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, Daniele; Maggiora, Riccardo; Hosea, J. C.; Nagy, A.; Porkolab, M.; Zeng, L.. - In: BULLETIN OF THE AMERICAN PHYSICAL SOCIETY. - ISSN 0003-0503. - 56:(2011). (Intervento presentato al convegno 53rd Annual Meeting of the APS Division of Plasma Physics tenutosi a Salt Lake City, Utah, USA nel 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.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
https://hdl.handle.net/11583/2462181
Attenzione
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo