A5049279021- Fusion materials and technologies
- Nuclear Materials and Properties
- Magnetic confinement fusion research
- Metal and Thin Film Mechanics
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Ion-surface interactions and analysis
- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Radiation Effects in Electronics
- Vacuum and Plasma Arcs
- Metal Alloys Wear and Properties
- Advanced materials and composites
- Nuclear reactor physics and engineering
- Cold Fusion and Nuclear Reactions
- Radiation Therapy and Dosimetry
- High-Temperature Coating Behaviors
- Fusion and Plasma Physics Studies
- Public Administration and Political Analysis
- Particle Detector Development and Performance
- Geotechnical Engineering and Soil Stabilization
- EU Law and Policy Analysis
- Mercury impact and mitigation studies
Forschungszentrum Jülich
2013-2023
Culham Science Centre
2021
Culham Centre for Fusion Energy
2021
Royal Military Academy
2020
Japan External Trade Organization
2015
The linear plasma device PSI-2 serves as a pilot experiment for the development of components, operational regimes and control systems JULE-PSI, which will be located in nuclear environment allowing studies radioactive toxic samples. is also used fusion reactor relevant plasma-material interaction studies. This contribution describes layout parameters summarizes recent scientific technical progress project, including installation target station sample manipulation analyses.
The provision of a particle and power exhaust solution which is compatible with first-wall components edge-plasma conditions key area present-day fusion research mandatory for successful operation ITER DEMO. work package plasma-facing (WP PFC) within the European programme complements laboratory experiments, i.e. in linear plasma devices, electron ion beam loading facilities, studies performed toroidally confined magnetic such as JET, ASDEX Upgrade, WEST etc. connection both groups done via...
Cracking thresholds and crack patterns in tungsten targets after repetitive ITER-like edge localized mode (ELM) pulses have been studied recent simulation experiments by laser irradiation. The specimens were tested under selected conditions to quantify the thermal shock response. A Nd:YAG capable of delivering up 32 J energy per pulse with a duration 1 ms at fundamental wavelength λ = 1064 nm has used irradiate ITER-grade samples heat loads. exposures performed for room temperature (RT) as...
Experiments were performed in three different facilities order to investigate the impact of combined steady state deuterium plasma exposure and ELM-like thermal shock events on performance ultra high purity tungsten. The electron beam facility JUDITH 1 was used simulate pure loads. In addition linear devices PSI-2 Pilot-PSI have been for successive as well simultaneous where transient heat loads applied by a energy laser pulsed operation, respectively. results show that damage behaviour...
A physics and engineering analysis of alternative divertor configurations is carried out by examining benefits problems comparing the baseline single null solution with a Snowflake, an X- Super-X divertor. It observed that can provide margin resilience against large power fluctuations, but their has intrinsic difficulties, especially in balance between structural solidity accessibility components when specific poloidal field coil positioning poses further constraints. hybrid proposed as...
• Experiments on tungsten (W) erosion and transport in Argon (Ar) plasma were conducted at the linear device PSI-2. W was measured with three methods: WI spectroscopy, mass loss quartz micro-balance (QMB) deposition sensor. PSI-2 experiments modelled 3D Monte-Carlo code ERO, which have reproduced well all main trends observed. In general, our resulting sputtering yields are consistent SDTrimSP simulations within 50%. Series of independent WΙ Consistent set data produced these interpreted...
The retention of radioactive tritium in the reactor wall is a safety issue and should be kept to minimum. We investigated influence helium, argon, neon nitrogen as plasma impurities on deuterium tungsten linear devices PSI-2 PISCES-A. Following mixed plasmas were produced: pure D, D + He, Ar, Ne, N He with impurity fractions between 3% 10%. Experiments performed at sample temperatures 500 770 K. incident ion energy was 70 eV, above sputtering threshold for argon nitrogen, but below it...
Abstract The interaction between the edge-plasma in a fusion reactor and surrounding first-wall components is one of main issues for realisation energy power plants. EUROfusion Work Package on plasma-facing addresses key areas plasma-surface view ITER DEMO operation, which are mostly related to material erosion, surface damage fuel retention. These aspects both investigated experimentally (in tokamaks, linear plasma devices lab experiments) by modelling. Here, selective results regarding...
The impact on the deuterium retention of simultaneous exposure tungsten to a steady-state plasma and transient cyclic heat loads has been studied in linear PSI-2 facility with main objective qualifying (W) as plasma-facing material. were applied by high-energy laser, Nd:YAG laser (λ = 1064 nm) an energy per pulse up 32 J duration 1 ms. A pronounced increase D factor 13 observed during exposure. These data indicate that hydrogen clustering is enhanced thermal shock exposures, seen increased...
Abstract In order to investigate the effect of neon seeding on deuterium retention and surface modification ITER-like forged tungsten with grains elongated perpendicular surface, pure neon-seeded plasma exposures were performed in linear device PSI-2. The ion percentage mixed was around 10%. sample temperature fluence kept at 450 K 1 × 10 26 m −2 , respectively. incident energy 40 eV, just reaching sputtering threshold for neon. Surface observations show that leads pronounced cracking...
The source of the broad radiation fast hydrogen atoms in plasmas containing noble gases remains one most discussed problems relating to plasma–solid interface. In this paper, we present a detailed study Balmer lines emission generated by and deuterium an energy range between 40 300 eV linear magnetised plasma. experiments were performed gas mixtures or (He, Ne, Ar, Kr Xe). low-pressure regime (0.01–0.1 Pa) plasma operation is detected using high spectral spatial resolution spectrometers at...
The influence of helium and argon impurities on the deuterium retention in tungsten is investigated by a numerical diffusion model, which treats diffusing depth profiles for or tungsten, taking into account suggested effects argon. With helium, nanobubble layer builds up at surface sample, with depths higher than penetration incident ions. nanobubbles form porous network, allows release trapped recombination through pores to surface. For argon, only shallow argon-induced defects exists, also...
To investigate the synergistic effects of fuel retention in tungsten, experiments were performed linear plasma device PSI-2 where transient heat loads applied by a high energy laser during steady-state operation. The impact on deuterium (D) simultaneous and sequential exposures to has been investigated. A significant increase D retention, more than factor 12, observed exposure. Successive also show increased content D-atoms 3.6 comparison pure loading. In both cases is most likely due...
In this work we investigate the applicability of several optical emission spectroscopy methods to measure electron density and temperature in deuterium plasma linear generator PSI-2. The measurements are realized by an imaging spectrometer which delivers radial profiles lines. With application inverse Abel transformation, spatially resolved obtained.The divide into two groups: measurement ne Balmer line ratios rotational molecules is only suitable for ionizing plasmas; Stark broadening...
A hyperspectral camera (HSC-type Specim IQ) has been applied at the linear plasma device PSI-2 under steady-state conditions. The capacity of imaging (HSI) with dimension a data array 512 × 204 (x, y, λ) covering spectral span from 400 to 1000 nm moderate average resolution (FWHM ∼7 nm). After radiometric calibration and background/continuum emission subtraction, two main applications camera, (i) diagnostics in helium (He) plasmas (ii) plasma-material interaction studies tungsten (W) targets...
This study presents results from PSI-2 deuterium plasma exposures of reduced-activation ferritic martensitic steels with different tungsten content at a peak flux 9 · 1020 D/m2s and 420–920 K sample temperature. Via optical emission spectroscopy the relative sputtering yield Fe Cr, via an infrared camera evolution surface morphology is studied in-situ in 2D. After exposure, RBS, SEM EDX reveal enrichment formation structures. Due to independent measurement enrichment, it possible disentangle...