A5009716626- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Solar and Space Plasma Dynamics
- Nuclear reactor physics and engineering
- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- Plasma Diagnostics and Applications
- Nuclear Materials and Properties
- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Fault Detection and Control Systems
- Atomic and Subatomic Physics Research
- Advanced Battery Materials and Technologies
- Astro and Planetary Science
- Ion-surface interactions and analysis
- X-ray Spectroscopy and Fluorescence Analysis
- Lung Cancer Treatments and Mutations
- Glioma Diagnosis and Treatment
- Geophysics and Gravity Measurements
- Sugarcane Cultivation and Processing
- Remote Sensing and Land Use
- Silicon Carbide Semiconductor Technologies
Max Planck Institute for Plasma Physics
2016-2025
Max Planck Society
2012-2021
Murdoch University
2021
Heidelberg University
1972-2020
Kirchhoff (Germany)
2017-2020
SUNY Polytechnic Institute
2018
University of California, Los Angeles
2015
European Steel Association
2015
Culham Science Centre
2011
Industrial Light & Magic (United Kingdom)
2009
Operation of DEMO in comparison to ITER will be significantly more demanding, as various additional limitations physical and technical nature have respected. In particular a set extremely restrictive boundary conditions on divertor operation during between ELMs It is high importance describe these order consider them early possible the ongoing development concept design. This paper extrapolates existing physics basis power particle exhaust DEMO.
Abstract The JET hybrid scenario has been developed from low plasma current carbon wall discharges to the record-breaking Deuterium-Tritium plasmas obtained in 2021 with ITER-like Be/W wall. development started pure Deuterium refinement of current, and toroidal magnetic field choices succeeded solving heat load challenges arising 37 MW injected power ITER like environment, keeping radiation edge core controlled, avoiding MHD instabilities reaching high neutron rates. have re-run Tritium...
A combined treatment program consisting of chemotherapy with cisplatin and infusion 5-fluorouracil (5-FU) for three cycles followed by esophagectomy or radiation, both, has been conducted in 26 patients squamous cancer the esophagus localized to primary site. Eleven had objective evidence partial complete response chemotherapy. Fourteen were operated on ten underwent total esophagectomy. Drug toxicity was considerable severe mucositis myelosuppression occurring 11 seven patients,...
The newly installed electron cyclotron emission imaging diagnostic on ASDEX Upgrade provides measurements of the 2D temperature dynamics with high spatial and temporal resolution. An overview technical experimental properties system is presented. These are illustrated by edge localized mode reversed shear Alfvén eigenmode, showing both advantage having a two-dimensional (2D) measurement, as well some limitations measurements. Furthermore, application singular value decomposition powerful...
In both JET and ASDEX Upgrade (AUG) the plasma energy confinement has been affected by presence of a metal wall requirement increased gas-fuelling to avoid tungsten pollution plasma.In with beryllium/tungsten high triangularity baseline H-mode scenario (i.e.similar ITER reference scenario) strongest benefit shaping give good normalised H 98 ~1 at Greenwald density fraction f GW ~0.8 disappeared.In AUG full could be achieved in plasmas, albeit elevated pressure β N >2.The lost respect carbon...
In ASDEX Upgrade the compatibility of improved H-modes with an all-W wall has been demonstrated. Under boronized conditions light impurities and radiated power fraction in divertor were reduced, requiring N seeding to cool plasma. The impurity does not only protect tiles but also considerably improves performance H-mode discharges by up 25%. energy confinement increases H 98 -factors 1.3 thereby exceeds best values carbon-dominated AUG at same density collisionality. This improvement is due...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation M. N. A. Beurskens, T. H. Osborne, P. Schneider, E. Wolfrum, L. Frassinetti, R. Groebner, Lomas, I. Nunes, S. Saarelma, Scannell, B. Snyder, D. Zarzoso, Balboa, Bray, Brix, J. Flanagan, C. Giroud, Giovannozzi, Kempenaars, Loarte, de la Luna, G. Maddison, F. Maggi, McDonald, Pasqualotto, Saibene, Sartori, Emilia...
FIDASIM is a code that models signals produced by charge-exchange reactions between neutrals and ions (both fast thermal) in magnetically confined plasmas. With the ion distribution function as input, predicts efflux to neutral particle analyzer diagnostic photon radiance of Balmer-alpha light fast-ion D diagnostic, addition many other related quantities. A new, parallelized version Monte Carlo has been developed Fortran90 substantially faster than original interactive data language version....
Abstract In ASDEX Upgrade (AUG), the normalised gyroradius <?CDATA ${{\rho}_{\star}}$ ?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mstyle displaystyle="false"> <mml:mrow> <mml:msub> <mml:mi>ρ</mml:mi> </mml:mrow> <mml:mo>⋆</mml:mo> </mml:msub> </mml:mstyle> </mml:math> was varied via a hydrogen isotope scan while keeping other dimensionless parameters constant. This done in L-mode, to minimise impact of pedestal stability on confinement. Power balance...
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....
The design of future fusion reactors and their operational scenarios requires an accurate prediction the plasma confinement. We have developed a new model that integrates different elements describing main physics phenomena which determine In particular, we are coupling pedestal transport model, based on empirical observations, to ASTRA code, which, together with TGLF turbulent NCLASS neoclassical allows us describe from magnetic axis separatrix. also coupled simple scrape-off layer ASTRA,...
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.
Abstract The work describes the pedestal structure, transport and stability in an effective mass ( A eff ) scan from pure deuterium to tritium plasmas using a type I ELMy H-mode dataset which key parameters that affect behaviour (normalized pressure, ratio of separatrix density density, ion Larmor radius, collisionality rotation) are kept as constant possible. Experimental results show significant increase at top with increasing , modest reduction temperature pressure. variations heights...
Abstract As part the DTE2 campaign in JET tokamak, we conducted a parameter scan T and D-T complementing existing pulses H D. For different main ion masses, type-I ELMy H-modes at fixed plasma current magnetic field can have pedestal pressure varying by factor of 4 total changing from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>β</mml:mi> <mml:mrow> <mml:mi mathvariant="normal">N</mml:mi> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo>...
Abstract An imaging neutral particle analyser (INPA) diagnostic has been installed and commissioned at the ASDEX Upgrade (AUG) tokamak. The AUG INPA provides energy radially resolved measurements of fast-ion (FI) distribution, complementing existing set which measure confined FI population. To this end, it analyses charge exchange (CX) neutrals produced in reactions between injected by a beam injector. These CX are ionised 20 nm carbon foil deflected towards scintillator machine magnetic...
Abstract The nature of the turbulent transport in edge region ASDEX Upgrade and JET-ILW deuterium (D) hydrogen (H) L-mode plasmas is studied using local gyro-kinetic simulations. For both devices turbulence found to be dominated by an electron drift-wave destabilized high collisionality plasma strongly related kinetic dynamics. isotope ion mass have important impact on turbulence. In linear simulations, wider eigenfunctions electrostatic potential with a lower translate threshold normalized...
A stationary H-mode without edge localized modes (ELMs) has been recently achieved in the ASDEX Upgrade tokamak by applying central electron cyclotron resonance heating above L-H power threshold with adequate fueling. It is naturally obtained favorable ∇B configuration and several features which are desirable for future reactors, such as dominant heating, low input torque, possibility of access at power, good energy confinement (), high density no impurity accumulation despite absence ELMs....
Alfvén waves are electromagnetic perturbations inherent to magnetized plasmas that can be driven unstable by a free energy associated with gradients in the energetic particles' distribution function. The particles velocities comparable velocity may excite instabilities via resonant wave–particle and momentum exchange. Burning large population of fusion born super-Alfvénic alpha magnetically confined devices prone weakly-damped eigenmodes (AEs) that, if allowed grow unabated, cause...
Abstract In this paper we demonstrate how the inversion, in energy and major radius (E, R) coordinates, of imaging neutral particle analyser (INPA) measurements can be used to obtain fast-ion distribution. The INPA is most sensitive passing ions with energies range (20–150) keV pitches near 0.5 core 0.7 plasma edge. Inversion synthetic signals, via 0th-order Tikhonov Elastic Net regularization, were performed capability recovering ground truth 2D phase-space distribution resolved energy,...
Abstract JET returned to deuterium-tritium operations in 2023 (DTE3 campaign), approximately two years after DTE2. DTE3 was designed as an extension of JET's 2022-2023 deuterium campaigns, which focused on developing scenarios for ITER and DEMO, integrating in-depth physics understanding control schemes. These were evaluated with mixed D-T fuel, using the only remaining tritium-capable tokamak until its closure 2023. A core-edge-SOL integrated H-mode scenario developed tested D-T, showing...
A pedestal database was built using data from type-I ELMy H-modes of ASDEX Upgrade, DIII-D and JET. ELM synchronized were analysed with the two-line method. The method is a bilinear fit which shows better reproducibility parameters than modified hyperbolic tangent fit. This tested simulated experimental data. influence equilibrium reconstruction on investigated sophisticated reconstructions CLISTE EFIT including edge kinetic profiles. No systematic deviation between codes could be observed....
Recent experiments at ASDEX Upgrade demonstrate the compatibility of ELM mitigation by magnetic perturbations with efficient particle fuelling inboard pellet injection. persists in a high-density, high-collisionality regime even strongest applied perturbations. Pellets injected into phases trigger no type-I ELM-like events unlike when launched unmitigated ELMy plasmas. Furthermore, absence ELMs results improved efficiency and persistent density build-up. Pellet injection is helpful to access...
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....
The neutral beam current drive efficiency has been investigated in the ASDEX Upgrade tokamak by replacing on-axis beams with tangential off-axis beams.A clear modification of radial fast-ion profiles is observed a Dalpha diagnostic that measures centrally peaked during injection and outwards shifted injection.Due to this change population, plasma profile predicted but not motional Stark effect diagnostic.The transport caused MHD activity studied low collisionality discharges exhibit strong...