Observations of Intermittent Structures in the Periphery of a Cylindrical Linear Plasma in PANTA

Ohyama, Noriko; Fujisawa, A.; Inagaki, S.; Nagashima, Yoshihiko; Oldenbürger, S.; Kobayashi, Tatsuya; K, Kawashima; Tobimatsu, Y.; Yamashita, Tetsuo; Yamada, Suguru; Arakawa, Hiroyuki; Yamada, Teppei; Yagi, M.; Kasuya, Naohiro; Sasaki, M.; Itoh, Sanae I.; Itoh, K.

doi:10.1585/pfr.7.1201025

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…Blobs or intermittent radial transport in PISCES-A, 12,13) NAGDIS-II, 14,15) ULS, 16) LAPD, 17) and TPD-Sheet IV 18) emerged on the surface of cylindrical plasma with arc discharge sources. Similar phenomena were also observed in RF plasma sources, PANTA, 19) VINETA 20,21) and in the loss-cone of the GAMMA10/PDX mirror machine. 22) Early stages of these are reviewed in Ref.…”

Section: Introductionsupporting

confidence: 72%

Structure of intermittent variation of floating potential in a converging field following a magnetic beach ECR plasma source

Okamoto

Higuchi

Yamada

et al. 2023

Jpn. J. Appl. Phys.

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In converging field configuration of cylindrical plasma following electron cyclotron resonance plasma source, intermittent variation of floating potential, which is a negative spike with about ten microsecond duration, is observed. The event is ubiquitous; independent of measurement position and magnetic field. Cross correlation analysis for two floating potentials at separate positions reveals that strong correlation exists within the event timescale. The correlation along the magnetic field line suggests axially elongated structure. Radial extent of the structure is clarified by the radial correlation profile. Different FWHM of the radial profile at the plasma production region and the downstream converging field region is essentially explained by field line tracing.

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Section: Introductionsupporting

confidence: 72%

Structure of intermittent variation of floating potential in a converging field following a magnetic beach ECR plasma source

Okamoto

Higuchi

Yamada

et al. 2023

Jpn. J. Appl. Phys.

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“…It should be noted that the density modulation plays a fundamental role in driving the streamer structure. 31 The radial distribution of the ion saturation current is measured with a radially scannable fivechannel radial rake probe installed at z ¼ 1.375 m. 32 The radial rake probe has a spacing of Dr ¼ 1 cm. In a series of two discharges with 0.5 cm radial displacement of the rake probe position, the radial range from r ¼ 2 cm to r ¼ 6.5 cm is measured with a radial resolution of Dr ¼ 0:5 cm.…”

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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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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“…The probe tips measure the ion saturation current and the floating potential alternately, although only the ion saturation current data is analyzed in the article. The radial profile of the ion saturation current is measured with a 5-channel radial rake probe installed at z = 1.625 m [28]. The radial rake probe covers from r = 2 cm to r = 6 cm with a spacing of Δr = 1 cm.…”

Section: Methodsmentioning

confidence: 99%

Phenomenological Classification of Turbulence States in Linear Magnetized Plasma PANTA

Kobayashi

Inagaki

Sasaki

et al. 2017

Plasma and Fusion Research

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Changing the experimental conditions such as the neutral pressure and the magnetic field strength provides a drastic change in the turbulence states in linear magnetized helicon plasmas. In order to define the turbulence states and their occurrence region a throughout parameter scan in the two-dimensional parameter space was performed. The classification of the turbulence states is carried out phenomenologically based on the turbulence spectrum and the waveform.

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Observations of Intermittent Structures in the Periphery of a Cylindrical Linear Plasma in PANTA

Cited by 7 publications

References 9 publications

Structure of intermittent variation of floating potential in a converging field following a magnetic beach ECR plasma source

Structure of intermittent variation of floating potential in a converging field following a magnetic beach ECR plasma source

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

Phenomenological Classification of Turbulence States in Linear Magnetized Plasma PANTA

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