Accès ouvert
2026
article
OpenAlex
G. Rutherford, Paul T Bonoli, Collin Dunn, Ethan Peterson et autres
Abstract Negative triangularity (NT) offers a potential solution to the high heat fluxes incident on the divertor of reactor-class tokamaks by blocking access to H-mode. An important step in assessing how NT may scale to a reactor is determining the behavior of …
us
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Accès ouvert
2026
conference-paper
OpenAlex
S.J. Wukitch, M. Cengher, E. Leppink, Yijun Lin et autres
In preparation for high field side lower hybrid current drive (HFS LHCD) experiments in DIII-D, the HFS LHCD was to be commissioned and physics experiments commence once the system operated up to 300 kW for 0.5 s. The initial physics experiments sought …
us
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Accès ouvert
2026
conference-paper
OpenAlex
G. Rutherford, M. Cengher, Ivan Garcia, Malcolm Gould et autres
High field side (HFS) lower hybrid current drive (LHCD) is a promising method for efficiently driving off-axis current in steady state tokamak power plants. The first test of this technology is underway at the DIII-D tokamak. The initial physics goal is to …
us
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Accès ouvert
2026
conference-paper
OpenAlex
J. Ridzon, J. Doody, Rui Vieira, S.J. Wukitch
High field side lower hybrid current drive (HFS LHCD) is promising method for efficient, off axis current drive. To operate this system, development of an expandable combination radio frequency (RF) and vacuum interface was necessary to allow the long (~2 m) waveguides …
us
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Accès ouvert
2025
article
OpenAlex
E. Leppink, S.J. Wukitch
Simulation-based inference (SBI) is applied to high-field side (HFS) scrape-off layer (SOL) density profile reflectometry measurements on DIII-D, resulting in the inference of filament characteristics and fluctuation magnitudes. The predicted density fluctuation levels are found to be ñe,RMS≈5%–20%, which is similar in …
us
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Accès ouvert
2025
article
OpenAlex
Andrew Seltzman, S.J. Wukitch
Laser-based powder bed fusion (L-PBF) allows additive manufacture (AM) of lower hybrid current drive (LHCD) radio-frequency (RF) launchers from Glenn Research Copper, a Cr2Nb precipitation-hardened alloy (GRCop-42) in configurations unachievable with conventional machining. Rough surfaces in AM components increase RF losses and …
us
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Accès ouvert
2025
article
OpenAlex
R. Diab, S. G. Baek, A.Q. Kuang, Y. Lin et autres
Abstract The parasitic interaction between ion cyclotron range of frequencies (ICRF) waves and the edge plasma has long limited high-power ICRF utilization in magnetically confined fusion plasmas. In this paper, we report on the successful mitigation of this interaction by power tapering …
us
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2024
article
OpenAlex
Andrew Seltzman, J. Ridzon, S.J. Wukitch
Laser powder bed fusion (L-PBF) of Glenn Research Copper 84 (GRCop-84) and Glenn Research Copper 42 (GRCop-42), Cr2Nb precipitation hardened alloys, produces a fully dense, high conductivity alloy. Cr2Nb precipitates impede free flow of liquid braze material across the surface of these …
us
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Accès ouvert
2024
article
OpenAlex
C. T. Holcomb, Joseph Abbate, Alfredo Abe, A. Abrams et autres
Abstract The DIII-D tokamak has elucidated crucial physics and developed projectable solutions for ITER and fusion power plants in the key areas of core performance, boundary heat and particle transport, and integrated scenario operation, with closing the core-edge integration knowledge gap being …
us, no, jp, de, gb, nl, fr, cn, kr
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2024
article
OpenAlex
J. Ridzon, Andrew Seltzman, Smeet Patel, W. Beck et autres
GRCop-84 and GRCop-42 precipitation hardened copper alloys have high tensile strength while maintaining high electrical and thermal conductivity and can be additively manufactured (AM) by a selective laser melting (SLM) process. Because of these favorable material properties and the design freedom afforded …
us
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Accès ouvert
2024
article
OpenAlex
G. Rutherford, Samuel J. Frank, Andrew Seltzman, P. T. Bonoli et autres
Abstract High field side lower hybrid current drive (LHCD) is one potential candidate for efficient non-inductive current drive in tokamak power plants, and the first test of this technology will occur on the DIII-D tokamak during the 2024 campaign. Previous LFS launch …
us
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Accès ouvert
2024
article
OpenAlex
X.Z. Gong, Yuntao Song, Baonian Wan, Jiangang Li et autres
Abstract Since the last IAEA-FEC in 2021, significant progress on the development of long pulse steady state scenario and its related key physics and technologies have been achieved, including the reproducible 403 s long-pulse steady-state H-mode plasma with pure radio frequency (RF) …
cn
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