M. Jakubowski
A5059013759- Magnetic confinement fusion research
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Solar and Space Plasma Dynamics
- Particle accelerators and beam dynamics
- Nuclear reactor physics and engineering
- Laser-induced spectroscopy and plasma
- Heavy Metal Exposure and Toxicity
- Nuclear Physics and Applications
- Carcinogens and Genotoxicity Assessment
- Atomic and Molecular Physics
- Air Quality and Health Impacts
- Fluid Dynamics and Turbulent Flows
- Astro and Planetary Science
- Gas Dynamics and Kinetic Theory
- Fatigue and fracture mechanics
- Quantum chaos and dynamical systems
- Spacecraft and Cryogenic Technologies
- Atomic and Subatomic Physics Research
- Calibration and Measurement Techniques
- Astronomical Observations and Instrumentation
- Nuclear Engineering Thermal-Hydraulics
Max Planck Institute for Plasma Physics - Greifswald
2016-2025
Max Planck Institute for Plasma Physics
2013-2023
Max Planck Society
2012-2021
Institute of Physics
2004-2020
University of Szczecin
2017-2020
Nofer Institute of Occupational Medicine
2006-2019
Gdańsk University of Technology
1998-2017
Lublin University of Technology
2013-2017
University of Opole
2004-2016
University of Wisconsin–Madison
1999-2016
Large Type-I edge localized modes (ELMs) are completely eliminated with small n = 3 resonant magnetic perturbations (RMP) in low average triangularity, , plasmas and ITER similar shaped (ISS) plasmas, relevant collisionalities . Significant differences the RMP requirements properties of ELM suppressed found when comparing two triangularities. In ISS current required to suppress ELMs is approximately 25% higher than triangularity plasmas. It also that width q95 window for suppression smaller...
Abstract Progress in physics understanding and theoretical model development of plasma transport confinement (TC) the ITPA TC Topical Group since publication ITER Physics Basis (IPB) document (Doyle et al 2007 Nucl. Fusion 47 S18) was summarized focusing on contributions to burning prediction control. This paper provides a general streamlined overview advances that were mainly led by joint experiments activities for last 15 years (see JEX/JA table appendix). starts with scientific strategy...
Lead, cadmium, mercury, and arsenic are common environmental pollutants in industrialized countries, but their combined impact on children's health is little known. We studied effects two main targets, the renal dopaminergic systems, > 800 children during a cross-sectional European survey. Control exposed were recruited from those living around historical nonferrous smelters France, Czech Republic, Poland. Children provided blood urine samples for determination of metals sensitive or...
Light detection and ranging (lidar) data is increasingly being used for ecosystem monitoring across geographic scales. This work concentrates on delineating individual trees in topographically-complex, mixed conifer forest the California’s Sierra Nevada. We delineated using vector a 3D lidar point cloud segmentation algorithm, raster with an object-based image analysis (OBIA) of canopy height model (CHM). The two approaches are compared to each other ground reference data. high density (9...
For Europe as a whole, data on internal exposure to environmental chemicals do not yet exist. Characterization of the individual chemical environment is expected enhance understanding threats health.We developed and applied harmonized protocol collect comparable human biomonitoring all over Europe.In 17 European countries, we measured mercury in hair cotinine, phthalate metabolites, cadmium urine 1,844 children (5-11 years age) their mothers. Specimens were collected 5-month period...
After completing the main construction phase of Wendelstein 7-X (W7-X) and successfully commissioning device, first plasma operation started at end 2015. Integral start-up using electron cyclotron resonance heating (ECRH) an extensive set diagnostics have been completed, allowing initial physics studies during operational campaign. Both in helium hydrogen, breakdown was easily achieved. Gaining experience with vessel conditioning, discharge lengths could be extended gradually. Eventually,...
In this paper the manipulation of power deposition on divertor targets at DIII-D by application resonant magnetic perturbations (RMPs) for suppression large type-I edge localized modes (ELMs) is analysed. We discuss modification ELM characteristics RMP applied. It shown that width pattern in ELMy H-mode depends linearly deposited energy, whereas phase discharge those patterns are controlled externally induced perturbation. was also found heat transport due to small, plasma pedestal electron...
Recent DIII-D [J. L. Luxon et al., Nucl. Fusion 43, 1813 (2003)] experiments show a correlation between the extent of overlap magnetic islands induced in edge plasma by perturbation coils and complete suppression Type-I localized modes (ELMs) plasmas with ITER-like electron pedestal collisionality νe*∼0.1, flux surface shape low safety factor (q95≈3.6). With fixed amplitude n=3 resonant (RMP), ELM is obtained only finite window (q95) consistent maximizing component applied helical field....
Wendelstein 7-X is the first comprehensively optimized stellarator aiming at good confinement with plasma parameters relevant to a future power plant. Plasma operation started in 2015 using limiter configuration. After installing an uncooled magnetic island divertor, extending energy limit from 4 80 MJ, continued 2017. For this phase, electron cyclotron resonance heating (ECRH) capability was extended 7 MW, and hydrogen pellet injection implemented. The enhancements resulted highest triple...
Wendelstein 7-X is a highly optimized stellarator that went into operation in 2015. With 30 cubic meter volume, superconducting coil system operating at 2.5 T, and steady-state heating capability of eventually up to 10 MW, it was built demonstrate the benefits stellarators parameters approaching those fusion power plant. We report here on first results with test divertor installed, during second phase, which performed half 2017. Operation divertor, addition several new fueling systems,...
Abstract Since the publication of review Progress in ITER Physics Basis (PIPB) 2007, significant progress has been made understanding processes at plasma-material interface. This review, part ITPA Nuclear Fusion Special Issue On Path to Burning Plasma Operation , presents these developments, focusing on key areas such as physics plasma exhaust, interactions, and properties plasma-facing materials their evolution under exposure. The coordinated efforts Topical Group Scrape-Off Layer Divertor...
A beam emission spectroscopy system has been installed on DIII-D to provide localized density fluctuation measurements for long-wavelength turbulent modes with k⩽3 cm−1 which are typically associated anomalous radial transport. High signal-to-noise fluctuations accomplished through use of high speed electronics maintain a frequency response over 500 KHz and cryogenically cooled amplifiers detectors reduce electronic noise. The optics neutral beam-sightline geometry have optimized allow...
The application of time-delay-estimation techniques to two-dimensional measurements density fluctuations, obtained with beam emission spectroscopy in DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] plasmas, has provided temporally and spatially resolved the turbulence flow-field. Features that are characteristic self-generated zonal flows observed radial region 0.85⩽r/a⩽1.0. These features include a coherent oscillation (approximately 15 kHz) poloidal flow fluctuations long wavelength,...
The generation of runaway electrons in the international fusion experiment ITER disruptions can lead to severe damage at plasma facing components. Massive gas injection might inhibit process, but amount needed affect, e.g., vacuum systems. Alternatively, magnetic perturbations suppress by increasing loss rate. In TEXTOR losses were enhanced application resonant with toroidal mode number n=1 and n=2. are initiated fast about 3x10{21} argon atoms, which leads a reliable electrons. At...
A study of three-dimensional (3D) perturbed magnetic field structures and transport for edge localized mode control experiments with resonant perturbations at DIII-D is presented. We focus on ITER-Similar Shape plasmas ITER relevant electron pedestal collisionalities . This performed in comparison results from TEXTOR-Dynamic Ergodic Divertor circular limiter plasmas. For both the structure analyzed vacuum paradigm—superimposing external RMP unperturbed equilibrium. TEXTOR L-mode this...
The metal cadmium (Cd) is a widespread environmental pollutant with documented adverse effects on the kidneys and bones from long-term exposure, but insufficiently elucidated public health consequences such as risk of cardiovascular disease, hormone-related cancer in adults developmental children. This study first pan-European human biomonitoring project that succeeded performing harmonized measurements Cd urine comparable way mother-child couples 16 European countries. aim was to evaluate...
Wendelstein 7-X (W7-X) is currently under commissioning in preparation for its initial plasma operation phase, phase 1.1 (OP1.1). This first serves primarily to provide an integral of all major systems needed operation, as well systems, such diagnostics, that need verify their foreseen functions. In OP1.1, W7-X will have a reduced set in-vessel components. particular, five graphite limiter stripes replace the later divertor. paper describes expected machine capabilities selection physics...
Wendelstein 7-X aims at quasi-steady state operation with up to 10 MW of heating power for 30 min. Power exhaust will be handled predominantly via actively water cooled CFC (carbon-fiber-reinforced carbon) based divertor units designed withstand loads MW/m2 locally in steady state. If local exceed this value, a risk delamination the and failure entire modules arises. Infrared endoscopes monitor all main plasma facing components are being prepared, near real time software tools under...
Abstract The fundamental behavior of the W7-X island divertor under detached conditions, which has been theoretically predicted with EMC3-Eirene code, is re-examined here experimental conditions achieved so far and compared first results. Both simulations experiments cover a range configurations plasma parameters, show following common trends: (1) rising impurity radiation, target heat load decreases ‘uniformly’ over entire surface in sense that both peak average loads can drop by an order...
The neoclassical transport optimization of the Wendelstein 7-X stellarator has not resulted in predicted high energy confinement gas fueled electron-cyclotron-resonance-heated (ECRH) plasmas as modelled (Turkin et al 2011 Phys. Plasmas 18 022505) due to levels turbulent heat observed experiments. electron-turbulent-heat appears non-stiff and is electron temperature gradient (ETG)/ion (ITG) type (Weir 2021 Nucl. Fusion 61 056001). As a result, Te can be varied freely from 1 keV–10 keV within...
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...
Time-resolved measurements of the turbulent density flow field in a tokamak plasma reveal low-frequency ( approximately 15 KHz), coherent oscillations poloidal flow, v(theta). These have long wavelength (m<3) and narrow radial extent (k(r)rho(i) 0.2). The estimated flow-shearing rate is same order magnitude as turbulence decorrelation may thus regulate amplitude. features are consistent with theoretically predicted axisymmetric, self-regulating, sheared flows recognized geodesic acoustic modes.
The magnetic-field perturbation produced by the dynamic ergodic divertor in TEXTOR changes topology of magnetic field plasma edge, creating an open chaotic system. spectrum contains only a few dominant harmonics and therefore it can be described analytical model. modeling is performed vacuum approximation without assuming backreaction does not rely on any experimentally obtained parameters. It shown that this predicts many details observed structure. Several experiments have been to prove...