Observations of radially elongated particle flux induced by streamer in a linear magnetized plasma

Kin, Fumiyoshi; Fujisawa, A.; Itoh, K.; Kosuga, Y.; Sasaki, M.; Inagaki, S.; Nagashima, Yoshihiko; Yamada, Teppei; Kasuya, Naohiro; Yamasaki, K.; Hasamada, Kazunobu; Zhang, B. Y.; Kawachi, Yuichi; Arakawa, Hiroyuki; Kobayashi, Tatsuya; Itoh, Sanae I.

doi:10.1063/1.5093218

Cited by 14 publications

(8 citation statements)

References 24 publications

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“…31,34 This broadening in the f-m space is identical to the bunching of the fluctuation energy in the real space, which results in an azimuthally localized turbulent transport structure. 27 A dedicated comparison study of those experiments and a nonlinear fluid simulation also supports this interpretation. 35 Another coherent peak appears at ðf ; mÞ ¼ ð4:2 kHz; 1Þ, having a narrower spectral shape and a higher spectral peak than the m ¼ 2 drift wave.…”

Section: B Response In the Fluctuation Spectrummentioning

confidence: 63%

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Impact of helium neutral gas puff on plasma turbulence in linear magnetized argon plasmas

et al. 2020

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In order to explore the impact of the neutrals on the plasma turbulence, a new gas puff system is developed for a linear magnetized plasma column PANTA. Helium gas is injected into the argon plasma without changing the electron density profile. After the helium gas puff, the dominant fluctuation mode changes from the broadband m ¼ 2 drift wave to the coherent m ¼ 1 mode, where m is the azimuthal mode number. Accordingly, the property of the nonlinear coupling with other fluctuating modes changes from broadband couplings to coherent couplings.

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Section: B Response In the Fluctuation Spectrummentioning

confidence: 63%

“…With this discharge condition, the streamer structure is nonlinearly excited by drift waves. [24][25][26][27] In addition, drift waves also excite a sheared axial flow structure which secondarily drives the D'Angelo mode in the inner radii. 16,17 The helium gas injector is illustrated in Fig.…”

Section: Methodsmentioning

confidence: 99%

Impact of helium neutral gas puff on plasma turbulence in linear magnetized argon plasmas

et al. 2020

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“…26) The streamer is a radially elongated structure with the bunching in the azimuthal direction (self-azimuthal focusing), which enhances turbulence transport. 27) This fluctuation state is realized by the modulation of the carrier wave in the direction of wave propagation by nonlinear interaction. The Hankel-SP DMD can decompose these structures.…”

Section: Resultsmentioning

confidence: 99%

A new combination of Hankel and sparsity-promoting dynamic mode decompositions and its application to the prediction of plasma turbulence

Kusaba

Kuboyama

Shin

et al. 2021

Jpn. J. Appl. Phys.

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A new combined use of dynamic mode decomposition algorithms is proposed, which is suitable for the analysis of spatiotemporal data from experiments with few observation points, unlike computational fluid dynamics with many observation points. The method was applied to our data from a plasma turbulence experiment. As a result, we succeeded in constructing a quite accurate model for our training data and it made progress in predictive performance as well. In addition, modal patterns from the longer-term analysis help to understand the underlying mechanism more clearly, which is demonstrated in the case of plasma streamer structure. This method is expected to be a powerful tool for the data-driven construction of a reduced-order model and a predictor in plasma turbulence research and also any nonlinear dynamics researches of other applied physics fields.

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“…There were only a few experimental observations to suggest the signature of the streamers in toroidal plasma experiments. 94 , 95 ) On the other hand, the streamers were identified in a linear plasma, 96 – 98 ) and stimulated investigations of the fundamental processes of the streamers formation.…”

Section: Modern Issues In Turbulent Plasmamentioning

confidence: 99%

Review of plasma turbulence experiments

Fujisawa

2021

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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Understandings of turbulent plasma have been developed along with nuclear fusion research for more than a half century. Long international research has produced discoveries concerning turbulent plasma that allow us to notice the hidden nature and physics questions that could contribute to other scientific fields and the development of technologies. Guiding concepts have been established up to now that stimulate investigations on turbulent plasma. Research based on concepts concerning symmetry breaking and global linkage requires observing the entire field of plasma turbulence for an ultimate understanding of plasma. This article reviews the achievements as well as contemporary problems regarding turbulence experiments associated with strongly magnetized plasmas in the last and present century, and introduces forthcoming experimental issues, including new diagnostics and physics-oriented devices related to plasma turbulence.

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Observations of radially elongated particle flux induced by streamer in a linear magnetized plasma

Cited by 14 publications

References 24 publications

Impact of helium neutral gas puff on plasma turbulence in linear magnetized argon plasmas

Impact of helium neutral gas puff on plasma turbulence in linear magnetized argon plasmas

A new combination of Hankel and sparsity-promoting dynamic mode decompositions and its application to the prediction of plasma turbulence

Review of plasma turbulence experiments

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