Sawtooth oscillation behavior with varying amounts of applied stellarator rotational transform Article Swipe
J. L. Herfindal
,
D.A. Maurer
,
G.J. Hartwell
,
D.A. Ennis
,
J.D. Hanson
,
S. Knowlton
,
X. Ma
,
M. D. Pandya
,
Nicholas Roberds
,
P. Traverso
·
YOU?
·
· 2019
· Open Access
·
· DOI: https://doi.org/10.1063/1.5080242
YOU?
·
· 2019
· Open Access
·
· DOI: https://doi.org/10.1063/1.5080242
Tokamak-like sawtooth oscillations are observed in the Compact Toroidal Hybrid (CTH), a current-carrying stellarator. CTH has the unique ability to change the amount of the applied vacuum rotational transform from external stellarator coils relative to the rotational transform generated by the internal plasma current to investigate the effects of strong three-dimensional magnetic shaping on sawtooth behavior. The observed sawteeth in CTH, for plasmas with monotonically decreasing rotational transform profiles dominated by the plasma current, have characteristics of those observed on tokamaks including (1) a central emissivity rise and then a sudden crash with a well-defined inversion radius, (2) the presence of an m = 1 emissivity fluctuation, and (3) the normalized inversion surface radius scales with the total edge rotational transform. We explore the properties of an ensemble of discharges in CTH in which the fractional rotational transform, defined as the vacuum rotational transform divided by the total rotational transform, is systematically varied from 0.04 to 0.42 to observe changes in sawtooth oscillation dynamics. Over this range of the fractional rotational transform, the measured sawtooth period decreased by a factor of two. At a high fractional rotational transform, the sawtooth amplitude is observed to consist of only low-amplitude oscillations while the measured crash time of the sawtooth oscillation does not appear to have a strong dependence on the amount of the fractional transform applied. Experimental results indicate that the low-amplitude sawteeth are accompanied by a decrease in the sawtooth period and predominantly correlated with the mean elongation (due to the increasing fractional rotational transform) of the non-axisymmetric plasmas within CTH rather than other global equilibrium parameters.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1063/1.5080242
- OA Status
- green
- Cited By
- 4
- References
- 29
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W2919766425
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W2919766425Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1063/1.5080242Digital Object Identifier
- Title
-
Sawtooth oscillation behavior with varying amounts of applied stellarator rotational transformWork title
- Type
-
articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
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2019Year of publication
- Publication date
-
2019-03-01Full publication date if available
- Authors
-
J. L. Herfindal, D.A. Maurer, G.J. Hartwell, D.A. Ennis, J.D. Hanson, S. Knowlton, X. Ma, M. D. Pandya, Nicholas Roberds, P. TraversoList of authors in order
- Landing page
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https://doi.org/10.1063/1.5080242Publisher landing page
- Open access
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YesWhether a free full text is available
- OA status
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greenOpen access status per OpenAlex
- OA URL
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https://www.osti.gov/biblio/1501627Direct OA link when available
- Concepts
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Sawtooth wave, Physics, Tokamak, Stellarator, Oscillation (cell signaling), Gyroradius, Amplitude, Plasma, RADIUS, Atomic physics, Computational physics, Optics, Chemistry, Nuclear physics, Biochemistry, Computer security, Computer science, Computer visionTop concepts (fields/topics) attached by OpenAlex
- Cited by
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4Total citation count in OpenAlex
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2023: 1, 2022: 1, 2021: 2Per-year citation counts (last 5 years)
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29Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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