A5050753118- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Laser-induced spectroscopy and plasma
- Electrostatic Discharge in Electronics
- Quantum chaos and dynamical systems
- Gyrotron and Vacuum Electronics Research
- Quantum Chromodynamics and Particle Interactions
- Fluid Dynamics and Turbulent Flows
- Nuclear physics research studies
- Geophysics and Gravity Measurements
- Radiation Effects in Electronics
- GNSS positioning and interference
- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Particle Detector Development and Performance
- Metallurgical Processes and Thermodynamics
Max Planck Institute for Plasma Physics
2016-2025
Institut de Recherche sur la Fusion par Confinement Magnétique
2024
CEA Cadarache
2020-2024
Max Planck Society
2012-2021
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2020
Plasma Technology (United States)
2019
Fusion Academy
2019
Fusion (United States)
2019
Hanyang University
2019
Max Planck Institute for Plasma Physics - Greifswald
2019
Abstract In 2021 JET exploited its unique capabilities to operate with T and D–T fuel an ITER-like Be/W wall (JET-ILW). This second major campaign (DTE2), after DTE1 in 1997, represented the culmination of a series enhancements—new fusion diagnostics, new injection capabilities, refurbishment plant, increased auxiliary heating, in-vessel calibration 14 MeV neutron yield monitors—as well as significant advances plasma theory modelling community. DTE2 was complemented by sequence isotope...
Abstract The ASDEX Upgrade (AUG) programme is directed towards physics input to critical elements of the ITER design and preparation operation, as well addressing issues for a future DEMO design. Since 2015, AUG equipped with new pair 3-strap ICRF antennas, which were designed reduction tungsten release during operation. As predicted, factor two on ICRF-induced W plasma content could be achieved by sheath voltage at antenna limiters via compensation image currents central side straps in...
Abstract For the past several years, JET scientific programme (Pamela et al 2007 Fusion Eng. Des . 82 590) has been engaged in a multi-campaign effort, including experiments D, H and T, leading up to 2020 first with 50%/50% D–T mixtures since 1997 ever plasmas ITER mix of plasma-facing component materials. this purpose, concerted physics technology was launched view prepare campaign (DTE2). This paper addresses key elements developed by directly contributing preparation. intense preparation...
ASDEX Upgrade has recently finished its transition towards an all-W divertor tokamak, by the exchange of last remaining graphite tiles to W-coated ones. The plasma start-up was performed without prior boronization. It found that large He content in plasma, resulting from DC glow discharges for conditioning, leads a confinement reduction. After change D inter-shot quickly dropped and, parallel, usual H-Mode with H factors close one achieved. initial conditioning phase, oxygen concentrations...
Recent developments in theory-based modelling of core heavy impurity transport are presented, and shown to be necessary for quantitative description present experiments JET ASDEX Upgrade. The treatment impurities is complicated by their large mass charge, which result a strong response plasma rotation or any small background electrostatic field the plasma, such as that generated anisotropic external heating. These forces lead poloidal asymmetries density, have recently been added numerical...
A novel code is presented, which capable of computing the NBI fast-ion distribution in real-time. We discuss approximations needed to arrive at this goal: a simplified beam geometry used for calculating attenuation. Finite-orbit-width effects are taken into account by an orbit average deposition. The time-dependent solution Fokker–Planck equation (2D velocity) then calculated based on analytic expressions. This currently takes ≈25 ms per time step, roughly factor 1000 faster than more...
A comparison of the ASDEX Upgrade 3-strap ICRF antenna data with linear electromagnetic TOPICA calculations is presented.The substantiates a reduction local electric field at radially protruding plasma-facing elements as relevant approach for minimizing tungsten (W) sputtering in conditions when slow wave strongly evanescent.The measured reaction time-averaged RF current limiters to feeding variations less sensitive than predicted by calculations.This likely have been caused temporal and...
A significant reduction of the turbulence-induced anomalous heat transport has been observed in recent studies magnetically confined plasmas presence a fast-ion fractions.Therefore, control populations with external heating might open way to more optimistic scenarios for future fusion devices.However, little is known about parameter range relevance these effects which are often only highlighted correlation substantial electromagnetic fluctuations.Here, fast ion induced stabilization also...
The evolution of the JET high performance hybrid scenario, including central accumulation tungsten (W) impurity, is reproduced with predictive multi-channel integrated modelling over multiple confinement times using first-principle based core transport models.8 channels ( , ) are modelled predictively, self-consistent sources, radiation and magnetic equilibrium, yielding a system non-linearities: This can reproduce observed radiative temperature collapse after several times.W transported...
This paper summarizes the physical principles behind novel three-ion scenarios using radio frequency waves in ion cyclotron range of frequencies (ICRF). We discuss how to transform mode conversion electron heating into a new flexible ICRF technique for and fast-ion generation multi-ion species plasmas. The theoretical section provides practical recipes selecting plasma composition realize scenarios, including two equivalent possibilities choice resonant absorbers that have been identified....
A novel type of transport barrier for reducing turbulent in the core a high temperature magnetically confined fusion plasma has been observed during experiments performed on ASDEX Upgrade tokamak.
Recent experiments at ASDEX Upgrade have achieved advanced scenarios with high βN (>3) and confinement enhancement over ITER98(y, 2) scaling, HH98y2 = 1.1–1.5, in steady state. These discharges been obtained a modified divertor configuration for Upgrade, allowing operation higher triangularity, changed neutral beam injection (NBI) system, more tangential, off-axis deposition. The figure of merit, βNHITER89-P, reaches up to 7.5 several seconds plasmas approaching stationary conditions....
We present here the first phase-space characterization of convective and diffusive energetic particle losses induced by shear Alfvén waves in a magnetically confined fusion plasma. While single toroidal eigenmodes (TAE) cascades (AC) eject resonant fast ions process, an overlapping AC TAE spatial structures leads to large fast-ion diffusion loss. Diffusive have been observed with above certain threshold fluctuation amplitude.
A source describing the injection of fast ions due to ionization high-energy neutral beams has been added surface-averaged quasilinear Fokker–Planck code SSFPQL (Brambilla 1994 Nucl. Fusion 34 1121 ). For this purpose, multiple-beam NBI SINBAD (Feng et al 1995 Comput. Phys. Commun. 88 161) included as a module in SSFPQL, with modifications required handle arbitrary axisymmetric equilibria. Alternatively, beam (NBI) can be built using output Monte Carlo code. We have also term losses during...
Experiments with boron-coated side limiters of two antennas operated together in 2012 showed that the are responsible for more than half increased W content plasma. Together contribution from other limiter tiles, not replaced 2012, account at least thirds content. A modified test two-strap ion cyclotron range frequency (ICRF) ASDEX Upgrade broad and narrow straps has shown an improved operation full wall 2011/2012 campaigns up to a 40% lower rise concentration allowing stable low deuterium...
Recent progress in the understanding and prediction of tungsten behaviour core JET H-mode plasmas with ITER-like wall is presented. Particular emphasis given to impact poloidal asymmetries impurity density. In particular, it shown that predicted reduction temperature screening induced by presence low field side localization density produced centrifugal force consistent observed a discharge baseline scenario. This provides first evidence role reducing strength screening. The main differences...
Abstract Experiments on ASDEX Upgrade (AUG) in 2021 and 2022 have addressed a number of critical issues for ITER EU DEMO. A major objective the AUG programme is to shed light underlying physics confinement, stability, plasma exhaust order allow reliable extrapolation results obtained present day machines these reactor-grade devices. Concerning pedestal physics, mitigation edge localised modes (ELMs) using resonant magnetic perturbations (RMPs) was found be consistent with reduction linear...
The Alfvén instability nonlinearly excited the energetic-particle-driven geodesic acoustic mode on ASDEX-Upgrade tokamak, as demonstrated experimentally. mechanism of excitation and nonlinear evolution is not yet fully understood. In present work, a first-principles simulation using MEGA code investigated properties in both linear growth saturated phases. Here we show that successfully reproduced coexistence these two modes, agreed with experimental results well. Conclusive evidence showed...
Ion cyclotron resonance heating is a versatile method that has been demonstrated to be able efficiently couple power directly the ions via fast magnetosonic wave. However, at temperatures relevant for reactor grade devices such as DEMO, electron damping becomes increasingly important. To reduce damping, it possible use an antenna with spectrum dominated by low parallel wavenumbers. Moreover, using unidirectional spectrum, travelling wave array antenna, wavenumber can downshifted mounting in...
Abstract For successfully heating plasma with waves in the Ion Cyclotron Range of Frequencies (ICRF), mitigating impurity production is just as crucial maximizing power coupling, especially high-Z environments [Urbanczyk 2021]. Only when coupled limited influence on production, can ICRF truly become a powerful tool to directly deposit energy ions, modify turbulence-driven transport and enhance efficiency fusion reactions. 
To do so, one must rely toroidal array at least three active...
Abstract On the basis of several recent breakthroughs in fusion research, many activities have been launched around world to develop power plants on fastest possible time scale. In this context, high-fidelity simulations plasma behavior large supercomputers provide one main pathways accelerating progress by guiding crucial design decisions. When it comes determining energy confinement a magnetic device, which is key quantity interest, gyrokinetic turbulence are considered approach choice –...
Abstract We review the physics of energetic particles (EPs) in magnetically confined burning fusion plasmas with focus on advances since last update ITER Physics Basis (Fasoli et al 2007 Nucl. Fusion 47 S264). Topics include basic EP physics, generation, diagnostics EPs and instabilities, interaction thermal plasma EP-driven particle modes (EPMs), turbulence, linear nonlinear stability simulation instabilities EPMs, 3D effects, scenario optimization strategies based phase-space control,...
A comprehensive suite of diagnostics has allowed detailed measurements the Alfvén eigenmode (AE) spatial structure and subsequent fast-ion transport in ASDEX Upgrade (AUG) tokamak [1]. Reversed shear eigenmodes (RSAEs) toroidal induced (TAEs) have been driven unstable by fast ions from ICRH as well NBI origin. In ICRF heated plasmas, diffusive convective losses AEs characterized phase space. While single RSAEs TAEs eject resonant a process directly proportional to fluctuation amplitude, δ B...
Recent upgrades to the FIDA (fast-ion D-alpha) diagnostic at ASDEX Upgrade allow reconstruct fast-ion phase space several radial positions with decent energy and pitch resolution. These new capabilities are applied study physics of 2nd harmonic ion cyclotron heating, which is a foreseen heating scenario for ITER. In particular, acceleration deuterium beam ions above injection by absorption waves investigated compared theoretical predictions TORIC-SSFPQL TORIC-NUBEAM code packages....