctr-TAE modes: general analysis and a specific example

Anton Tykhyy (Institute for Nuclear Research, Kyiv, Ukraine)

01/10/2026, 14:15

Poster session I

Poster

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...

94. Development of scenarios and diagnostics for fast ion studies in next generation tokamaks without beryllium

Massimo Nocente (Instituto Nazionale di Fisica Nucleare (EU))

01/10/2026, 14:15

Poster session I

Poster

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...

95. Electron Cyclotron Heating Modification of Toroidicity Induced Alfvén Eigenmode Activity in DIII-D

Michael Van Zeeland (GAT - Fusion Energy Research General Atomics (US))

01/10/2026, 14:15

Poster session I

Poster

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]....

106. Energetic-ion Driven Instabilities during I-phase and inter-ELM in the HL-3 Tokamak

Dr Xiao-Long Zhu (Southwestern Institute of Physics)

01/10/2026, 14:15

Poster session I

Poster

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...

119. Experimental characterization of fishbones and associated energetic particle transport via correlated FIDA and FILD measurements on the TCV tokamak

Mr Quentin Kernel (EPFL - Swiss Plasma Center)

01/10/2026, 14:15

Poster

123. Further development of a phase space transport code with consistent sources and sinks

Tristan Sterkl (IPP - Max-Planck-Institut für Plasmaphysik (EU))

01/10/2026, 14:15

Poster session III

Poster

The transport of supra-thermal particles in fusion plasmas can only be inadequately described with a local and 1-d radial-diffusive transport model due to the broad orbits and resonances that occur. A general gyrokinetic transport theory has been developed in recent years - the Phase Space Zonal Structure transport theory [1, 2, 3, 4], which extends the conventional transport equations into...

82. Global and local monitoring of fast-ion losses in the presence of external magnetic perturbations in the MAST-U spherical tokamak using IR thermography and a Fast Ion Loss Detector

Lina Velarde (Dpto. de Física Atómica, Molecular y Nuclear, Universidad de Sevilla; Centro Nacional de Aceleradores (Universidad de Sevilla, Junta de Andalucía, CSIC))

01/10/2026, 14:15

Poster session I

Poster

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...

96. Hybrid Kinetic-MHD Analysis of Energetic Particle (1,1) Modes in SPARC

Charlson Kim (SLS2 Consulting)

01/10/2026, 14:15

Poster session I

Poster

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...

117. Measurements of Fast Ion Distribution During the Alfvén Eigenmode-Induced Microturbulence Suppression in DIII-D

Xiaodi Du (GAT - Fusion Energy Research General Atomics (US))

01/10/2026, 14:15

104. Nonlinear frequency chirping of energetic-particle-driven Alfvénic fluctuations in ORB5 gyrokinetic simulations

Xin Wang

01/10/2026, 14:15

Poster session I

Poster

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...

110. Nonlinear saturation of toroidal Alfven eigenmode by self-organized zonal fields

Dr Jian Bao (Institute of Physics, Chinese Academy of Sciences)

01/10/2026, 14:15

Poster session I

Poster

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...

56. Phase- and velocity-space sensitivity of collective Thomson scattering measurements in magnetized plasmas

Mirko Salewski (Technical University of Denmark (ZZ))

01/10/2026, 14:15

Poster session I

Poster

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...

116. Phase-space mechanisms of ICRF-driven bursting shear Alfvén waves in tokamak plasmas

Jialei Wang (National Institute for Fusion Science)

01/10/2026, 14:15

84. Plasma shaping effects on fast particles and Alfvén eigenmodes dynamics in spherical tokamaks

Francesco Palermo (UKAEA)

01/10/2026, 14:15

Poster session I

Poster

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.
In spherical tokamaks such as MAST-U, Alfvén Eigenmodes (AEs) can play an...

115. Properties of Alfvén Eigenmodes during Strong Microturbulence Suppression

William Heidbrink

01/10/2026, 14:15

Poster

122. Qualitative validation of CAD-based simulations of NBI-induced prompt fast-ion losses against IRTV measurements in KSTAR

Taeuk Moon (Korea Institute of Fusion Energy)

01/10/2026, 14:15

Poster

21. Resonant mode-particle interaction priors for energetic particle phase-space tomography

Mads Rud Larsen (École Polytechnique Fédérale de Lausanne)

01/10/2026, 14:15

Poster

A thorough understanding of the resonant interactions between fast
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...

118. Simulation study of nonlinear wave-particle interaction of energetic particle modes in tokamak plasmas

Pengjuan Su

01/10/2026, 14:15

121. TGLF-EP+Alpha reduced fast ion transport prediction validation against diffusive transport measurements

Kyle Callahan (UCI)

01/10/2026, 14:15

Poster

51. The Charged Fusion Product Detector (CFPD) on MAST-U

Edward Parr (UKAEA, Abingdon, Oxfordshire, UK)

01/10/2026, 14:15

Poster session I

Poster

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...