First high-power helicon results from DIII-D

the DIII-D team

doi:10.1088/1741-4326/ad78e8

First high-power helicon results from DIII-D

the DIII-D team

Advanced Tokamak Physics

Research output: Contribution to journal › Article › peer-review

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).

Original language	English
Article number	126058
Journal	Nuclear Fusion
Volume	64
Issue number	12
DOIs	https://doi.org/10.1088/1741-4326/ad78e8
State	Published - Dec 2024

Funding

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Awards DE-FC0204ER54698, DE-SC0016154, DE-SC0020649, DE-AC52-07NA27344, DE-SC0020337, DE-FG02-07ER54917, DE-AC05-00OR22725, and DE-AC02-09CH11466.

Funders	Funder number
U.S. Department of Energy
Fusion Energy Sciences
Office of Science	DE-AC05-00OR22725, DE-FC0204ER54698, DE-SC0016154, DE-SC0020649, DE-AC02-09CH11466, DE-AC52-07NA27344, DE-FG02-07ER54917, DE-SC0020337
Office of Science

Keywords

comb-line
DIII-D
fast waves
helicon
traveling-wave antenna

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/1741-4326/ad78e8

Cite this

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title = "First high-power helicon results from DIII-D",

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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author = "{the DIII-D team} and Pinsker, {R. I.} and {Van Compernolle}, B. and Tang, {S. X.} and Lestz, {J. B.} and Moeller, {C. P.} and Petty, {C. C.} and A. Dupuy and Squire, {J. P.} and Garofalo, {A. M.} and M. Porkolab and Rost, {J. C.} and Baek, {S. G.} and A. Nagy and S. Chowdhury and Crocker, {N. A.} and Degrandchamp, {G. H.} and McLean, {A. G.} and Gage, {K. R.} and A. Marinoni and Martin, {E. H.} and G. Ronchi",

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language = "English",

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AU - the DIII-D team

AU - Pinsker, R. I.

AU - Van Compernolle, B.

AU - Tang, S. X.

AU - Lestz, J. B.

AU - Moeller, C. P.

AU - Petty, C. C.

AU - Dupuy, A.

AU - Squire, J. P.

AU - Garofalo, A. M.

AU - Porkolab, M.

AU - Rost, J. C.

AU - Baek, S. G.

AU - Nagy, A.

AU - Chowdhury, S.

AU - Crocker, N. A.

AU - Degrandchamp, G. H.

AU - McLean, A. G.

AU - Gage, K. R.

AU - Marinoni, A.

AU - Martin, E. H.

AU - Ronchi, G.

PY - 2024/12

Y1 - 2024/12

N2 - 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).

AB - 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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KW - DIII-D

KW - fast waves

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KW - traveling-wave antenna

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JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 12

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ER -

First high-power helicon results from DIII-D

Abstract

Funding

Keywords

UN SDGs

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