Wave coupling in the magnetized plasma edge: Impact of a finite, inhomogeneous density inside the antenna box

L. Lu; K. Crombé; D. Van Eester; L. Colas; J. Jacquot

doi:10.1063/1.4936491

Wave coupling in the magnetized plasma edge: Impact of a finite, inhomogeneous density inside the antenna box

L. Lu
, K. Crombé
, D. Van Eester
, L. Colas
, J. Jacquot

Laboratory for Plasma Physics

Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Université de Lorraine
University of Ghent
Max Planck Institute for Plasma Physics

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/Congresprocedure › Conferentiebijdrage › peer review

1 Citaat (Scopus)

Samenvatting

Most present Ion Cyclotron Resonant Frequency (ICRF) heating codes and antenna codes assume the antenna sitting in a vacuum region and consider the fast wave only, which implicitly performs an abrupt density transition from vacuum to above lower hybrid (LH) resonance. We studied the impact of densities that decay continuously inside the antenna box on near field patterns and power coupling. A new full wave code based on the COMSOL Finite Element Solver has been developed to investigate this topic. It is shown that: up to the memory limits of the adopted workstation, the local RF field pattern in low-density regions below the LH resonance changes with the grid size. Interestingly and importantly, however, the total coupled spectrum is independent to the mesh size and is weakly affected by the presence of the density profile inside the antenna box in dipole phasing. Thus one can drop out this density for coupling studies. Simulation also shows that varying the density gradient in the fast wave evanescence region has no significant effect on wave coupling.

Originele taal-2	Engels
Titel	Radio Frequency Power in Plasmas
Subtitel	Proceedings of the 21St Topical Conference
Redacteuren	Robert I. Pinsker
Uitgeverij	American Institute of Physics Inc.
ISBN van elektronische versie	9780735413368
DOI's	https://doi.org/10.1063/1.4936491
Status	Gepubliceerd - 10 dec. 2015
Evenement	21st Topical Conference on Radiofrequency Power in Plasmas - Lake Arrowhead, Verenigde Staten van Amerika Duur: 27 apr. 2015 → 29 apr. 2015

Publicatie series

Naam	AIP Conference Proceedings
Volume	1689
ISSN van geprinte versie	0094-243X
ISSN van elektronische versie	1551-7616

Congres

Congres	21st Topical Conference on Radiofrequency Power in Plasmas
Land/Regio	Verenigde Staten van Amerika
Stad	Lake Arrowhead
Periode	27/04/15 → 29/04/15

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Lu, L., Crombé, K., Van Eester, D., Colas, L., & Jacquot, J. (2015). Wave coupling in the magnetized plasma edge: Impact of a finite, inhomogeneous density inside the antenna box. In R. I. Pinsker (editor), Radio Frequency Power in Plasmas: Proceedings of the 21St Topical Conference Artikel 050003 (AIP Conference Proceedings; Vol. 1689). American Institute of Physics Inc.. https://doi.org/10.1063/1.4936491

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title = "Wave coupling in the magnetized plasma edge: Impact of a finite, inhomogeneous density inside the antenna box",

abstract = "Most present Ion Cyclotron Resonant Frequency (ICRF) heating codes and antenna codes assume the antenna sitting in a vacuum region and consider the fast wave only, which implicitly performs an abrupt density transition from vacuum to above lower hybrid (LH) resonance. We studied the impact of densities that decay continuously inside the antenna box on near field patterns and power coupling. A new full wave code based on the COMSOL Finite Element Solver has been developed to investigate this topic. It is shown that: up to the memory limits of the adopted workstation, the local RF field pattern in low-density regions below the LH resonance changes with the grid size. Interestingly and importantly, however, the total coupled spectrum is independent to the mesh size and is weakly affected by the presence of the density profile inside the antenna box in dipole phasing. Thus one can drop out this density for coupling studies. Simulation also shows that varying the density gradient in the fast wave evanescence region has no significant effect on wave coupling.",

author = "L. Lu and K. Cromb{\'e} and \{Van Eester\}, D. and L. Colas and J. Jacquot",

note = "Funding Information: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Erasmus Fusion-DC and the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.; 21st Topical Conference on Radiofrequency Power in Plasmas ; Conference date: 27-04-2015 Through 29-04-2015",

year = "2015",

month = dec,

day = "10",

doi = "10.1063/1.4936491",

language = "English",

series = "AIP Conference Proceedings",

publisher = "American Institute of Physics Inc.",

editor = "Pinsker, \{Robert I.\}",

booktitle = "Radio Frequency Power in Plasmas",

}

Lu, L, Crombé, K , Van Eester, D, Colas, L & Jacquot, J 2015, Wave coupling in the magnetized plasma edge: Impact of a finite, inhomogeneous density inside the antenna box. in RI Pinsker (reds.), Radio Frequency Power in Plasmas: Proceedings of the 21St Topical Conference., 050003, AIP Conference Proceedings, vol. 1689, American Institute of Physics Inc., 21st Topical Conference on Radiofrequency Power in Plasmas, Lake Arrowhead, Verenigde Staten van Amerika, 27/04/15. https://doi.org/10.1063/1.4936491

Wave coupling in the magnetized plasma edge: Impact of a finite, inhomogeneous density inside the antenna box. / Lu, L.; Crombé, K.; Van Eester, D. et al.
Radio Frequency Power in Plasmas: Proceedings of the 21St Topical Conference. reds. / Robert I. Pinsker. American Institute of Physics Inc., 2015. 050003 (AIP Conference Proceedings; Vol. 1689).

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/Congresprocedure › Conferentiebijdrage › peer review

TY - GEN

T1 - Wave coupling in the magnetized plasma edge

T2 - 21st Topical Conference on Radiofrequency Power in Plasmas

AU - Lu, L.

AU - Crombé, K.

AU - Van Eester, D.

AU - Colas, L.

AU - Jacquot, J.

N1 - Funding Information: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Erasmus Fusion-DC and the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

PY - 2015/12/10

Y1 - 2015/12/10

N2 - Most present Ion Cyclotron Resonant Frequency (ICRF) heating codes and antenna codes assume the antenna sitting in a vacuum region and consider the fast wave only, which implicitly performs an abrupt density transition from vacuum to above lower hybrid (LH) resonance. We studied the impact of densities that decay continuously inside the antenna box on near field patterns and power coupling. A new full wave code based on the COMSOL Finite Element Solver has been developed to investigate this topic. It is shown that: up to the memory limits of the adopted workstation, the local RF field pattern in low-density regions below the LH resonance changes with the grid size. Interestingly and importantly, however, the total coupled spectrum is independent to the mesh size and is weakly affected by the presence of the density profile inside the antenna box in dipole phasing. Thus one can drop out this density for coupling studies. Simulation also shows that varying the density gradient in the fast wave evanescence region has no significant effect on wave coupling.

AB - Most present Ion Cyclotron Resonant Frequency (ICRF) heating codes and antenna codes assume the antenna sitting in a vacuum region and consider the fast wave only, which implicitly performs an abrupt density transition from vacuum to above lower hybrid (LH) resonance. We studied the impact of densities that decay continuously inside the antenna box on near field patterns and power coupling. A new full wave code based on the COMSOL Finite Element Solver has been developed to investigate this topic. It is shown that: up to the memory limits of the adopted workstation, the local RF field pattern in low-density regions below the LH resonance changes with the grid size. Interestingly and importantly, however, the total coupled spectrum is independent to the mesh size and is weakly affected by the presence of the density profile inside the antenna box in dipole phasing. Thus one can drop out this density for coupling studies. Simulation also shows that varying the density gradient in the fast wave evanescence region has no significant effect on wave coupling.

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T3 - AIP Conference Proceedings

BT - Radio Frequency Power in Plasmas

A2 - Pinsker, Robert I.

PB - American Institute of Physics Inc.

Y2 - 27 April 2015 through 29 April 2015

ER -

Wave coupling in the magnetized plasma edge: Impact of a finite, inhomogeneous density inside the antenna box

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