First high-power helicon results from DIII-D

Pinsker, R. I.; Van Compernolle, B.; Tang, S. X.; Lestz, J. B.; Moeller, C. P.; Petty, C. C.; Dupuy, A.; Squire, J. P.; Garofalo, A. M.; Porkolab, M.; Rost, J. C.; Baek, S. G.; Nagy, A.; Chowdhury, S.; Crocker, N. A.; Degrandchamp, G. H.; McLean, A. G.; Gage, K. R.; Marinoni, A.; Martin, E. H.; Ronchi, G.

doi:10.1088/1741-4326/ad78e8

Title: First high-power helicon results from DIII-D

Journal Article · 21 October 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad78e8 · OSTI ID:2472972

Pinsker, R. I.; Van Compernolle, B.; Tang, S. X.;

; Moeller, C. P.;

; Dupuy, A.; Squire, J. P.;

;

; Rost, J. C.; Baek, S. G.; Nagy, A.; Chowdhury, S.;

;

; McLean, A. G.; Gage, K. R.; Marinoni, A.;

Abstract More than 0.6 MW of rf power at 476 MHz has been coupled to DIII-D plasmas by launching helicon (whistler) waves with a traveling-wave antenna (comb-line) in the fast-wave polarization (Van Compernolle et al 2021 Nucl. Fusion 61 116034) which resulted in the observation of electron heating of the core plasma with single-pass absorption based on ray-tracing in L-mode discharges. The coupling performance of the 1.5 m wide 30-element comb-line traveling-wave antenna has been consistent with expectations based on the 2015–2016 experiments on DIII-D with a low-power 12-element prototype (Pinsker et al 2018 Nucl. Fusion 58 106007). The conditioning process that was necessary to carry out high-power experiments is discussed; rf-specific impurities have not been observed. Parametric decay instabilities have been observed and are being investigated as a potential edge absorption mechanism (Porkolab et al 2023 AIP Conf. Proc. 2984 070004).

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Research Organization:: General Atomics, San Diego, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466; AC05-00OR22725; AC52-07NA27344; FC02-04ER54698; FG02-07ER54917; SC0016154; SC0020337; SC0020649

OSTI ID:: 2472972

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 12 Vol. 64; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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