### Session GO4: DIII-D Tokamak

9:30 AM–12:30 PM, Tuesday, November 15, 2011
Room: Ballroom E

Chair: David Pace, ORISE

Abstract ID: BAPS.2011.DPP.GO4.11

### Abstract: GO4.00011 : Comparison of 3-D Modeling With Experimental Results on Fast Wave Antenna Loading in DIII-D

11:30 AM–11:42 AM

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#### Authors:

R.I. Pinsker
(General Atomics)

P.M. Ryan
R.H. Goulding
G.R. Hanson
(ORNL)

D. Milanesio
R. Maggiora
(Torina Politecnico)

J.C. Hosea
A. Nagy
(PPPL)

M. Porkolab
(MIT)

L. Zeng
(UCLA)

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.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.DPP.GO4.11