A 2-D Numerical Simulation of ITER-FEAT Disruptive Hot Plasma-Wall Interaction and Model Validation against Disruption Simulation Experiments

Würz, H.; Pestchanyi, S.; Landman, I.; Базылев, Б.; Tolkach, V. I.; Kappler, F.

doi:10.13182/fst01-a191

Cited by 17 publications

(3 citation statements)

References 16 publications

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“…As shown earlier in [1,6,16,17], accounting for electrostatic and spin-orbit splitting of configurations and spectral lines considerably influences the dynamics of the energy balance in the plasma. A method of calculating the optical coefficients for high-Z plasma was developed and implemented in [16] by means of the collision-radiation equilibrium (CRE) model.…”

Section: Opacitiesmentioning

confidence: 88%

Simulation and optimization of DPP hydrodynamics and radiation transport for EUV lithography devices

et al. 2004

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Discharge produced plasma (DPP) devices are being used as a light source for Extreme Ultraviolet (EUV) Lithography. A key challenge for DPP is achieving sufficient brightness to support the throughput requirements of exposure tools for high-volume manufacturing lithography. An integrated model is being developed to simulate the environment of the EUV source and optimize the output of the source. The model describes the hydrodynamic and optical processes that occur in DPP devices. It takes into account plasma evolution and magnetohydrodynamic processes as well as detailed photon radiation transport. The total variation diminishing scheme in the Lax-Friedrich formulation for the description of magnetic compression and diffusion in a cylindrical geometry is used. Several models are being developed for opacity calculations: a collisional radiation equilibrium model, a self-consistent field model with Auger processes, and a non-stationary kinetic model. Radiation transport for both continuum and lines with detailed spectral profiles is taken into account. The developed models are being integrated into the HEIGHTS-EUV computer simulation package. Preliminary results of a numerical simulation of xenon gas hydrodynamics and EUV radiation output are presented for various plasma conditions.

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Section: Opacitiesmentioning

confidence: 88%

Simulation and optimization of DPP hydrodynamics and radiation transport for EUV lithography devices

et al. 2004

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“…Note that it is widely accepted that, as the energy flux from ELMs (or laser beam) significantly heats the plasmafacing components (or metal plate), the evaporation of atoms from the surface will produce a significant amount of vapor that will presumably shield the metal surface from further heating and evaporation due to the external energy load; e.g. see [47,48]. In order to accurately describe such a phenomenon, a nonlinear interaction between the external energy load and the freshly produced vapor from the arc spot should be considered.…”

Section: Equations and Boundary Conditionsmentioning

confidence: 99%

Numerical simulation of the initial stage of unipolar arcing in fusion-relevant conditions

Kaufmann

Silva

Benilov

2019

Plasma Phys. Control. Fusion

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A model for the initial phase of unipolar arcing has been developed with account of an externalenergy source which triggers the arcing, the vaporization of the atoms from the heated surface, the ions and electrons produced by ionization of the vapor, the electron emission from the metal surface, and melt motion and surface deformation. Current transfer outside the arc attachment is taken into account and the potential difference between the plasma and the metal surface (the plate) is evaluated from the condition that the net current transferred to the plate is zero at each moment. The model is used for simulation of the interaction of an external energy load (laser beam) with a tungsten plate immersed in a helium background plasma. The results revealed the formation of a crater, but no jet formation or droplet detachment. If the plate is large ( = R 100 mm), the peak temperature attained is 5200 K, and the plate potential remains below the plasma potential. If the plate is small ( = R 10 mm), a peak temperature of 7500 K is reached, the potential of the plate surpasses the plasma potential, circulation of the melt at the pool periphery occurs, and the erosion (which is mainly due to the vaporization of the metal atoms in the spot) reaches the value of 37 μg.

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“…Analytical [14] and numerical studies [15][16][17][18] have been also carried out for the vapor shielding. The analytical model predicts that the absorbed energy E max is dependent on the square-root of its pulse duration τ pulse as E max ∝ √ τ pulse .…”

Section: Estimation Of Suppressed Erosion By Vapor Shielding At Be An...mentioning

confidence: 99%

Estimation of suppressed erosion by vapor shielding at Be and W walls under transient loads

et al. 2019

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In ITER and future fusion devices, wall erosion caused by transient heat loads, edge-localized modes (ELMs) and disruptions is a serious concern. Suppression of the erosion occurs when a significant vapor emission happens under the heat loads, which is known as vapor shielding. Estimation of the suppressed erosion amount is essential for life time analysis and reactor design. In this study, we developed a particle-in-cell simulation code for the vapor shielding, PIXY, and applied the code to the erosion estimation for Be and W walls under a pulsed heat flux of 1-20 GW m −2 within 0.2 ms, which simulates a short-duration ELM pulse. Heat fluxes reaching the wall are recorded separately for electrons and ions, and reveal effective physical processes during the vapor shielding at Be and W walls. Then, for these walls, the total erosion amounts with and without vapor shielding are evaluated and compared. Estimated total erosion is larger for the Be wall up to 10 GW m −2 . The Be wall erosion becomes saturated for the heat flux >10 GW m −2 due to its effective shielding, while the estimated W wall erosion eventually overcomes the Be wall erosion. In the short-time scale studied in this paper, effective radiation cooling by W vapor clouds is not observed. A simple wall life time analysis based on the estimated erosion rate shows 10 mm of W wall will survive 10 7 ELM loads with energy density less than 1 MJ m −2 .

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A 2-D Numerical Simulation of ITER-FEAT Disruptive Hot Plasma-Wall Interaction and Model Validation against Disruption Simulation Experiments

Cited by 17 publications

References 16 publications

Simulation and optimization of DPP hydrodynamics and radiation transport for EUV lithography devices

Simulation and optimization of DPP hydrodynamics and radiation transport for EUV lithography devices

Numerical simulation of the initial stage of unipolar arcing in fusion-relevant conditions

Estimation of suppressed erosion by vapor shielding at Be and W walls under transient loads

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