First access to ELM-free negative triangularity at low aspect ratio

Abstract A plasma scenario with negative triangularity (NT) shaping is achieved on MAST-U for the first time. While edge localized modes (ELMs) are eventually suppressed as the triangularity is decreased below <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mi>δ</mml:mi> <mml:mo>≲</mml:mo> <mml:mo>−</mml:mo> <mml:mn>0.06</mml:mn> </mml:mrow> </mml:math> , an extended period of H-mode operation with Type-III ELMs is sustained at less negative δ even through access to the second stability region for ideal ballooning modes is closed. This documents a qualitative difference from the ELM-free access conditions documented in NT scenarios on conventional aspect ratio machines. The electron temperature at the pedestal top drops across the transition to ELM-free operation, but a steady rise in core temperature as δ is decreased allows for similar normalized β in the ELM-free NT and H-mode positive triangularity shapes.

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Publication Details

Journal
Nuclear Fusion
Published
2024-10-22
DOI
https://doi.org/10.1088/1741-4326/ad89db
Citations
7
Primary Topic
Magnetic confinement fusion research
Type
article
Field-Weighted Citation Impact
4.62

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article

First access to ELM-free negative triangularity at low aspect ratio

G. McArdle, H. Anand, K. Imada, J. F. Parisi et al.
7 citations
Nuclear Fusion
Magnetic confinement fusion research
4.62
article

First access to ELM-free negative triangularity at low aspect ratio

G. McArdle, H. Anand, K. Imada, J. F. Parisi, A. O. Nelson, M. Kochan, J. Lovell, C. Paz-Soldan, C.H. Vincent, Sarah E. Blackmore, S. Guizzo, L. Rondini, S. Freiberger, Harold S. Wilson, W Wehner
article en
7 citations

Abstract

Abstract A plasma scenario with negative triangularity (NT) shaping is achieved on MAST-U for the first time. While edge localized modes (ELMs) are eventually suppressed as the triangularity is decreased below <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mi>δ</mml:mi> <mml:mo>≲</mml:mo> <mml:mo>−</mml:mo> <mml:mn>0.06</mml:mn> </mml:mrow> </mml:math> , an extended period of H-mode operation with Type-III ELMs is sustained at less negative δ even through access to the second stability region for ideal ballooning modes is closed. This documents a qualitative difference from the ELM-free access conditions documented in NT scenarios on conventional aspect ratio machines. The electron temperature at the pedestal top drops across the transition to ELM-free operation, but a steady rise in core temperature as δ is decreased allows for similar normalized β in the ELM-free NT and H-mode positive triangularity shapes.

Nuclear FusionVol. 64(12)
Oak Ridge National Laboratory (US), Princeton Plasma Physics Laboratory (US), United Kingdom Atomic Energy Authority (GB), University of York (GB), General Atomics (United States) (US), Columbia University (US)
Culham Centre for Fusion Energy, Fusion Energy Sciences
Openalex Percentile: Top 4%
Magnetic confinement fusion research
4.62
DOIOpen Access PDFOpenAlex
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