Fast wave current drive antenna performance on DIII-D
- General Atomics, San Diego, CA (United States)
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
- Oak Ridge National Lab., TN (United States)
Fast wave current drive (FWCD) experiments at 60 MHz are being performed on the DIII-D tokamak for the first time in high electron temperature, high {beta} target plasmas. A four-element phased-array antenna is used to launch a directional wave spectrum with the peak n{sub {parallel}} value ({approx_equal} 7) optimized for strong single-pass electron absorption due to electron Landau damping. For this experiment, high power FW injection (2 MW) must be accomplished without voltage breakdown in the transmission lines or antenna, and without significant impurity influx. In addition, there is the technological challenge of impedance matching a four-element antenna while maintaining equal currents and the correct phasing (90{degree}) in each of the straps for a directional spectrum. In this paper we describe the performance of the DIII-D FWCD antenna during initial FW electron heating and current drive experiments in terms of these requirements.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER51114; AC05-84OR21400
- OSTI ID:
- 10124507
- Report Number(s):
- GA-A-20694; CONF-910869-27; ON: DE92008052
- Resource Relation:
- Conference: 9. topical conference on radio frequency power in plasmas,Charleston, SC (United States),19-21 Aug 1991; Other Information: PBD: Oct 1991
- Country of Publication:
- United States
- Language:
- English
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Fast wave current drive experiment on the DIII-D tokamak
Fast wave current drive experiment on the DIII-D tokamak