High-power helicon system commissioning and conditioning progress on DIII-D

Squire, Jared P.; Brookman, Michael W.; Compernolle, Bart Van; Garofalo, Andrea M.; Moeller, Charles P.; McAllister, Levi; Nagy, Alex; Pinsker, Robert I.; Porkolab, Miklos; Torrezan, Antonio C.

doi:10.1063/5.0162682

DOE OSTI · 1996568

High-power helicon system commissioning and conditioning progress on DIII-D

Squire, Jared P.·Brookman, Michael W.·Compernolle, Bart Van·Garofalo, Andrea M.·Moeller, Charles P.·McAllister, Levi·Nagy, Alex·Pinsker, Robert I.·Porkolab, Miklos·Torrezan, Antonio C.

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Abstract

The high-power helicon, aka fast wave in the lower hybrid range of frequencies (LHRF), program has completed initial experiments at DIII-D. A 30-element comb-line traveling wave antenna successfully coupled over 0.3 MW of rf power at 476 MHz into both L-mode and ELMing H-mode plasmas for approximately 0.2 s. Here, we describe the helicon systems that enabled high-power operations, and the progress of conditioning in June 2021. Upgraded vacuum feedthroughs are described.

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY Plasma confinement Tokamaks

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Squire, Jared P., Brookman, Michael W., Compernolle, Bart Van, Garofalo, Andrea M., Moeller, Charles P., McAllister, Levi, Nagy, Alex, Pinsker, Robert I., Porkolab, Miklos, Torrezan, Antonio C.. 2023-08-18. High-power helicon system commissioning and conditioning progress on DIII-D. https://doi.org/10.1063/5.0162682

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