A5031692533- Magnetic confinement fusion research
- Fusion materials and technologies
- Geological and Geochemical Analysis
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- earthquake and tectonic studies
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- High-pressure geophysics and materials
- Nuclear reactor physics and engineering
- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Geologic Mapping
- Atomic and Molecular Physics
- Geological Studies and Exploration
- Laser-induced spectroscopy and plasma
- Geological and Geophysical Studies
- Geological and Tectonic Studies in Latin America
- Geological Modeling and Analysis
- Metallurgical Processes and Thermodynamics
- Structural Analysis and Optimization
- Nuclear Engineering Thermal-Hydraulics
- Textile materials and evaluations
Culham Science Centre
2006-2024
Ruhr University Bochum
1998-2024
Max Planck Institute for Plasma Physics
2015
Max Planck Society
2015
Culham Centre for Fusion Energy
2006-2014
Forschungszentrum Jülich
2000-2013
Aalto University
2012
École Polytechnique Fédérale de Lausanne
2012
Queen's University Belfast
2009
Disruption mitigation is mandatory for ITER in order to reduce forces, mitigate heat loads during the thermal quench and avoid runaway electrons (REs). A fast disruption valve has been installed at JET study by massive gas injection. Different species amounts have investigated with respect timescales efficiency. We discuss of halo currents as well sideways forces vertical displacement events, increased energy dissipation through radiation, which could arise asymmetric radiation suppression REs.
Drilling has revealed suites of magnesian granite and diorite emplaced in Early Jurassic time (198–195 Ma) an arc-related low-temperature (678 to 696°C) magmatism NE South China Sea. These rocks have 87Sr/86Sri (0.705494 0.706623) εNdt (−0.9 +2.2) as evidence evolved mantle-derived magmas, coupled with enriched fluid-mobile elements Cs K Pb implying involvement subduction-zone fluids. Another granodiorite (zircon U-Pb 187 drilled from the SW East Sea, a high-K calc alkaline, is comparably...
Research Article| March 01, 1998 Thermochronology of the high-pressure metamorphic rocks Crete, Greece: Implications for speed tectonic processes Stuart N. Thomson; Thomson 1Institut für Geologie, Ruhr-Universität Bochum, D-44780 Germany Search other works by this author on: GSW Google Scholar Bernhard Stöckhert; Stöckhert Manfred R. Brix Author and Article Information Publisher: Geological Society America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print 0091-7613 Geology (1998) 26...
Results from the first measurements of a core plasma poloidal rotation velocity (upsilontheta) across internal transport barriers (ITB) on JET are presented. The spatial and temporal evolution ITB can be followed along with upsilontheta radial profiles, providing very clear link between location steepest region ion temperature gradient localized spin-up upsilontheta. an order magnitude higher than neoclassical predictions for thermal particles in region, contrary to close agreement found...
Abstract This paper reports the first experiment carried out in deuterium–tritium addressing integration of a radiative divertor for heat-load control with good confinement. Neon seeding was time D–T plasma as part second campaign JET its Be/W wall environment. The technical difficulties linked to re-ionisation heat load are reported T and D–T. compares impact neon on plasmas their D counterpart detachment, localisation radiation, scrape-off profiles, pedestal structure, edge localised modes global
Abstract The pre-Neogene thrust sheets of Crete, Greece, accreted during Oligocene and Early Miocene time, can be divided into two main groups juxtaposed by a extensional detachment. Oligo-Miocene high pressure-low temperature (HP-LT) metamorphic rocks crop out in the lower plate to detachment, that show no evidence Tertiary metamorphism upper plate. Detailed pressure, structural information from HP-LT combined with new fission-track data reveal were subducted, then pervasively deformed...
The radiative improved (RI) mode is a tokamak regime offering many attractive reactor features. In the article, RI of TEXTOR-94 shown to follow same scaling as linear ohmic confinement and thus identified one most fundamental operational regimes. current understanding derived from experiments modelling conditions necessary for sustaining reviewed, are mechanisms leading L-RI transition. article discusses compatibility high impurity seeding with low central power density burning reactor, well...
An overview of the results obtained so far for radiative I-mode regime on upgraded Torus Experiment Technology Oriented Research (TEXTOR-94) [Proceedings 16th IEEE Symposium Fusion Engineering (Institute Electrical and Electronics Engineers, Piscataway, NJ, 1995), Vol. 1, p. 470] is given. This under quasistationary conditions with edge neon seeding in a pumped limiter tokamak circular cross section. It combines high confinement β (up to normalized beta, βn=2) low q values (down qa=2.8)...
One of the most severe problems for fusion reactors is power load on plasma facing components. The challenge to develop operation scenarios, which combine sufficient energy confinement with benign heat loads radiative type-III ELMy H-mode seems a possible solution such an integrated ITER scenario. Nitrogen seeded H-modes standard inductive scenario and high beta stationary hybrid are investigated respect their transient steady-state fluxes divertor, properties, edge operational space, core...
The former all-carbon wall on JET has been replaced with beryllium in the main torus and tungsten divertor to mimic surface materials envisaged for ITER. Comparisons are presented between type I H-mode characteristics each design by examining respective scans over deuterium fuelling impurity seeding, required ameliorate exhaust loads both at full capability Attention is focused upon a common high-triangularity, single-null configuration 2.5 MA, q95 ≈ 3.5 yielding most robust all-C...
Recent progress towards obtaining high density and confinement in JET as required for the ITER reference scenario at Q = 10 is summarized. Plasmas with simultaneous H98(y,2) 1 densities up to n/nGW~1 are now routinely obtained. This has been possible (i) by using plasmas (δ~0.5) medium (δ~0.3-0.4) triangularity sufficient heating power maintain Type I ELMs, (ii) impurity seeded low (δ⩽0.2) triangularity, (iii) an optimized pellet injection sequence, maintaining energy raising density, (iv)...
High-Z materials as tungsten are intended to be used in future fusion reactors due their low sputtering rates and high melting points. In this context the important question is whether use of high-Z compatible with concept a cold radiative boundary. To investigate local release transport behaviour impurities, Mo W test limiters were auxiliary heated discharges under different radiation scenarios neon seeding. addition, laser blow-off well xenon gas puffing performed. some particular...
An overview is given of recent advances toward the realization high density, confinement plasmas with radiating mantles in limiter and divertor tokamaks worldwide. Radiatively improved mode discharges on Torus Experiment for Technology Oriented Research 94 (TEXTOR-94) [Proceedings 16th IEEE Symposium Fusion Engineering, 1995 (Institute Electrical Electronics Engineers, Piscataway, NJ, 1995), p. 470] have recently been obtained at trans-Greenwald densities (up to n̄/nGW=1.4) free edge...
ELMy H-mode experiments at JET in 2000/mid-2002 have focused on discharges with normalized parameters for plasma density, energy confinement and beta similar to those of the ITER QDT = 10 reference regime (n/nGW ∼ 0.85, H98(y,2) 1, βN 1.8). plasmas been realized reaching or even exceeding steady-state conditions (up 5 s 12 τE) a reproducible way only limited by duration additional heating phase. These results obtained (a) highly triangular plasmas, increasing average triangularity δ towards...
Scaling to larger tokamaks of high confinement plasmas with radiating edges, induced by impurities, is being studied through internationally collaborative experiments on JET. In campaigns till the end 2000, three different regimes have been explored. A small number limiter L-mode discharges seeded neon most closely repeated approach used TEXTOR-94, but collisionality and particle transport in JET impede central peaking density associated improved confinement. Divertor L-modes at intermediate...
Abstract The western Lower Saxony Basin is characterized by magnetic and gravity anomalies an unusually strong coalification of surface‐near sedimentary rocks, indicating that high temperatures were reached in the past. temperature history basin has been disputed for many years leading basically to two different hypotheses: one proposes igneous intrusion during Mid Cretaceous time, causing maturity this area, whereas other theory explained as a result deep burial late Jurassic early times....
Research Article| September 01, 1995 Crustal history of Margarita Island (Venezuela) in detail: Constraint on the Caribbean plate-tectonic scenario Bernhard Stöckhert; Stöckhert 1Institut für Geologie, Ruhr-Universität Bochum, Postfach 102148, D-44721 Germany Search for other works by this author on: GSW Google Scholar Walter V. Maresch; Maresch 2Institut Mineralogie, Universität Münster, Corrensstrasse 24, D-48149 Manfred Brix; Brix Claudia Kaiser; Kaiser Andreas Toetz; Toetz Rolf Kluge;...