A5104946649- Magnetic confinement fusion research
- Fusion materials and technologies
- Nuclear reactor physics and engineering
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Nuclear Materials and Properties
- Nuclear Physics and Applications
- Particle Dynamics in Fluid Flows
- Fault Detection and Control Systems
- Military Defense Systems Analysis
- Anomaly Detection Techniques and Applications
- Particle accelerators and beam dynamics
- Laser-induced spectroscopy and plasma
Aalto University
2020-2024
Max Planck Institute for Plasma Physics
2024
Puolustusvoimien tutkimuslaitos
2018
Finnish Defence Forces
2018
Abstract The JET hybrid scenario has been developed from low plasma current carbon wall discharges to the record-breaking Deuterium-Tritium plasmas obtained in 2021 with ITER-like Be/W wall. development started pure Deuterium refinement of current, and toroidal magnetic field choices succeeded solving heat load challenges arising 37 MW injected power ITER like environment, keeping radiation edge core controlled, avoiding MHD instabilities reaching high neutron rates. have re-run Tritium...
Abstract After the second Deuterium–Tritium Campaign (DTE2) in JET tokamak with ITER-Like Wall (ILW) and full tritium campaigns that preceded followed after DTE2, a sequence of fuel recovery methods was applied to promote removal from wall components. The started several days baking main chamber walls at 240 °C 320 °C. Subsequently, superimposed Ion-Cyclotron Conditioning (ICWC) Glow Discharge (GDC) cleaning cycles deuterium. Diverted plasma operation deuterium different strike point...
Abstract The paper provides an overview of recent modelling global material erosion and deposition in the fusion devices Wendelstein 7-X (W7-X), JET ITER using Monte-Carlo code ERO2.0. For validating tool a three-dimensional environment, W7-X simulations are performed to describe carbon from graphite test divertor units, which were equipped operational phase OP 1.2 analysed post-mortem. Synthetic spectroscopy line emission is compared with experimental results spectrometer measurement...
Gross and net erosion of tungsten (W) other plasma-facing materials in the divertor region have been investigated deuterium (D) helium (He) plasmas during dedicated experiments L- H-mode on ASDEX Upgrade after full-length experimental campaigns WEST tokamak. Net was determined via post-exposure analyses plasma-exposed samples full-size wall components, we conclude that same approach is applicable to gross if marker structures with sub-millimeter dimensions are used eliminate contribution...
Abstract A sequence of fuel recovery methods was tested in JET, equipped with the ITER-like beryllium main chamber wall and tungsten divertor, to reduce plasma deuterium concentration less than 1% preparation for operation tritium. This also a key activity regard refining clean-up strategy be implemented at end 2nd DT campaign JET (DTE2) assess tools that are envisaged mitigate tritium inventory build-up ITER. The began 4 days baking 320 °C, followed by further which Ion Cyclotron Wall...
Abstract Predictive edge and core simulations of tungsten (W) erosion transport in JET ITER-like wall plasmas are shown to be consistent with the experimentally inferred W density main plasma, within uncertainty inherited from measurements deuterium plasma conditions measurements. The ERO2.0 code is applied predicting transport, whereas JINTRAC predicts pedestal top plasma. studied scenarios range L-mode highest-performance ELMy H-mode JET.
Simulations of JET ITER-like wall high-confinement mode plasmas, including type-I edge-localised modes (ELMs), using JINTRAC for the background plasmas and ERO2.0 tungsten erosion transport, predict virtually perfect screening primary W sources at divertor targets during both ELM inter-ELM phases. The largest source influx to main plasma is predicted be outer vertical due sputtering by energetic fuel (D, T) atoms from charge-exchange reactions. predictions accurately reproduce measured I...
Tungsten sputtering rates and density profiles predicted using the edge plasma codes EDGE2D-EIRENE DIVIMP are found to agree within a factor of 4 with measurements neutral singly-ionized W spectral line emission in JET low-field side (LFS) divertor, 2 SXR, VUV, bolometric calculations main plasma. The predictions extended core JINTRAC integrated core-edge modelling. Prompt redeposition is identified as primary reason for discrepancy between measured divertor. studied plasmas include attached...
The average tungsten concentrations in the pedestal region (cW) predicted by Monte Carlo code DIVIMP and coupled multi-fluid plasma/kinetic neutral EDGE2D-EIRENE are found to agree within a factor of 2 for range JET-ILW L-mode H-mode plasma conditions. Under attached divertor conditions with cW exceeding 10−6, is consistently ~50% higher than EDGE2D-EIRENE. In colder scenarios <10-6, stochastic variations exceed systematic disagreement between two codes. charge upstream scrape-off layer...
Estimates for 2D distributions of electron density, ne, and temperature, Te, have been obtained using reflection-corrected tomographic reconstructions deuterium Balmer line emission in the JET divertor. The solutions are by a two-dimensional Monte Carlo optimization model, based on intensity ratios Dα, Dγ Dε ADAS photon coefficients with additional constraints provided line-integrated spectroscopic measurements ne Te. Synthetic benchmarks utilizing EDGE2D-EIRENE simulation outputs yield...
Abstract Predictions of the scrape‐off layer (SOL) plasma conditions from 2D multi‐fluid code EDGE2D‐EIRENE are compared to OEDGE 1D fluid for JET low‐confinement mode (L‐mode) plasmas. In low‐recycling divertor (divertor target collisionality ), and agree on electron temperature, ion density within 10% in low‐field side (LFS) X‐point region SOL) 25% LFS midplane region. high‐recycling (), predictions both codes temperature 20%, while differences increase as high 50% SOL.
Abstract The hydrogenic two‐point model (H‐2PM), an analytical for the scrape‐off layer that predicts a common electron and ion temperature density along flux tube from target density, is adapted to single‐species helium (He) model, preserving 2PM assumptions nature. Across range of densities heating powers, predicted within upstream measurements by high‐resolution Thomson scattering (HRTS) low‐confinement He plasmas performed in JET ITER‐like wall (JET‐ILW). For high‐recycling conditions,...
Sudden inflows of W particulate are routinely observed in correlation with plasma instabilities JET-ITER-Like-Wall experimental campaigns. Dust acoustic wave destabilization by micrometer-size tungsten dust released such events is simulated here using realistic parameters describing the JET scrape-off layer. Such low-frequency waves may serve as a monitorable signal for detection layer on pulse-by-pulse basis.
Abstract An overview of the modeling approaches, validation methods and recent main results analysis activities related to plasma-surface interaction (PSI) in JET-ILW experiments, including H/D/T campaigns, is presented this paper. Code applications JET experiments improve general erosion/migration/retention prediction capabilities as well various physics extensions, for instance a treatment dust particles transport detailed description melting splashing PFC induced by transient events at...
In this paper, we report experimental and numerical investigations of gross net erosion gold (Au) molybdenum (Mo), proxies for the common plasma-facing material tungsten (W), during L-mode plasma discharges in deuterium (D) outer strike-point region ASDEX Upgrade tokamak. To end, profiles different marker spots (for Au, dimensions 1 × 5 mm2) coatings Mo) have been determined modelled using ERO code. The smaller were designed to quantify gross-erosion rate while on bigger markers local prompt...
This paper presents a method for analyzing the effect of class artillery-launched sensor fuzed munitions on target, which is system consisting several target elements and fault logic.The are armored vehicles designed specifically to attack single vehicles.We consider may contain one or two submunitions.We want address following questions: what probability disabling given number ammunition, similarly, how much ammunition needed with confidence level.The proposed based Markov chains rather...
EDGE2D-EIRENE simulations of nitrogen-seeded partially detached JET l-mode plasmas show that the divertor N I to V radiation distributions are highly sensitive upstream electron density, and less changes in assumed cross-field particle diffusivity for nitrogen ions. The reproduce peak intensities as measured by vertically viewing filterscopes within 50 % a narrow range density experimental uncertainties, while predicted profiles narrower than ones. Including atoms only ERO2.0 implies lower...