Page 3 - Overview of C-2W Results and Diagnostic Systems
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Executive Summary
• Efficient fast wave coupling with phased-array (4-strap) antenna has been demonstrated on LAPD:
Ø Fast wave coupling (at all phases) increases as antenna approaches denser plasma;
Ø Fast wave can couple and propagate into plasma core even when edge plasma density ne ~ 1x1018 m-3;
Ø Fast wave propagation direction is well controlled by relative phase between antenna straps;
Ø No slow wave has been observed, this is in good agreement with calculations of HHFW dispersion relation
• Matching network, decoupler, antenna impedance measurement probes and phase detector, have been built at TAE facility; they are ready for LAPD onsite installation and commissioning.
• After the completion of RF subsystem upgrade, two RF campaigns will be performed with 4-strap HHFW antenna.
Acknowledgements
o TAE Technologies’ HHFW project for C-2W FRC plasma device is partially funded by
US DoE INFUSE program 2019/20 award and 2020/21 award;
o The experiments were performed at UCLA’s Basic Plasma Science Facility, which is supported by US DoE, and the NSF.
62nd APS-DPP, November 9-13, 2020 3
