Modelling of the ICRF induced e × B convection in the scrape-off-layer of ASDEX Upgrade

W. Zhang; Y. Feng; J. M. Noterdaeme; V. Bobkov; L. Colas; D. Coster; T. Lunt; R. Bilato; J. Jacquot; R. Ochoukov; D. Van Eester; A. Křivská; P. Jacquet; L. Guimarais

doi:10.1088/0741-3335/58/9/095005

Modelling of the ICRF induced e × B convection in the scrape-off-layer of ASDEX Upgrade

W. Zhang, Y. Feng, J. M. Noterdaeme, V. Bobkov, L. Colas, D. Coster, T. Lunt, R. Bilato, J. Jacquot, R. Ochoukov, D. Van Eester, A. Křivská, P. Jacquet, L. Guimarais

Laboratory for Plasma Physics

Research output: Contribution to journal › Article › peer-review

Abstract

In magnetic controlled fusion devices, plasma heating with radio-frequency (RF) waves in the ion cyclotron (IC) range of frequency relies on the electric field of the fast wave to heat the plasma. However, the slow wave can be generated parasitically. The electric field of the slow wave can induce large biased plasma potential (DC potential) through sheath rectification. The rapid variation of the rectified potential across the equilibrium magnetic field can cause significant convective transport (E × B drifts) in the scrape-off layer (SOL). In order to understand this phenomenon and reproduce the experiments, 3D realistic simulations are carried out with the 3D edge plasma fluid and kinetic neutral code EMC3-Eirene in ASDEX Upgrade. For this, we have added the prescribed drift terms to the EMC3 equations and verified the 3D code results against the analytical ones in cylindrical geometry. The edge plasma potential derived from the experiments is used to calculate the drift velocities, which are then treated as input fields in the code to obtain the final density distributions. Our simulation results are in good agreement with the experiments.

Original language	English
Article number	095005
Journal	Plasma Physics and Controlled Fusion
Volume	58
Issue number	9
DOIs	https://doi.org/10.1088/0741-3335/58/9/095005
Publication status	Published - 19 Aug 2016

Keywords

3D simulation
E × B convection
RF sheath
SOL density
radio-frequency heating

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10.1088/0741-3335/58/9/095005

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Zhang, W., Feng, Y., Noterdaeme, J. M., Bobkov, V., Colas, L., Coster, D., Lunt, T., Bilato, R., Jacquot, J., Ochoukov, R., Van Eester, D., Křivská, A., Jacquet, P., & Guimarais, L. (2016). Modelling of the ICRF induced e × B convection in the scrape-off-layer of ASDEX Upgrade. Plasma Physics and Controlled Fusion, 58(9), Article 095005. https://doi.org/10.1088/0741-3335/58/9/095005

@article{331ad784d766402f930c05ce4a874431,

title = "Modelling of the ICRF induced e × B convection in the scrape-off-layer of ASDEX Upgrade",

abstract = "In magnetic controlled fusion devices, plasma heating with radio-frequency (RF) waves in the ion cyclotron (IC) range of frequency relies on the electric field of the fast wave to heat the plasma. However, the slow wave can be generated parasitically. The electric field of the slow wave can induce large biased plasma potential (DC potential) through sheath rectification. The rapid variation of the rectified potential across the equilibrium magnetic field can cause significant convective transport (E × B drifts) in the scrape-off layer (SOL). In order to understand this phenomenon and reproduce the experiments, 3D realistic simulations are carried out with the 3D edge plasma fluid and kinetic neutral code EMC3-Eirene in ASDEX Upgrade. For this, we have added the prescribed drift terms to the EMC3 equations and verified the 3D code results against the analytical ones in cylindrical geometry. The edge plasma potential derived from the experiments is used to calculate the drift velocities, which are then treated as input fields in the code to obtain the final density distributions. Our simulation results are in good agreement with the experiments.",

keywords = "3D simulation, E × B convection, RF sheath, SOL density, radio-frequency heating",

author = "W. Zhang and Y. Feng and Noterdaeme, {J. M.} and V. Bobkov and L. Colas and D. Coster and T. Lunt and R. Bilato and J. Jacquot and R. Ochoukov and {Van Eester}, D. and A. K{\v r}ivsk{\'a} and P. Jacquet and L. Guimarais",

note = "Publisher Copyright: {\textcopyright} 2016 IOP Publishing Ltd.",

year = "2016",

month = aug,

day = "19",

doi = "10.1088/0741-3335/58/9/095005",

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Zhang, W, Feng, Y, Noterdaeme, JM, Bobkov, V, Colas, L, Coster, D, Lunt, T, Bilato, R, Jacquot, J, Ochoukov, R, Van Eester, D , Křivská, A, Jacquet, P & Guimarais, L 2016, 'Modelling of the ICRF induced e × B convection in the scrape-off-layer of ASDEX Upgrade', Plasma Physics and Controlled Fusion, vol. 58, no. 9, 095005. https://doi.org/10.1088/0741-3335/58/9/095005

TY - JOUR

T1 - Modelling of the ICRF induced e × B convection in the scrape-off-layer of ASDEX Upgrade

AU - Zhang, W.

AU - Feng, Y.

AU - Noterdaeme, J. M.

AU - Bobkov, V.

AU - Colas, L.

AU - Coster, D.

AU - Lunt, T.

AU - Bilato, R.

AU - Jacquot, J.

AU - Ochoukov, R.

AU - Van Eester, D.

AU - Křivská, A.

AU - Jacquet, P.

AU - Guimarais, L.

PY - 2016/8/19

Y1 - 2016/8/19

N2 - In magnetic controlled fusion devices, plasma heating with radio-frequency (RF) waves in the ion cyclotron (IC) range of frequency relies on the electric field of the fast wave to heat the plasma. However, the slow wave can be generated parasitically. The electric field of the slow wave can induce large biased plasma potential (DC potential) through sheath rectification. The rapid variation of the rectified potential across the equilibrium magnetic field can cause significant convective transport (E × B drifts) in the scrape-off layer (SOL). In order to understand this phenomenon and reproduce the experiments, 3D realistic simulations are carried out with the 3D edge plasma fluid and kinetic neutral code EMC3-Eirene in ASDEX Upgrade. For this, we have added the prescribed drift terms to the EMC3 equations and verified the 3D code results against the analytical ones in cylindrical geometry. The edge plasma potential derived from the experiments is used to calculate the drift velocities, which are then treated as input fields in the code to obtain the final density distributions. Our simulation results are in good agreement with the experiments.

AB - In magnetic controlled fusion devices, plasma heating with radio-frequency (RF) waves in the ion cyclotron (IC) range of frequency relies on the electric field of the fast wave to heat the plasma. However, the slow wave can be generated parasitically. The electric field of the slow wave can induce large biased plasma potential (DC potential) through sheath rectification. The rapid variation of the rectified potential across the equilibrium magnetic field can cause significant convective transport (E × B drifts) in the scrape-off layer (SOL). In order to understand this phenomenon and reproduce the experiments, 3D realistic simulations are carried out with the 3D edge plasma fluid and kinetic neutral code EMC3-Eirene in ASDEX Upgrade. For this, we have added the prescribed drift terms to the EMC3 equations and verified the 3D code results against the analytical ones in cylindrical geometry. The edge plasma potential derived from the experiments is used to calculate the drift velocities, which are then treated as input fields in the code to obtain the final density distributions. Our simulation results are in good agreement with the experiments.

KW - 3D simulation

KW - E × B convection

KW - RF sheath

KW - SOL density

KW - radio-frequency heating

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JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

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ER -

Modelling of the ICRF induced e × B convection in the scrape-off-layer of ASDEX Upgrade

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