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Dr David Tskhakaya (Institute of Plasma Physics of the Czech Academy of Sciences)02/10/2023, 09:00
Kinetic and fluid modelling of the SOL
D. Tskhakaya1, I. Borodkina1, O. Shyshkin1
1Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Prague 8, Czech Republic
Plasma transport modelling in the Scrape-Off Layer (SOL) represents one of the most complex numerical studies used in magnetic confinement fusion. These models require...
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Prof. Livia Casali (Department of Nuclear Engineering, The University of Tennessee, Knoxville)02/10/2023, 09:50
Impurity seeding studies were performed for the first time in the slot divertor at DIII-D, showing that with suitable use of radiators, full detachment is possible without degradation of core confinement [1]. First ever multi species SOLPS-ITER simulations including full cross-field drifts and neutral-neutral collisions activated in DIII-D demonstrate the importance of target shaping and...
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Giovanni Di Giannatale02/10/2023, 11:00
On the road to fusion energy production, many efforts have been done in order
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to address the well-known problem of anomalous transport in tokamak devices.
Understanding and predicting this phenomenon is a key issue towards the development of future fusion reactors. The understanding of turbulent transport has made tremendous
progresses in the last decade thanks to dedicated experimental... -
Linda Podavini02/10/2023, 11:40
Turbulence-driven transport is still one of the main obstacles to overcome in order to obtain feasible thermonuclear reactors. For this reason, the microinstabilities that are found to drive turbulence have been extensively studied in the last decades, both analytically and numerically. In such studies, assumptions about plasma parameters and magnetic geometry are generally made, making...
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Yann Munschy (IRFM - CEA Cadarache - France)02/10/2023, 12:05
The interaction between the plasma and the solid wall at the divertor/limiter target in tokamak devices affects turbulence in the plasma edge, thus impacting the overall confinement [1,2]. While the gyrokinetic framework allows one to describe turbulence and transport in the core of tokamak plasmas, most of present gyrokinetic codes still lack an adequate description of plasma-wall interaction...
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Georgia Acton (University of Oxford)02/10/2023, 14:00
Turbulent transport has long been understood to be the dominant transport mechanism in tokamaks. Stellarators, such as W7X, that have been optimised to reduce collisional (neoclassical) transport are also expected to be limited by turbulent transport [1]. Combined theoretical, computational, and experimental progress has advanced our understanding of turbulence properties and the resultant...
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Hubert BATY02/10/2023, 14:40
see file below
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Dr Federico Cipolletta (Barcelona Supercomputing Center (BSC))02/10/2023, 15:05
JOREK [1] is one the most advanced non-linear simulation codes for studying MHD instabilities that can occur in magnetically confined fusion plasmas as well as their control. It leverages extensive parallel programming to obtain accurate results regarding the dynamics of the high-energy magnetically confined plasma inside the vacuum vessel of a tokamak or stellarator. In addition, a...
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Emanuele Poli02/10/2023, 16:00
Electron cyclotron (EC) waves offer several advantages as a heating scheme in a tokamak fusion reactor, both from the technological (the launchers require small slots in the blanket; the first tritium barrier can be incorporated into the vacuum vessel) and the physical (easy wave-plasma coupling; localized absorption) point of view. The most crucial applications of EC waves in a reactor are the...
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Dirk Van Eester02/10/2023, 16:40
The numerical study of steady state solutions of equations describing the particle and energy balance rightfully gets ample attention since the ultimate goal of fusion research is to produce long-lasting quasi-stationary discharges in future fusion power stations. Transient states may, however, differ significantly from the steady state ultimately reached and will - in practice - impact on the...
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Ioannis Kominis02/10/2023, 17:05
Resonant mode-particle interactions crucially determine particle, energy and momentum transport and confinement performance in fusion devices. Non-axisymmetric perturbative modes exist either due to intrinsic instabilities, or due to intentionally applied magnetic fields and affect particles with specific kinetic characteristics by modifying specific locations of the particle’s phase space [1]...
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luca volpe (ETSIAE Universidad Politecnica de Madrid, Centro de Laseres Pulsados (CLPU), Salamanca, Spain)03/10/2023, 09:00
Inertial Fusion Energy production using lasers represents a key approach to nuclear fusion energy on earth. The concept of laser-driven Inertial Confinement thermonuclear Fusion (ICF) was proposed in 1972 in seminal papers by American and Russian scientists [Basov1972, Nuckolls1972], which initiated a worldwide effort to demonstrate inertial fusion in the laboratory. After five decades of...
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Prof. Geert Verdoolaege (Ghent University)03/10/2023, 09:50
Global energy confinement studies based on empirical scaling expressions represent an important instrument for benchmarking experiments in tokamaks and stellarators, for specification of boundary conditions in modeling activities, for guiding the development of theoretical models of heat transport and for extrapolating plasma performance to new machines, such as ITER.
In this contribution,...
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Silvia Trinczek (Princeton University/Princeton Plasma Physics Laboratory)03/10/2023, 11:00
We present a new model to describe neoclassical transport in strong gradient regions in tokamaks such as internal transport barriers and the pedestal [1]. Previous work on neoclassical transport across transport barriers assumed large density and potential gradients but a small temperature gradient [2], or neglected the gradient of the mean parallel flow [3]. Using a large aspect ratio and low...
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Leonard-Petru Turica (Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford, OX13PU, UK, United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, OX14 3DB, UK, University College, Oxford, OX1 4BH, UK)03/10/2023, 11:40
Making use of a large experimental database of pedestals of H-mode ELMy JET-ILW pulses [1], we propose several approaches to systematic prediction of the height of the electron-temperature pedestal and of the electron temperature at the top of the density pedestal, with the engineering parameters and the density profiles as inputs. Simulations of ETG turbulence in steep-gradient regions of the...
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Atilla Altintas03/10/2023, 12:05
Next-generation fusion reactors pose challenges for plasma-facing components (PFCs) made from solid materials due to the high heat and particle fluxes. To overcome these limitations, liquid-metal (LM) PFC concepts have been proposed recently, with electromagnetic restraint (Lorentz force) as a key mechanism to keep free-surface LM flows attached to reactor surfaces [1]. Therefore, the...
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Verena Mitterauer (Max Planck Institute for Plasma Physics)03/10/2023, 14:00Invited
The presentation will introduce the principles of suppressing edge localized modes (ELMs) by external magnetic perturbations (RMPs). It will explain models that allow the description of the processes and highlight recent developments. Direct comparisons between simulations and experiments will be shown, and an outlook to the application for future machines like ITER will be given.
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The... -
Sven Korving (Eindhoven University of Technology)03/10/2023, 14:40
An accumulation of heavy impurities in the tokamak core is detrimental for its performance and can lead to disruption of the plasma. In smaller to medium size tokamaks the effective neoclassical transport in the pedestal is radially inwards [3]. In larger tokamaks---e.g. ITER--- where the temperature gradient is higher, the neoclassical transport is predicted to be outwards. The models are...
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Artur Kryzhanovskyy03/10/2023, 15:05
A possible triggering mechanism of Alfvén waves (AWs) in tokamak plasmas, based on localized perturbations induced by magnetic reconnection events, is discussed in the framework of nonlinear viscoresistive 3D MHD modeling.
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Nicolas Lopez (University of Oxford)03/10/2023, 16:00Poster
Nicolas Lopez
University of OxfordA wave near an isolated turning point is typically assumed to have an Airy function profile with respect to the separation distance. This description is incomplete, however, and is insufficient to describe the behavior of more realistic wavefields that are not simple plane waves [1]. Asymptotic matching to a prescribed incoming wavefield generically...
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Vandana Dwarka (Delft University of Technology)03/10/2023, 16:04Poster
One of the most well-established codes for modeling non-linear Magnetohydrodynamics (MHD) for tokamak reactors is JOREK, which solves these equations with a Bézier surface based finite element method. This code produces a highly sparse but also very large linear system. The main solver behind the code uses either GMRES or Bi-CGSTAB with a physics-based preconditioner, but even with the...
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Joachim Jacques Koerfer (Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC))03/10/2023, 16:08
Tungsten divertors in tokamaks are designed to withstand and evacuate the excess heat coming from the hot plasma. Some of the tungsten divertor can melt, enter the plasma, and itself become a high-Z impurity plasma. If it enters the core, it can emit enough radiation to cause a loss of thermal plasma energy and degrade or terminate tokamak operation [1]. Thus, it is crucial to develop a...
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daniela grasso (ISC-CNR)03/10/2023, 16:12
The role of a runaway current in a post disruption plasma is investigated through numerical simulations in the single helicity limit. Linear results are verified against analytical theory and benchmarked against results already present in the literature. In particular, the presence of a microlayer below the resistive one is confirmed and the effect of the electron inertia on it is also...
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Brenno Jason Sanzio Peter De Lucca (École Polytechnique Fédérale de Lausanne)03/10/2023, 16:20Poster
Evolving a two-fluid model based on the drift-reduced Braginskii equations [1], GBS [2] is a three-dimensional flux-driven turbulence code designed for simulating plasma turbulence and kinetic neutral dynamics in the tokamak boundary. The GBS simulation domain covers the entire tokamak volume, avoiding the need for an artificial boundary between the core and edge regions, thus preserving the...
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Lu Zhixin (Max Planck Inistitute of Plasma Physics)03/10/2023, 16:24Poster
To enhance the computational efficiency of particle codes in performing multi-n nonlinear simulations, piecewise finite elements have been developed in tokamak plasma, along with previous work [1,2,3]. Clebsch coordinates are constructed depending on the toroidal domain, which is consistent with the finite difference scheme [1]. In this work, the cubic spline finite element is adopted [3]. The...
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Dr Marco Veranda (Consiglio Nazionale delle Ricerche ISTP - Consorzio RFX)03/10/2023, 16:28Poster
This work deals with the relation/interaction between plasma flow and magnetic field during the process of reversed-field pinch (RFP) quasi-helical self-organization [1, 2], featuring improved confinement in the RFX-mod RFP [3].
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Experimental [3] and modelling [4] evidence shows that helical self-organization is characterized by quasi-periodical relaxation-reconnection events: partial... -
Vincent Maquet (LPP-ERM/KMS)03/10/2023, 16:32Poster
ICRH is an attractive auxiliary heating system for future fusion reactors as it enables direct power deposition to the ions and does not suffer from high density cutoffs. However, ICRH launcher structure needs to be positioned close to the edge plasma to efficiently couple the launched power. This gives rise to enhanced plasma wall interactions near and far from the launching structure. One of...
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Samuel Ernst (1 EPFL, Swiss Plasma Center, Lausanne)03/10/2023, 16:36Poster
The gyromoment (GM) approach was developed by B. J. Frei et al. [1] to address the challenges associated with the gyrokinetic (GK) modeling of turbulent dynamics in the boundary region of fusion devices. Based on expanding distribution functions onto a Hermite-Laguerre polynomial basis and evolving in space and time the expansion coefficients, the GM approach has the potential to efficiently...
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Lukas Bähner (KTH Royal Institute of Technology, Division of Electromagnetic Engineering and Fusion Science)03/10/2023, 16:40Poster
Ion cyclotron resonance heating (ICRH) is known to create a population of fast ions in fusion plasmas. The non-Maxwellian distribution functions are obtained by solving the Fokker-Planck equation and are needed to describe the radio-frequency wave power deposition and transport phenomena.
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This work uses wave fields and power deposition predicted by FEMIC [1], a finite element model for ICRH.... -
Yen Chen Chen (National Center for High-Performance Computing, National Applied Research Laboratories, Taiwan)03/10/2023, 16:44Poster
We apply the Physics-informed Neural Networks (PINNs) to the magnetohydrodynamic (MHD) simulations. We build a neural network to find a solution of the MHD equations. We use the coordinate of space-time as model inputs and the outputs of the model are the magnetic field, the plasma bulk velocity, the plasma mass density, and the plasma thermal pressure. The MHD equations are combined into the...
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Nicolas DUBUIT ((Aix-Marseille Université, CNRS, PIIM UMR 7345, Marseille, France))03/10/2023, 16:48Poster
Neoclassical tearing modes (NTM) are metastable magnetic islands in tokamaks; however, they appear frequently in experiments without any noticeable triggering event. In order to understand this, it has been numerically shown that turbulence can create a seed island by mode coupling [1,2,3], even remotely [4] ; such a seed island has been shown in 2D models to further grow from the NTM...
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Zetao Lin (Aix-Marseille Université)03/10/2023, 16:52Poster
Confinement quality in fusion plasma is significantly influenced by the presence of heavy impurities, e.g. Tungsten, which can lead to radiative heat loss and reduced confinement. This study explores impurity transport modeled by inertial particles in edge plasma, a previously unexamined aspect in plasma physics, using high-resolution direct numerical simulations of the Hasegawa-Wakatani...
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Pietro Vincenzi (Consorzio RFX, Padova)03/10/2023, 16:56Poster
The dependence of L-H transition power threshold on plasma density is well documented and captured by the “ITPA 2008 scaling” [1] for high density D plasmas. In view of ITER operations, several studies with different H isotopes resulted in a 1/A mass dependence of the threshold [2]. Of particular interest for ITER H-mode access at low auxiliary power is the existence of a minimum L-H power...
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Riccardo Ragona (Technical University of Denmark)03/10/2023, 17:04Poster
Parametric decay instabilities might play a significant role in various plasma physics phenomena and have garnered considerable interest in recent years [1]. In this study, we compare a model of parametric decay instabilities against the data observed during experiments conducted in the AUG (ASDEX Upgrade) fusion device while performing Electron Cyclotron Wall Conditioning (ECWC)[2].
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During... -
Dr Andrei Ludvig-Osipov (Chalmers University of Technology)03/10/2023, 17:08Poster
Integrated modelling for magnetically confined tokamak plasmas is an indispensable tool in interpreting and in guiding the tokamak experiments. To evolve the plasma profiles (current, densities, temperatures), integrated modelling schemes solve a system of stiff diffusion-advection transport equations, constructed using a set of physical models for equilibrium, transport and sources. It is...
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Paul Costello (Max Planck Institute for Plasma Physics (IPP))03/10/2023, 17:12Poster
P. Costello1
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, G. G. Plunk1
, and P. Helander1
1 Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald, Germany
Since the development of gyrokinetic theory, a myriad of instabilities, which lead to
unwanted turbulent transport in tokamaks and stellarators, have been discovered. A recent
series of publications [1, 2, 3] have introduced a novel approach to computing... -
luca spinicci03/10/2023, 17:16Poster
Advanced numerical tools play a determinant role in the understanding of plasma dynamics. The nonlinear three-dimensional magneto-hydrodynamic (3D MHD) code SPECYL [1] investigates magnetic self-organisation processes in fusion plasmas in the Reversed Field Pinch (RFP) and in the tokamak configurations. In the past, SPECYL has been used to investigate the Quasi Single Helicity states (QSH) in...
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Mattia DICORATO03/10/2023, 17:20Poster
The tokamak H-mode regime of confinement relies on the formation of an edge transport barrier, resulting in the appearance of the so-called “pedestal” in the plasma profiles. Understanding the mechanisms responsible for the pedestal evolution and features is crucial for optimizing fusion performance in the next-generation devices, such as ITER. However, a complete understanding of the role of...
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Prof. Christos Tsironis (National Technical University of Athens, Athens, Greece)03/10/2023, 17:24Poster
The EC launcher conceptual design is moving towards an engineering design that will satisfy all physics requirements under the various system constraints, including maximum flexibility in case of further refinements of plasma scenarios and tasks [1]. In the current DEMO reference scenario, for the specific magnetic field and plasma density/temperature adopted, the gyrotron frequencies...
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Nicholas Vivenzi (Università degli studi di Padova)03/10/2023, 17:28Poster
Università degli Studi Padova - Consorzio RFX
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The strong uncertainty related to the estimate of the viscosity coefficient represents an important challenge in the application of magneto-hydrodynamics (MHD) simulation results to laboratory plasmas [1]. This is particularly relevant in the contest of the reversed-field pinch (RFP) configuration, where the viscosity together with the resistivity... -
Stefan Mijin03/10/2023, 17:32Poster
United Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science Centre
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Simulations of transport parallel to open magnetic field lines have been a source of insight into the complex physics of the Scrape-Off Layer and divertor for a long time, ranging from 1D fluid model simulations of detachment [1] to various kinetic models [2,3,4] looking at modifications of parallel... -
Felix Antlitz (Max Planck Institute for Plasma Physics)03/10/2023, 17:36Poster
Max Planck Institute for Plasma Physics
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Energetic particles will play a central role in future burning plasma experiments, and their
confinement is an important aspect for a fusion reactor. Understanding the effects of energetic
particles (EPs) is essential, as they can strongly interact with the main plasma and drive
magnetohydrodynamic (MHD) instabilities. One notable example is the... -
Will Clarke (University of Oxford)03/10/2023, 17:40Poster
University of Oxford
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We investigate the saturation of turbulence in a three-field, fluid model of a magnetised plasma in a Z-pinch magnetic geometry. The model is derived by taking a long-wavelength limit of gyrokinetics and subsequently ordering the electron-temperature-gradient (ETG) to be much larger than all other equilibrium gradients, while still retaining the curvature and... -
Annika Stier (Max-Planck-Insitiute for Plasma Physics)03/10/2023, 17:44Poster
The particle-in-cell code PICLS is a full-f finite element tool intended to simulate turbulence in the tokamak scrape-off layer using gyrokinetic ions and drift-kinetic electrons. Up until now however, PICLS has been a purely electrostatic code with a prescribed background magnetic field. This approach is not perfectly suited to represent unstable regimes occurring in the scrape-off layer,...
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Chiara De Piccoli (Università degli Studi di Padova, Consorzio RFX)03/10/2023, 17:48Poster
The Divertor Tokamak Test (DTT) [1],[2] is a superconducting device under construction in Frascati, Italy. DTT was proposed to assess the performance of a conventional ITER divertor and address the power exhaust issue that will affect future fusion devices as DEMO. DTT will be equipped with three auxiliary heating systems, including a Neutral Beam Injection (NBI) system. DTT NBI is a...
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Karima Bendib-Kalache03/10/2023, 17:52Poster
A linear theory of non local transport in relativistic unmagnetized plasmas is presented. The relativistic effects are due to high electron thermal energy. The relativistic Fokker-Planck equation is analytically solved for perturbed plasmas with respect to the global thermal equilibrium defined by the Maxwell–Boltzmann–Jüttner electron distribution function (EDF). The perturbed EDF is...
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Prof. Yannis Kominis (National Technical University of Athens)03/10/2023, 17:56Poster
The presence of non-axisymmetric perturbations of an axisymmetric toroidal magnetic field results in the chaoticity of the magnetic field lines and strongly affects the charged particle motion and therefore the particle, energy and momentum transport in toroidal plasmas [1-2]. Particle chaoticity is determined by resonance conditions relating the unperturbed Orbital Frequencies of the...
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Prof. Per Helander04/10/2023, 09:00
In this talk, I will give an overview of the history and present state of stellarator optimisation. Wendelstein 7-X was optimised for good magnetic flux surfaces, small Pfirsch-Schlüter and bootstrap currents, high MHD beta limit, and good neoclassical confinement. Most of these properties have already been confirmed experimentally, giving confidence that theory-based optimisation can pay off...
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Edilberto Sanchez04/10/2023, 09:50
The stellarator is an attractive concept for magnetic confinement fusion reactors, as it offers some advantages over the tokamak. Whereas in tokamaks part of the magnetic field is produced by driving a large inductive current in the plasma, the magnetic field of the stellarator is generated by external coils, avoiding the risk of current-driven instabilities and making steady-state operation...
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Iván Calvo04/10/2023, 11:00
See attached pdf file.
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Christopher Albert (Fusion@OEAW, TU Graz)04/10/2023, 11:40
A relatively simple way to evaluate bootstrap current in stellarators involves the use of the long mean free path asymptotic formula by Shaing and Callen [1]. This formula contains all the information about device geometry in a geometrical factor, independent of plasma parameters. This method is particularly suited for stellarator optimization, where multiple quick estimates of bootstrap...
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Brendan Shanahan (Max-Planck-Institut für Plasmaphysik)04/10/2023, 12:05
Recent advances in stellarator optimization have led to unprecedented improvement in neoclassical transport in Wendelstein 7-X [1] such that anomalous transport is contributing a significant portion of the transport, especially in the Scrape-Off-Layer (SOL) [2]. Here, we present isothermal fluid turbulence simulations using the BOUT++ framework [3,4] in the edge and scrape-off-layer (SOL) of...
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Philipp Walter Lauber04/10/2023, 14:00
Advanced transport models for energetic particles
Ph. Lauber 1, M. Falessi 2, A. Biancalani 3, A. Bottino 1, S. Briguglio 2, N. Carlevaro 2, V. Fusco 2,T. Hayward-Schneider 1, F. Holderied 1, A. Könies 4, Y. Li 2,6,Y.-Y. Li2 ,5,6, G. Meng 1, A. V. Milovanov 2, G. Montani 2, V.-A. Popa 1, S. Possanner 1, G. Vlad 2, X. Wang 1, M. Weiland 1, A. Zocco 4, F. Zonca 2
1 Max-Planck-Institut...
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Matteo Valerio Falessi04/10/2023, 14:40
In this contribution, we introduce the formulation of a self-consistent transport theory, based on the evolution of the renormalized plasma equilibrium in the presence of a finite level of electromagnetic fluctuations, which we call the zonal state (ZS). This formulation involves the derivation of the nonlinear equations for 1) the PSZS that are phase space structures undamped by collisionless...
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Juan Ruiz Ruiz (University of Oxford)04/10/2023, 15:05
Recent experiments using the 3-ion ICRH heating scheme [Kazakov NF 2015] have been successful at generating substantial populations of MeV range fast ions in the deep core of JET, mimicking the effect of fusion-born alpha particles in future burning plasmas. We analyze an ICRH heated L-mode in which fast ions destabilized a wide range of Alfvén eigenmodes (AEs) as observed using magnetics,...
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Yevgen Kazakov04/10/2023, 16:00Poster
The success of magnetic confinement fusion as energy source relies crucially on reaching high temperatures for the fuel D and T ions. In a fusion reactor, plasma heating with waves in the ion cyclotron range of frequencies (ICRF) is the only system capable to provide a large fraction of bulk ion heating. Furthermore, in view of better understanding non-linear physics of alpha heating in ITER...
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DARIO BORGOGNO (ISC-CNR)04/10/2023, 16:04
In ideal magnetized plasmas, sheet-like field discontinuities, where current and vorticity peak, naturally form. According to the linear theory, these layers undergo fluid and magnetic instabilities whose strength depends on the amplitude of the local magnetic field and flow. In non-ideal plasmas, in presence of magnetic reconnection, the combined action of the sheared flow and the sheared...
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David Korger (Max-Planck-Institut für Plasmaphysik)04/10/2023, 16:08
The geodesic-acoustic-mode (GAM) is a plasma oscillation observed in fusion reactors with toroidal geometry (such as the Tokamak or Stellarator) and are recognized to be the non-stationary branch of the zonal flows (ZFs). Similarly to the ZFs, GAMs are understood to regulate cross-field turbulence and thus enhance energy confinement [1]. Still, their direct effect on turbulence is not yet...
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Hugo de Blank (DIFFER - Dutch Institute for Fundamental Energy Research, De Zaale 20, 5612 AJ Eindhoven, The Netherlands)04/10/2023, 16:16
SOLPS-ITER modelling of plasma rotation with co-rotating atoms in the Magnum-PSI beam.
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H.J. de Blank1 , J. Verstappen1, J. Gonzalez2, I. Classen1, E. Westerhof1
1 DIFFER - Dutch Institute for Fundamental Energy Research. De Zaale 20, 5612AJ, Eindhoven, The Netherlands
2 ARCNL, P.O.Box 93019, 1090BA Amsterdam, The Netherlands
In the ITER divertor heat loads of 10 MWm-2 are expected in... -
Dr Christos Tsironis (School of Electrical and Computer Engineering, National Technical University of Athens)04/10/2023, 16:20Poster
A numerical tool modelling the excitation and evolution of electron avalanche ionization in the breakdown phase of start-up in tokamaks is presented. We estimate the energization efficiency of the nonlinear interaction between spatially localized Gaussian EC-fields propagating in vacuum with an ensemble of seed electrons. This process is coupled with the acceleration of electrons due to the...
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Guillermo Luis Godino-Sedano (CIEMAT)04/10/2023, 16:24Poster
The stellarator is a device designed to achieve controlled fusion by magnetic confinement.
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Despite several advantages over tokamaks, its lack of axisymmetry creates some difficulties to confine the plasma: in an unoptimised stellarator reactor, both thermal ions and the fast ions produced by DT fusion would be lost faster than in a tokamak. On the other hand, stellarators are characterised by... -
Francisco Javier Escoto Lopez (CIEMAT)04/10/2023, 16:28Poster
In order to be candidates to fusion power plants, stellarators must be optimized, i.e. the magnetic field needs to be tailored to have sufficiently good confinement properties. When the optimization process is performed to minimize neoclassical losses, the goal is to obtain a magnetic field that is close to omnigeneity. A magnetic field is omnigenous [1] if the radial drift of collisionless...
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Alan Goodman (Max Planck Institute for Plasma Physics)04/10/2023, 16:32Poster
Quasi-isodynamic (QI) stellarators are a uniquely attractive fusion reactor candidate due to their low neoclassical transport, excellent confinement of fusion-borne alpha particles, and vanishingly small bootstrap currents [1]. Due to the complexity of their geometries, QI stellarators must generally be designed through numerical optimization, which requires an objective metric that quantifies...
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Christoph Slaby (Max Planck Institute for Plasma Physics, Greifswald, 17491, Germany)04/10/2023, 16:36Poster
In the last experimental campaign of Wendelstein 7-X (W7-X) the new ICRH antenna [1] was brought into operation. With only one of the two antenna straps being operable in the last campaign, the available phasing options as well as the amount of power that could be coupled into the core plasma were limited. Nevertheless, the antenna is expected to be fully functional for the next operational...
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Sarah Newton (UKAEA)04/10/2023, 16:40Poster
Concentrated exhaust power deposition must be avoided in a fusion power plant. A strategy to prevent this is to seed heavy impurities in the divertor, which radiate strongly at the local plasma temperature. This can help to maintain a uniform power deposition over the divertor structure. However, if the impurity migrates upstream, it can produce a number of detrimental effects, including fuel...
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Dr Serafeim Misdanitis (University of Thessaly)04/10/2023, 16:44Poster
The neutral atoms in the plasma edge of nuclear fusion devices are typically modeled using a kinetic approach and more specifically the Monte Carlo (MC) code EIRENE [1]. Although EIRENE has been proved very reliable and effective, there are some drawbacks such as the statistical noise introduced by the MC techniques and the computational cost, which is significantly increased in high...
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Noah Chulu Chinn04/10/2023, 16:48Poster
Supra-thermal Energetic Particles (EPs) can be found in a burning tokamak plasma due to external heating methods such as Neutral Beam Injection and fusion reactions. EPs travelling at velocities close to the Alfvén speed can interact at resonance with various discrete Alfvén Eigenmodes which appear in the frequency gaps of the shear Alfvén continuum. Toroidal Alfvén Eigenmodes (TAE) are...
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Dr Philippe Lamalle (Laboratory for Plasma Physics, Royal Military Academy)04/10/2023, 16:52Poster
To accurately model the plasma dielectric properties in presence of rotational transform, most of the theoretical models and full-wave codes addressing radiofrequency wave propagation and absorption in tokamaks are based on toroidal and poloidal Fourier expansions of the RF fields (see for instance [1-4]). A significant drawback of this field representation is its lack of flexibility, in that...
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Mantas Abazorius (Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford)04/10/2023, 16:56Poster
To understand plasma behaviour in the scrape-off layer (SOL), we need to know the boundary conditions for the plasma and electromagnetic fields near a divertor. At the plasma-wall boundary, in the direction perpendicular to the wall, there are four length scales of interest. These are the Debye length $\lambda_D$, the ion gyroradius $\rho_i$, the projection of the collisional mean free path in...
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Yann Narbutt04/10/2023, 17:00Poster
Y. Narbutt1
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, A. Mishchenko1
, A. Zocco1
, K. Aleynikova1
and R. Kleiber1
1 Max Planck Institute for Plasma Physics, Greifswald, 17489, Germany
Magnetic confinement fusion requires high 𝛽 = 〈𝑝〉/(𝐵
2/2𝜇0), the ratio of plasma pressure to
magnetic pressure, to access high performances. Moderate 𝛽 can be beneficial for iontemperature-gradient (ITG) driven turbulence. However, as 𝛽 is... -
Alexandre Halbach04/10/2023, 17:04Poster
Integration of high fusion performance with sustainable power exhaust is one of the leading challenges of reactor-scale fusion devices. Current state-of-the-art simulation tools for scrape-off layer (SOL) plasmas, such as SOLPS-ITER, employ a finite volume plasma solver in 2D with either fluid or kinetic treatment of neutral transport [1]. However, with high-fidelity physics treatment, these...
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Michael Richard Hardman (Tokamak Energy)04/10/2023, 17:08Poster
Decades of research has demonstrated the necessity of using kinetic plasma models to accurately model the flux of heat and particles through the closed-field line region of tokamaks. In the much colder open-field-line region beyond the last closed flux surface (LCFS), fluid models are typically used to model the flux of heat and particles to the divertor. Recently, kinetic plasma models have...
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John Omotani (1United Kingdom Atomic Energy Authority, Culham Science Centre)04/10/2023, 17:12Poster
Modelling the large amplitude fluctuations of the plasma edge, particularly across the separatrix into the hot scrape-off layers of future reactors, can require costly full-f kinetic simulations, with heavily restricted time-step due to uninteresting fast waves [1]. Here we demonstrate the first steps in the implementation of a method allowing consistent evolution of the system up to the...
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José Luis Velasco (Laboratorio Nacional de Fusión, CIEMAT)04/10/2023, 17:16Poster
Stellarator magnetic configurations need to be optimized in order to meet all the required properties of a fusion reactor. The stellarator Wendelstein-X (W7-X) was optimized to be approximately quasi-isodynamic (QI). In an exactly QI field, trapped particles orbit, on average, in the poloidal direction, and therefore remain confined [1]. Neoclassical transport is thus expected to be low....
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Barbara Momo (Consorzio RFX (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA), C.so Stati Uniti 4, 35127, Padova, Italy)04/10/2023, 17:20Poster
This work is based on the variational principle for magnetic field lines introduced in 1983 by Cary and Littlejohn [1]. The action principles for magnetic field lines and for Hamiltonian mechanics are recalled to be analogous. It is shown that the first one can be rigorously proved from first principles without analytical calculations. Not only the action principles are analogous, but also a...
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Susanna Cappello (Conaorzio RFX- ISTP CNR)04/10/2023, 17:24Poster
Since the early 90ties, 3D nonlinear MHD studies have been developing a fundamental framework for the understanding of the Reversed Field Pinch (RFP) self-organization. The simple visco-resistive MHD approximation clearly shows that 3D reconnection processes strongly characterize the dynamics in an ample range of the dimensionless Lundquist/Hartmann numbers, as well as in experimental...
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Björn Zaar (KTH Royal Institute of Technology)04/10/2023, 17:28Poster
Importance of Parallel Dispersion in ICRF Modelling of Travelling Wave Antenna Concept in DEMO-Like Plasmas in 2D Axisymmetry
B. Zaar$^1$, T. Johnson$^1$, L. Bähner$^1$, R. Bilato$^2$, R. Ragona$^3$, and P. Vallejos$^4$
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$^1$KTH Royal Institute of Technology, Stockholm, SE-114 28, Sweden
$^2$Max-Planck-Institut für Plasmaphysik, Garching, D-85748, Germany
$^3$Department of Physics,... -
Maria Filomena Ferreira Nave (Instituto Superior Técnico, Lisbon)04/10/2023, 17:32Poster
M. F. F. Nave1, A. Mauriya1, M. Barnes2, E. Delabie3, J. Ferreira1, J. Garcia4 , A. Kirjasuo5, F.I. Parra6, M. Romanelli7 and JET Contributors*
EUROfusion Consortium, JET, Culham Science Centre, Abingdon, OX14 3DB, UK
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1Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, P1049-001 Lisboa, Portugal
2Rudolf Peierls Centre for Theoretical Physics, Oxford University, UK
3Oak... -
Dr Nicolas Dubuit (Aix-Marseille University)04/10/2023, 17:36Poster
The dynamics of magnetic islands and the role they play in fusion plasmas are usually approached and predicted using extensions of the original theory by Rutherford [1, 2], on which estimates for their impact on the operation of present and future magnetic confinement devices are based. Likewise, diagnostics to detect their presence [3] and techniques to limit their impact are operated on the...
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Antoine Pierre Emmanuel Alexis Merle04/10/2023, 17:40
Implementation of an analytical Jacobian in the MEQ free-boundary tokamak equilibrium code suite
See attached PDF.
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Guo Meng (Max-Planck-Institut für Plasmaphysik)04/10/2023, 17:44Poster
Recently, a general theoretical framework for the transport of Phase Space Zonal Structures (PSZS) has been developed \cite{zonca2015,falessi2019}. PSZS are the long-lived toroidal symmetric ($n=0$) structures that define the nonlinear equilibrium in the presence of fluctuations such as Alfv\'enic instabilities. In order to include sources and sinks and collisional slowing down processes, a...
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Felix Parra04/10/2023, 17:48Poster
Building on previous work [1, 2, 3], we develop a new set of linear equations to determine the magnetic geometry coefficients needed for local gyrokinetic simulations on a flux surface of interest. The inputs required for the model are the shape of the flux surface, the radial derivative of that shape and four constants. One possible choice for these four constants is the pressure gradient,...
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alessandro zocco04/10/2023, 17:52Poster
Max-Planck-Institut für Plasmaphysik
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Within the gyrokinetic formalism [1-2], we present the equations for an explicit treatment of the electromagnetic version of the collisionless Universal/Trapped-Electron, and Microtearing modes, in general geometry. The gradient of the plasma , the ratio of kinetic to magnetic pressure, is taken to be small enough to avoid perturbations of the magnetic... -
Dr Boumediene TOUIL (Laboratoire Electronique Quantique, Faculté de Physique, USTHB, Algiers, Algeria / Department of Sciences and Technology, Faculty of Applied Sciences, Ibn Khaldoun University, BP 78, Tiaret, Algeria)04/10/2023, 17:56Poster
Nonlinear inverse bremsstrahlung absorption (NLIBA) of intense electromagnetic waves in homogeneous plasmas may have significant impact on many physical phenomena through modifications of the electron distribution function (EDF). These modifications depend on the relevant parameter $ \alpha=\frac{v_0^2}{v_t^2\ } $, where $v_0 $ is the quiver velocity and $v_t $ is the electron thermal...
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Magali MURAGLIA05/10/2023, 09:00
Magnetic reconnection consists in a modification of magnetic field topology leading to the formation of island-shaped magnetic structures. Magnetic reconnection is ubiquitous in magnetized plasmas. It is found in space plasmas (with the well-known example of sunspots of the solar flares[1]) as well as in fusion plasmas on earth[2].
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The idea of the non-conservation of magnetic connectivity... -
Camille Granier05/10/2023, 09:50
This talk introduces the application of a Hamiltonian gyrofluid approach to investigate magnetic reconnection and associated secondary instabilities, while considering finite Larmor radius corrections, parallel magnetic field fluctuations, and electron inertia. During the nonlinear development of spontaneous magnetic reconnection, non-collisional current sheets form, characterized by their...
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Arnas Volcokas05/10/2023, 11:00
In this work, we use local nonlinear gyrokinetic simulations of tokamaks to demonstrate that turbulent eddies can extend along magnetic field lines for hundreds of poloidal turns when the magnetic shear $\hat{s}$ is very weak or zero [1]. We find that as the magnetic shear is lowered, the parallel eddy length scales like 1/$\hat{s}$. At zero magnetic shear, their length is limited only by...
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Vadim Yanovskiy05/10/2023, 11:40
Over the past three decades, extensive research has been conducted on halo currents to assess the thermal [1] and electromagnetic stresses [2] imposed on the ITER wall during plasma disruptions. However, the contribution of these currents to the generation of sideways forces on the tokamak vacuum vessel still remains poorly understood, which raises concerns [3, 4]. In order to address this...
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Mr Plamen Ivanov (University of Oxford)05/10/2023, 12:05
The performance of magnetic-confinement-fusion devices is often limited by the presence of turbulent fluctuations that lead to enhanced transport and energy losses. Both experimental and numerical investigations have shown that the turbulent fluctuations, and thus the transport properties of magnetised plasma, are influenced by the presence of sheared flows [1, 2, 3, 4]. Such flows can be...
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Michele Romanelli (Tokamak Energy Ltd)05/10/2023, 14:00
The ST40 tokamak [1], built and operated by Tokamak Energy, is a high field spherical tokamak (ST), B=2.2T at R0=0.4 – 0.5m, A=1.6 – 1.9 with a mission to extend the ST reactor physics basis [2]. Overall energy confinement in STs is largely determined by turbulent electron heat transport, with ion thermal conductivity close to neoclassical levels in higher collisionality H-modes. Electron...
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Mikhail Gryaznevich (Tokamak Energy Ltd)05/10/2023, 14:25
Until recently, theoretical studies in support of the commercial realization of fusion energy mostly focused on research in support of ITER and on the analysis of plasmas in existing tokamaks and stellarators, far from ignition conditions. Recent appearance of privately funded research has advanced alternative concepts, in particular the development of high-beta spherical configuration and...
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Yujia Zhang (1Rudolf Peierls Centre for Theoretical Physics, University of Oxford,)Poster
A two-species (one main ion and electrons) fluid model for describing ion temperature gradient (ITG) turbulence in a Z-pinch magnetic geometry has been derived from gyrokinetics. Firstly, we carry out a mass ratio expansion ($\sqrt{m_e/m_i} \ll 1$) similar to the procedure introduced in \cite{Schekochihin_2009}. It is then followed by small $k_{\perp}\rho_i$ expansion, where $k_{\perp}$ is the...
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Michal Kuczynski (Max Planck Institute for Plasma Physics, Greifswald)Poster
Transport phenomena in fusion plasma devices can be categorized into turbulent and neoclassical parts. Although the primary contribution to particle and heat losses in both tokamaks and optimized stellarators is originates from turbulence, the significance of neoclassical transport theory should not be overlooked. Its applications, for example the prediction of the bootstrap current, are of...
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