Archivio Istituzionale della RicercaIn DIII-D and other tokamaks, with a fixed system voltage limit, the parameter that limits the ICRF power that can be coupled to H-mode plasmas is the antenna loading resistance R_L. For a fixed antenna geometry and excitation (phasing), R_L is determined by the electron density profile in the antenna near-field region. Quantitative understanding of the coupling physics is obtained by comparing the resistive (R_L) and reactive components of the antenna loading, without and with plasma, to predictions of 3-D models of the antenna and the edge plasma (Microwave Studio and TOPICA). When measured density profiles from reflectometers are used, good agreement between predicted and measured values of R_L is obtained without any adjustable parameters in the model. The improved understanding is applied to enhancement of R_L in advanced scenarios in DIII-D to increase the coupled fast wave power.
Comparison of 3-D Modeling With Experimental Results on Fast Wave Antenna Loading in DIII-D / Pinsker, R.I., Ryan, P.M., Goulding, R.H., Hanson, G.R., Milanesio, D., Maggiora, R., Hosea, J.C., Nagy, A., Porkolab, M., Zeng, L.. - In: BULLETIN OF THE AMERICAN PHYSICAL SOCIETY. - ISSN 0003-0503. - 56:(2011). (53rd Annual Meeting of the APS Division of Plasma Physics Salt Lake City, Utah, USA November 14–18, 2011).
Comparison of 3-D Modeling With Experimental Results on Fast Wave Antenna Loading in DIII-D
MILANESIO, DANIELE;MAGGIORA, Riccardo;
2011
Abstract
In DIII-D and other tokamaks, with a fixed system voltage limit, the parameter that limits the ICRF power that can be coupled to H-mode plasmas is the antenna loading resistance R_L. For a fixed antenna geometry and excitation (phasing), R_L is determined by the electron density profile in the antenna near-field region. Quantitative understanding of the coupling physics is obtained by comparing the resistive (R_L) and reactive components of the antenna loading, without and with plasma, to predictions of 3-D models of the antenna and the edge plasma (Microwave Studio and TOPICA). When measured density profiles from reflectometers are used, good agreement between predicted and measured values of R_L is obtained without any adjustable parameters in the model. The improved understanding is applied to enhancement of R_L in advanced scenarios in DIII-D to increase the coupled fast wave power.
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https://hdl.handle.net/11583/2462181
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