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

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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.

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MLA
Lu, LingFeng et al. “Wave Coupling in the Magnetized Plasma Edge: Impact of a Finite, Inhomogeneous Density Inside the Antenna Box.” AIP Conference Proceedings. Vol. 1689. AIP Publishing, 2015. Print.
APA
Lu, LingFeng, 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. AIP Conference Proceedings (Vol. 1689). Presented at the 21st Topical Conference on Radiofrequency Power in Plasmas, AIP Publishing.
Chicago author-date
Lu, LingFeng, Kristel Crombé, D Van Eester, L Colas, and J Jacquot. 2015. “Wave Coupling in the Magnetized Plasma Edge: Impact of a Finite, Inhomogeneous Density Inside the Antenna Box.” In AIP Conference Proceedings. Vol. 1689. AIP Publishing.
Chicago author-date (all authors)
Lu, LingFeng, Kristel Crombé, D Van Eester, L Colas, and J Jacquot. 2015. “Wave Coupling in the Magnetized Plasma Edge: Impact of a Finite, Inhomogeneous Density Inside the Antenna Box.” In AIP Conference Proceedings. Vol. 1689. AIP Publishing.
Vancouver
1.
Lu L, Crombé K, Van Eester D, Colas L, Jacquot J. Wave coupling in the magnetized plasma edge: impact of a finite, inhomogeneous density inside the antenna box. AIP Conference Proceedings. AIP Publishing; 2015.
IEEE
[1]
L. Lu, K. Crombé, D. Van Eester, L. Colas, and J. Jacquot, “Wave coupling in the magnetized plasma edge: impact of a finite, inhomogeneous density inside the antenna box,” in AIP Conference Proceedings, CA, 2015, vol. 1689.
@inproceedings{7234639,
  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.},
  articleno    = {050003},
  author       = {Lu, LingFeng and Crombé, Kristel and Van Eester, D and Colas, L and Jacquot, J},
  booktitle    = {AIP Conference Proceedings},
  language     = {eng},
  location     = {CA},
  publisher    = {AIP Publishing},
  title        = {Wave coupling in the magnetized plasma edge: impact of a finite, inhomogeneous density inside the antenna box},
  url          = {http://dx.doi.org/10.1063/1.4936491},
  volume       = {1689},
  year         = {2015},
}

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