August 2011

Conference Paper

Design Concepts For A Long Pulse Upgrade For The DIII-D Fast Wave Antenna Array

By:
Ryan, Philip M; Baity Jr, Frederick W; Caughman, John B; Goulding, Richard H; Hosea, Joel; Greenough, Nevell; Nagy, Alex; Pinsker, R.; Rasmussen, David A
Page Number:
305-308
Volume:
1187
Book Title:
Radio Frequency Power in Plasmas
Publication Date:
August 18, 2011
Publisher Location:
AMER INST PHYSICS, 2 HUNTINGTON QUADRANGLE, STE 1NO1, Melville, New York, United States of America
Conference Name:
18th Topical Conference on Radio Frequency Power in Plasmas
Conference Location:
Ghent, Belgium
Conference Sponsor:
Spinner GmbH; ITER Belgium; SCK CEN; Taylor & Francis Grp; Thomson Broadcast & Multimedia; Univ Gent
View DOI Listing:
https://doi.org/10.1063/1.3273754

Abstract

A goal in the 5-year plan for the fast wave program on DIII-D is to couple a total of 3.6 MW of RF power into a long pulse, H-mode plasma for central electron heating. The present short-pulse 285/300 antenna array would need to be replaced with one capable of at least 1.2 MW, 10 s operation at 60 MHz into an H-mode (low resistive loading) plasma condition. The primary design under consideration uses a poloidally-segmented strap (3 sections) for reduced strap voltage near the plasma/Faraday screen region. Internal capacitance makes the antenna structure self-resonant at 60 MHz, strongly reducing peak E-fields in the vacuum coax and feed throughs.

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