A5037188910- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Physics of Superconductivity and Magnetism
- Particle accelerators and beam dynamics
- Superconductivity in MgB2 and Alloys
- HVDC Systems and Fault Protection
- Spacecraft and Cryogenic Technologies
- Fusion materials and technologies
- Frequency Control in Power Systems
- Thermal Analysis in Power Transmission
- Magnetic Properties and Applications
- Particle Accelerators and Free-Electron Lasers
- Nuclear reactor physics and engineering
- Ionosphere and magnetosphere dynamics
- Electromagnetic Launch and Propulsion Technology
- Magnetic Properties of Alloys
- Electric Motor Design and Analysis
- Characterization and Applications of Magnetic Nanoparticles
- High voltage insulation and dielectric phenomena
- Graphite, nuclear technology, radiation studies
- Magnetic Field Sensors Techniques
- Railway Systems and Energy Efficiency
- Photovoltaic System Optimization Techniques
- Advanced Thermodynamic Systems and Engines
- Elasticity and Material Modeling
Karlsruhe Institute of Technology
2013-2022
École Polytechnique Fédérale de Lausanne
2021
FIZ Karlsruhe – Leibniz Institute for Information Infrastructure
2005-2009
FZI Research Center for Information Technology
2000-2009
Institut für Technische und Angewandte Physik (Germany)
1998
Max Planck Institute for Plasma Physics
1997
Deutsches Elektronen-Synchrotron DESY
1988
RBCO (R = Y or rare earth element) coated conductors (CC) are the most promising HTS materials for future high field coils operated at moderately temperature (40-50 K). Coils planned second generation of fusion reactors (DEMO, "DEMOnstrator") and beyond. A ROEBEL bar concept a current (kA-class) low AC loss cable is suitable assembling technique in magnet windings due to flat rectangular cross section. The presented RACC-cable (RACC=ROEBEL assembled conductors) works with pre-shaping tapes...
In order to build high-current cables from second-generation high-temperature superconductor (HTS) rare-earth barium-copper-oxide (REBCO) tapes, numerous approaches were studied, such as conductor on round core, Roebel cable, and several versions of twisted stacked-tape cable types. Based the work Takayasu et al. Uglietti al., we developed tested a modified type stacked HTS tape arrangement optimized for high engineering critical current density. Key aspects implementation simple reliable...
Assembling coated conductors (CC) into flat ROEBEL bars (RACC cable) was introduced in 2005 by the authors as a practicable method of reaching high transport currents low AC loss cable, which is cable design suited for application windings. The current 1.02 kA self-field at 77 K achieved so far, however, still too several applications electrical machinery such larger transformers and generators/motors. A new concept further increased presented just recently. goal primarily to demonstrate...
Second-generation high-temperature superconductors (HTS) REBCO are promising for high-field application due to the excellent J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> (B) performance at low temperatures and power transmission liquid nitrogen temperature. For with HTS, formation of high-current HTS cables from single tapes is desirable cable currents several 10 kA up more than 100 kA. On other hand, avoid high inductances, which...
We present the pre-concept design of European DEMO Magnet System, which has successfully passed plant-level gate review in 2020. The main input parameters originate from so-called 2018 baseline, was produced using PROCESS systems code. It defines a major and minor radius 9.1 m 2.9 m, respectively, an on-axis magnetic field 5.3 T resulting peak on toroidal (TF) conductor 12.0 T. Four variants, all based low-temperature superconductors (LTS), have been designed for 16 TF coils. Two these...
The DEMO reactor is expected to be the first application of fusion for electricity generation in near future. To this aim, conceptual design activities are progressing Europe (EU) under lead EUROfusion Consortium order drive on development major tokamak systems. In 2014, carried out by magnet system project team were focused toroidal field (TF) and demonstrated achievements terms concept proposals consolidated evaluations against criteria. Several R&D conducted parallel, together with broad...
The European DEMO, i.e. the demonstration fusion power plant designed in framework of Roadmap to Fusion Electricity by EUROfusion Consortium, is approaching end pre-conceptual design phase, be accomplished with a Gate Review 2020, which all DEMO subsystems will reviewed panels independent experts. latest 2018 baseline has major and minor radius 9.1 m 2.9 m, plasma current 17.9 MA, toroidal field on axis 5.2 T, peak toroidal-field (TF) conductor 12.0 T. 900 ton heavy TF coil prepared four...
Abstract The HTS current leads for the ITER project will be largest ever operated, with unprecedented currents, up to 68 kA and voltages, 14 kV. According agreement they provided in-kind by China. After an extensive development program at Hefei Institute of Plasma Physics (ASIPP), were designed qualified. following discusses main highlights this development, particular emphasis on description design different types their final qualification in dedicated cold tests nominal conditions.
In the frame of European Fusion Technology Programme, Forschungszentrum Karlsruhe and CRPP Villigen have designed built a 70 kA current lead for ITER TF Coils using High Temperature Superconductors (HTS). At beginning 2004 HTS was installed tested in TOSKA facility Karlsruhe. The scope experiment to characterize steady state conditions explore operation limits as well. For this, temperature profile, contact resistances, heat load at 4.5 K, required 50 K He mass flow rate, margin were...
In the frame of preconceptual design next-generation fusion power plant (EU DEMO), PROCESS systems code is used for nearly 20 years, in which main reactor components (e.g., plasma, blanket, and magnets) are integrated a unique computational algorithm simulated by means rather simplified mathematical models steady-state zero-dimensional models). this paper, boundaries given toroidal field coil (TFC) EU DEMO as starting point TFC winding pack, using high-temperature superconductor (HTS)...
Reliable analyses of thermal–hydraulic (TH) transients are becoming fundamental to supporting the design magnets for fusion applications based on high temperature superconducting (HTS) cable-in-conduit-conductors (CICCs). However, currently available TH codes were developed and validated only analysis wound with low superconductor (LTS) CICCs. In order confirm applicability such tools HTS CICCs, a two-step strategy is presented in this paper. First, qualitative assessment characteristic time...
Forschungszentrum Karlsruhe has taken over the responsibility for design, construction and testing of High Temperature Superconductor (HTS) current leads two fusion experiments, i.e. stellarator WENDELSTEIN 7-X (W7-X) satellite tokamak JT-60SA. W7-X is presently under at Greifswald branch Max-Planck-Institute Plasma Physics consists 50 non-planar 20 planar coils with a maximum conductor 17.6 kA. In total 14 are required nominal kA that mounted upside down warm end bottom. frame Broader...
In the past few years Roebel technique has been established as a method for cabling of coated conductor tapes to achieve high current carrying capabilities low ac-loss applications. We have successfully developed cables consisting up 50 and with 2.6 kA (77 K, self-field). However, applications like busbars or fusion magnets more than 10 are required. Such cannot be reached by simple scale-up additional tapes. present concept Coated Conductor Rutherford Cables (CCRCs) currents exceeding using...
The stellarator fusion experimental device Wendelstein 7-X (W7-X) is presently under assembly at the Greifswald branch of Max-Planck-Institut für Plasmaphysik, Germany. superconducting magnet system consists 50 nonplanar coils, 20 planar a bus system, and 14 current leads. It organized in seven electrical circuits with ten for interconnection, two leads each. cooled by supercritical helium. enclosed cryostat an outer diameter 16 m formed plasma vessel vessel. There are five different types...
The most distinctive feature of the superconducting magnet system for JT-60SA is optimized coil structure in terms space utilization as well highly accurate manufacturing, thus meeting requirements steady-state tokamak research: a conceptually new outer inter-coil separated from casing introduced to toroidal field coils realize their slender shape, allowing large-bore diagnostic ports detailed plasma measurements. A method minimize manufacturing error equilibrium-field has been established,...
Assembling coated conductors (CC) into flat ROEBEL bars (RACC-cable) is a practical method to reach high transport currents in low AC loss cable design which suitable for application windings. Electrical machinery as large transformers and generators/motors need few kA current. The aim of the presented work was demonstrating possibility strong increase current such RACC-cables. So far 1 achieved We present changed with 3-fold layered strands, an unchanged transposition pitch 18.8 cm finally...
The first step of the validation recently developed thermal-hydraulic code 4C is presented. We study transient evolution during a so-called standard 25 kA safety discharge International Thermonuclear Experimental Reactor (ITER) Toroidal Field Model Coil (TFMC), tested in 2001–2002 TOSKA facility at Karlsruhe Institute Technology, Germany. computed outlet He temperatures from both winding and case cooling channels, as well local maximum temperature increase structures, are shown to be good...
Several new conductor designs for fusion applications, based on high temperature superconducting (HTS) materials, have been recently proposed worldwide. Most of them are the twisted-stacked-tape cable (TSTC) idea: a stack HTS tapes is twisted, soldered and embedded in copper tube, constituting what we identify here as 'strand'. Few strands then twisted around central core to make an cable. The finally inserted stainless-steel jacket, which provides mechanical support confinement forced flow...