Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session GP11: Poster Session III: In-Person, Hall A (9:30-11:00am) and Virtual Poster Presentations (11:15am-12:30pm)
MFE: DIII-D
Low Temperature Plasma
FUND: Dusty Plasmas; Plasma Sources
9:30 AM - 12:30 PM
Tuesday, October 18, 2022
Room: Exhibit Hall A and Online
Abstract: GP11.00025 : RF Systems Development on DIII-D*
Presenter:
Mirela Cengher
(General Atomics)
Authors:
Mirela Cengher
(General Atomics)
James Anderson
(General Atomics)
kyle Thackston
(General Atomics)
Bart v Compernolle
(General Atomics)
Stephen J Wukitch
(Massachusetts Institute of Technology MI)
Yijun Lin
(Massachusetts Institute of Technology MI)
Ivan Garcia
(MIT)
Mohamed Mohamed
(MIT)
Samuel Pierson
(MIT)
J. Ridzon
(MIT)
Evan Leppink
(Massachusetts Institute of Technology)
Grant Rutherford
(Massachusetts Institute of Technology MI)
Andrew Seltzman
(Massachusetts Institute of Technology MI)
Shawn Tang
(Oak Ridge Assoc Univ)
Charles P Moeller
(General Atomics - San Diego)
Robert I Pinsker
(General Atomics - San Diego)
A. Nagy
(PPPL)
Bruce Lombardo
(General Atomics)
Jared P Squire
(General Atomics - San Diego)
Daniel Kellman
(General Atomics)
Craig C Petty
(General Atomics - San Diego)
Xi Chen
(General Atomics)
Joseph Tooker
(General Atomics)
Adrianus C Sips
(General Atomics)
The 1 MW 476 MHz Helicon system at DIII-D aims to demonstrate off-axis current drive of up to 60 kA in plasmas. The initial tests demonstrated up to 300 kW coupled power with core electron heating observed, and the aim to double the coupled power this year.
The LHCD System will include in the first step up to 1 MW of generated power from 4 klystrons injected on the high field side of the DIII-D vessel. The coupler for the LHCD System at 4.6 GHz was designed to maximize coupled power, and additive manufactured (AM) of GRCop-84 enabled integrated matching into each of the aperture joints. Upgraded AM approaches are investigated for larger components to reduce the post AM processes. We seek to assess the viability of traveling wave couplers for increased efficiency as an upgrade for the present finite directivity couplers. The LHCD installed power will be increased from 1 to 2 MW.
** Work supported by US DOE under DE-FC02-04ER54698.
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