Simulation Analysis of Dust-Particle Transport in the Peripheral Plasma in the Large Helical Device

Shoji, M.; Tanaka, Yasunori; Pigarov, A. Yu.; Smirnov, R.D.; Masuzaki, S.; Kawamura, G.; Uesugi, Yoshihiko; Yamada, H.

doi:10.1585/pfr.9.3403132

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…It enables dust transport simulation in fully three-dimensional geometries using the grid model for the EIRENE code. The simulation has found that the LHD peripheral plasma has a function to shield the main plasma against the dust penetration by the effect of the plasma flow (mainly by the ion drag force) in the divertor legs and the heat load onto the dust particles in the ergodic layer [23]. It is also shown that the threedimensional trajectories of most of the dust particles moving along the magnetic field lines in the peripheral plasma can be explained by the simulation, which indicates the validity of the simulation [11].…”

Section: Dust Transport Simulation In the Plasma For The Long Pulse D...mentioning

confidence: 99%

Studies of dust transport in long pulse plasma discharges in the large helical device

et al. 2015

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The three-dimensional trajectories of incandescent dusts in plasmas was observed with stereoscopic fast framing cameras in the large helical device. It proved that the dusts locate in the peripheral plasma and the most of the dusts move along the magnetic field lines with acceleration which direction corresponds to the plasma flow. ICRF heated long pulse plasma discharges were terminated with release of large amounts of dusts from a closed divertor region. After the experimental campaign, the traces of exfoliation of carbon rich mixed-material deposition layers were found in the divertor region. Transport of carbon dusts is investigated using a modified dust transport simulation code which can explain the observed dust trajectories. It also shows that control of the radius of the dusts to less than 1mm is necessary to prevent the plasma termination by penetration of dusts for the long pulse discharges. Dust transport simulation including heavy metal dusts demonstrates that high heating power operation is effective for shielding the main plasma from the dust penetration by an enhanced plasma flow effect and a high heat load onto the dusts in the peripheral plasma. It shows more powerful penetration characteristic of tungsten dusts compared to that of carbon and iron dusts.

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Section: Dust Transport Simulation In the Plasma For The Long Pulse D...mentioning

confidence: 99%

Studies of dust transport in long pulse plasma discharges in the large helical device

et al. 2015

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“…It was reported that the dust transport simulation in a non-axisymmetric geometry shows that the dust transport is dominated by the plasma flow formed in the peripheral plasma [21]. Investigating the relationship between the dust particle transport and the plasma flow is also important.…”

Section: Discussion and Summarymentioning

confidence: 99%

“…It is suggested that sweeping of dusts by the plasma flow in the divertor legs is one of the functions of the LHD peripheral plasma for the protection of the main plasma from dust penetration [21]. Investigating the relation among the magnetic-field structure, the flow pattern and the dust particle trajectory in the divertor legs is important for confirming this sweeping function.…”

Section: Discussion and Summarymentioning

confidence: 99%

Visualization of Dust Particle Data with Plasma Simulation Results Using Virtual‐Reality System

Ohtani

Shoji

Ohno

et al. 2016

Contrib. Plasma Phys.

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We develop the environment in which the time-sequence experimental data of three-dimensional dust particle positions observed by the stereoscopic fast framing cameras is visualized in one virtual-reality space with the results of the equilibrium plasma simulation in the vessel device data integrally using a virtual-reality system. Since their three-dimensional relative positions can be displayed, it is possible to analyze the three-dimensional relationship between the dust trajectories, the magnetic-field structure, and the devices in the vessel. It is confirmed that the observed dust particles are distributed in the periphery region. Most dusts move along the magnetic-field line, but some particles move radially across the lines with sharply curved trajectories. The transport direction varies from place to place. This system promoted the viewers' understanding.

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Simulation Analysis of Dust-Particle Transport in the Peripheral Plasma in the Large Helical Device

Cited by 2 publications

References 11 publications

Studies of dust transport in long pulse plasma discharges in the large helical device

Studies of dust transport in long pulse plasma discharges in the large helical device

Visualization of Dust Particle Data with Plasma Simulation Results Using Virtual‐Reality System

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