A5080065972- Magnetic confinement fusion research
- Atomic and Molecular Physics
- Laser-Plasma Interactions and Diagnostics
- Risk and Safety Analysis
- Graphite, nuclear technology, radiation studies
- Particle accelerators and beam dynamics
- Electron and X-Ray Spectroscopy Techniques
- Solar and Space Plasma Dynamics
- Nuclear and radioactivity studies
- Data Quality and Management
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Physics and Applications
- Radioactive contamination and transfer
- Semiconductor materials and interfaces
- Nuclear reactor physics and engineering
- Plasma Diagnostics and Applications
- Advanced Semiconductor Detectors and Materials
- Advanced Text Analysis Techniques
- Laser-induced spectroscopy and plasma
- Fusion materials and technologies
Forschungszentrum Jülich
2014-2023
Max Planck Society
2019
Max Planck Institute for Plasma Physics
2019
GSI Helmholtz Centre for Heavy Ion Research
2003
The investigation of edge plasmas at the stellarator W7-X requires a flexible tool for integration variety different diagnostics as e.g. electrical probes, probing magnetic coils, material collection, or exposition and gas injection. A multi-purpose manipulator (MPM) system has been developed attached to vessel before operational phase 1.1. was designed user facility many diagnostics, which can be mounted on unique interface without breaking vacuum. system, located in equatorial plane,...
This paper reports on the design and performance of recently upgraded X-ray imaging spectrometer systems, crystal high resolution spectrometer, installed at optimized stellarator Wendelstein 7-X. High spectra highly ionized, He-like Si, Ar, Ti, Fe as well H-like Ar have been observed. A cross comparison ion electron temperature profiles derived from a spectral fit tomographic inversion shows reasonable match with both spectrometers. The also measured impurity density peaked densities radial...
We present a detailed overview and first results of the new laser blow-off system on stellarator Wendelstein 7-X. The allows impurity transport studies by repetitive controlled injection different tracer ions into plasma edge. A Nd:YAG is used to ablate thin metal film, coated glass plate, with repetition rate up 20 Hz. remote-controlled adjustable optical variation spot diameter enables positioning non-ablated areas target between pulses. During experiments, clear spectral lines from higher...
This paper reports on the effect of on- and off-axis heating power deposition impurity confinement in purely electron cyclotron resonance heated He plasmas stellarator Wendelstein 7-X. Therefore, transport times τI have been determined after Fe injections by laser ablations monitoring temporal emissivities x-ray imaging spectrometer HR-XIS. A significant increase has observed when changing from to with energy τE being mainly unaffected. In addition, scaling properties respect a variation...
Ion flow velocity measurement in the edge and scraper-off layer region is beneficial to understand confinement related phenomenon fusion devices such as impurity transport plays an important role control. During Wendelstein 7-X (W7-X) operation phase 1.2a, a multi-channel (MC) Mach probe mounted on multi-purpose manipulator has been used measure radial profiles of ion velocity. This MC-Mach consists two polar arrays directional Langmuir pins (28 total) serving for different aims, which could...
Radioactive waste has to undergo a process of quality checking in order check its conformance with national regulations prior transport, intermediate storage and final disposal. Within the radioactive packages non-destructive assays are required characterize their radio-toxic chemo-toxic contents. The Institute Energy Climate Research - Nuclear Waste Management Reactor Safety Forschungszentrum Jülich develops framework cooperation nondestructive analytical techniques for routine...
Development of a robust, thin, hole-blocking (n+) contact on high purity germanium (HPGe) has been the main challenge in development Ge-based radiation sensors. Yttrium reported to be viable HPGe, and detectors with low leakage have fabricated. Niobium also considered as potential due its work function. Here, we investigate interface chemistry Schottky barrier height Y Nb, well electron-blocking contacts Au Pt, Ge(100) surfaces using hard x-ray photoelectron spectroscopy. We find 1.05 ± 0.10...
Segmented and position sensitive germanium detector systems play an important role for future X-ray spectroscopy experiments with highly charged heavy ions. The unique properties of such are millimeter to sub-millimeter spatial resolution as well a good time energy the hard regime above 15 keV. When dealing fast moving ions at accelerators or storage rings, this guarantees suppression Doppler broadening without loss detection efficiency. Another example is combination focusing crystal...