Three-dimensional simulation of the vertical displacement event in tokamaks

Shin, Kyo Jin; Lim, Yegeon; Shon, Chae-Hwa; Lee, J.K.

doi:10.1109/27.763072

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…Plasma-Facing Components (PFCs) are faced magnificent electromagnetic (EM) loads during VDE disruption [1][2][3][4] , a significant event caused by the failure of magnetic field control [5][6][7] and the instability of the internal plasma excitation (magnetohydrodynamic, MHD perturbations [8][9] ). There are many reasons for the excitation of the disruptions, which are often accompanied by the increase of impurities density concentration in the core region (r/a=0) [10][11][12][13][14][15] , the increase of the E×B drift force [16][17][18] , the perturbation change of the plasma rotation velocity, and the turbulence caused by the instability of the magnetic fluids (MHD).…”

Section: Introductionmentioning

confidence: 99%

Prediction of Electromagnetic Loads for HL-2M Plasma Facing Components in Vertical Displacement Event

Chen

Liu

et al. 2022

Preprint

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Three-dimension (3-D) geometry models are established for HL-2M tokamak Plasma-Facing Components (PFCs), including Vacuum Vessel (VV) and divertor by ANSYS in this study. We predict Electromagnetic (EM) loads during an upwards Vertical Displacement Event (VDE) disruption by introducing plasma & magnetic field coils currents models. Eddy currents are induced due to the decay of plasma current and then flow into the PFCs components. The interaction between eddy currents and magnetic fields generates enormous EM forces and torques. During the VDE disruption, the halo currents are also born due to plasma currents moving to VV and divertor accompanied with dynamic evolution. Halo currents flow into VV and divertor inside components from the inner &outer target plate, the demo plate, and the cassette box. We found that the EM loads are most substantial on the radial& poloidal EM forces by introducing discretized spatiotemporal current profiles calculated from the DINA code. Inward & upward forces are the dominant factor in the VV and divertor. It may provide helpful experiences in designing China Fusion Engineering Test Reactor (CFETR).

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Section: Introductionmentioning

confidence: 99%

Prediction of Electromagnetic Loads for HL-2M Plasma Facing Components in Vertical Displacement Event

Chen

Liu

et al. 2022

Preprint

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“…A prominent example of a fixed-boundary major disruption simulation showing a thermal quench is the kink-ballooning simulation of Park. 12 Free-boundary simulations, which have the computational boundary beyond the last-closed flux surface, have primarily been used for VDE disruptions 13,14 or studies of liquid walls, 15 where the dominant axisymmetric nature of the instability gives weak stochasticity ͑or none if only the n =0 component is kept͒. For more non-axisymmetric modes, accurate modeling of rapid parallel equilibration in three dimensions is required to resolve the distinction between the halo region and core region as the plasma evolves nonlinearly and becomes highly stochastic.…”

Section: Simulation Modelmentioning

confidence: 99%

Dynamics of the major disruption of a DIII-D plasma

2005

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The dynamics of the major disruption of DIII-D discharge 87009 are investigated with the NIMROD code ͓Sovinec et al., J. Comput. Phys. 195, 355 ͑2004͔͒. To explore the time dynamics in a computationally efficient manner, a fixed-boundary equilibrium is used to model the physics of a plasma being heated through an ideal magnetohydrodynamic ͑MHD͒ instability threshold. This simulation shows a faster-than-exponential increase in magnetic energy as predicted by analytic theory ͓Callen et al., Phys. Plasmas 6, 2963 ͑1999͔͒. The dynamics of the heat flux loading on the divertor surfaces is explored with an equilibrium that has the plasma beta raised 8.7% above the best equilibrium reconstruction to start above the ideal MHD threshold. The nonlinear evolution of the ideal mode leads to a stochastic magnetic field and parallel heat transport leads to a localization of the heat flux that is deposited on the wall. The structure of the heat flux deposition is dependent upon the magnetic topology that results from the growth of the ideal mode.

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The effects of race-track and DRAKON configurations on MHD equilibria and stabilities in toroidal devices

Gong

Zhang

et al. 2008

Vacuum

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Three-dimensional simulation of the vertical displacement event in tokamaks

Cited by 4 publications

References 4 publications

Prediction of Electromagnetic Loads for HL-2M Plasma Facing Components in Vertical Displacement Event

Prediction of Electromagnetic Loads for HL-2M Plasma Facing Components in Vertical Displacement Event

Dynamics of the major disruption of a DIII-D plasma

The effects of race-track and DRAKON configurations on MHD equilibria and stabilities in toroidal devices

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