A5065852991- Magnetic confinement fusion research
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Atomic and Molecular Physics
- Laser-Matter Interactions and Applications
- Superconducting Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Gas Dynamics and Kinetic Theory
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Laser-induced spectroscopy and plasma
- Solar and Space Plasma Dynamics
- Electromagnetic Launch and Propulsion Technology
- Mass Spectrometry Techniques and Applications
- Advanced Fiber Laser Technologies
- Spacecraft and Cryogenic Technologies
- Magnetic Bearings and Levitation Dynamics
- Particle physics theoretical and experimental studies
- Laser Design and Applications
- Plasma Diagnostics and Applications
- Nuclear Physics and Applications
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Cyclone Separators and Fluid Dynamics
University of Szczecin
2011-2023
Institute of Physics
2013-2023
Max Planck Institute for Plasma Physics
2019
Max Planck Society
2019
Czech Academy of Sciences, Institute of Physics
2013
Abstract Wendelstein 7-X (W7-X), the largest advanced stellarator, is built to demonstrate high power, performance quasi-continuous operation. Therefore, in recent campaign, experiments were performed prepare for long pulse operation, addressing three critical issues: development of stable detachment, control heat and particle exhaust, impact leading edges on plasma performance. The exhaust W7-X realized with help an island divertor, which utilizes large magnetic islands at boundary. This...
The Wendelstein 7-X (W7-X) optimized stellarator fusion experiment, which went into operation in 2015, has been operating since 2017 with an un-cooled modular graphite divertor. This allowed first divertor physics studies to be performed at pulse energies up 80 MJ, as opposed 4 MJ the phase, where five inboard limiters were installed instead of a This, and number other upgrades device capabilities, extension regimes higher plasma density, heating power, performance overall, e.g. setting new...
The low-Z oxygen and carbon were the main plasma impurities in Wendelstein 7-X (W7-X) stellarator last experimental campaign with passively cooled graphite divertor. To tackle this issue boronization (Winter et al 1989 J. Nucl. Mater. 162–4 712–23) was applied, which has led to one of achievements campaign: operation at high core densities more than 1020 m−3 hydrogen fueled plasmas due reduced radiation-induced density limit.
The first fast ion experiments in Wendelstein 7-X were performed 2018. They are one of the steps demonstrating optimised confinement stellarator. ions produced with a neutral beam injection (NBI) system and detected infrared cameras (IR), loss detector (FILD), charge exchange spectroscopy (FIDA), post-mortem analysis plasma facing components. distribution function at wall is being modelled ASCOT suite codes. calculate ionisation injected neutrals consecutive slowing down process ions....
Long pulse operation of present and future magnetic fusion devices requires sophisticated methods for protection plasma facing components from overheating. Typically, thermographic systems are being used to fulfill this task. Steady state requires, however, autonomous the system fully automatic detection abnormal events. At Wendelstein 7-X (W7-X), a large advanced stellarator, which aims at demonstrating capabilities stellarator line as power plant, significant efforts undertaken develop...
The first neutral beam injection (NBI) experiments in Wendelstein 7-X (W7-X) stellarator were conducted the summer of 2018. NBI system is used to heat magnetically confined plasma by neutralising an accelerated hydrogen ion and directing it into plasma, where resulting energetic ions release their energy plasma. modelling fast has commenced, including estimation shine-through orbit-losses. a wide-angle infra red (IR) imaging monitor machine facing component surface temperatures. This work...
One of the main aims Wendelstein 7-X (W7-X), an advanced stellarator, is to investigate quasi-steady state operation magnetic confinement devices for nuclear fusion, which power exhaust important issue. A dominant fraction energy leaving from confined plasma region will be removed by 10 so-called island divertor units, are designed sustain a maximum heat flux up MWm−2. An essential prerequisite safe steady-state device automatic detection hot spots and other abnormal events. Simple...
We analyze energy spectra of photoelectrons ejected by strong laser pulses, using the manifestly gauge-invariant approach. Gauge-invariant expressions for ionization amplitude can be obtained grouping together all terms same order in atomic potential standard strong-field approximation (SFA) expansion. calculate hydrogen atom, and compare them with results based on numerical solutions time-dependent Schr\"odinger equation. Agreement, at least qualitative, is observed an electric-field higher...
We present recent results of our studies on the matter interaction with strong laser pulses. It has been known that obtained use Strong Field Approximation which underlay Keldysh-Faissal-Reiss theory (KFR), leads to gauge dependent expression for probability amplitude. propose new approach this problem and develop method obtain are independent. examples numerical calculations show good agreement model TDSE results. Full Text: PDF References L.V. Keldysh, "Diagram Technique Nonequilibrium...
Abstract Modelling of the plasma transport for inherently three-dimensional (3D) problems as in stellarators requires dedicated complex codes. FINDIF is a 3D multifluid edge code that has been previously successfully used analysis energy TEXTOR-DED tokamak [1], where perturbations led to an ergodic structure field lines edge. The ongoing efforts apply it meaningfully Wendelstein 7-X (W7-X) resulted advancements main model and accompanying tools mesh generation post-processing. In order...
It is shown that strong field approximation (SFA) can be formulated in a gauge invariant manner order by of the expansion with no need for various partitions Hamiltonian different gauges.
Ionization of atomic systems by strong and short laser pulses is considered in a new gauge invariant version the Strong Field Approximation (SFA). The standard SFA (SSFA), which usually applied to theoretical description interaction with fields, dependent on choice vector potential describing radiation. Theoretical predictions SSFA may differ significantly depending gauge. In particular, substantial differences have been observed case two most frequently used length velocity gauges. Gauge...