Density collapse and fluctuation observed in poloidally rotating plasma on TU-Heliac

Yutaka Tanaka; Sumio Kitajima; Mamiko Sasao; Hiroyasu Utoh; Hiroshi Aoyama; Keisuke Iwazaki; Hajime Umetsu; Keiichi Ishii; Atsushi Okamoto; Takashi Kobuchi; Shigeru Inagaki; Yasuhiro Suzuki; Hiromi Takahashi

doi:10.1585/pfr.3.S1055

Density collapse and fluctuation observed in poloidally rotating plasma on TU-Heliac

Yutaka Tanaka, Sumio Kitajima, Mamiko Sasao, Hiroyasu Utoh, Hiroshi Aoyama, Keisuke Iwazaki, Hajime Umetsu, Keiichi Ishii, Atsushi Okamoto, Takashi Kobuchi, Shigeru Inagaki, Yasuhiro Suzuki, Hiromi Takahashi

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

The ohmic heated plasma in TU-Heliac was biased by a hot-cathode to drive E × B poloidal rotation. Coincident measurements of the line density and ion saturation currents revealed the existence of density collapse accompanied by fluctuation in the poloidally rotating plasma. The radial density profiles just before and after the collapse were estimated. The steep density gradient vanished with the density collapse. The power spectra of the fluctuation were calculated from the ion saturation current obtained with a high-speed triple probe. The frequency of fluctuation was compared to the E × B poloidal rotation frequency, where the fluctuation appeared with density collapse. The fluctuation frequency was 2 to 3 times the rotation frequency. This suggested that the poloidal mode number of fluctuation was m =2 or 3.

Original language	English
Article number	S1055
Journal	Plasma and Fusion Research
Volume	3
DOIs	https://doi.org/10.1585/pfr.3.S1055
Publication status	Published - 2008

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1585/pfr.3.S1055

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title = "Density collapse and fluctuation observed in poloidally rotating plasma on TU-Heliac",

abstract = "The ohmic heated plasma in TU-Heliac was biased by a hot-cathode to drive E × B poloidal rotation. Coincident measurements of the line density and ion saturation currents revealed the existence of density collapse accompanied by fluctuation in the poloidally rotating plasma. The radial density profiles just before and after the collapse were estimated. The steep density gradient vanished with the density collapse. The power spectra of the fluctuation were calculated from the ion saturation current obtained with a high-speed triple probe. The frequency of fluctuation was compared to the E × B poloidal rotation frequency, where the fluctuation appeared with density collapse. The fluctuation frequency was 2 to 3 times the rotation frequency. This suggested that the poloidal mode number of fluctuation was m =2 or 3.",

author = "Yutaka Tanaka and Sumio Kitajima and Mamiko Sasao and Hiroyasu Utoh and Hiroshi Aoyama and Keisuke Iwazaki and Hajime Umetsu and Keiichi Ishii and Atsushi Okamoto and Takashi Kobuchi and Shigeru Inagaki and Yasuhiro Suzuki and Hiromi Takahashi",

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doi = "10.1585/pfr.3.S1055",

language = "English",

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journal = "Plasma and Fusion Research",

issn = "1880-6821",

publisher = "The Japan Society of Plasma Science and Nuclear Fusion Research (JSPF)",

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T1 - Density collapse and fluctuation observed in poloidally rotating plasma on TU-Heliac

AU - Tanaka, Yutaka

AU - Kitajima, Sumio

AU - Sasao, Mamiko

AU - Utoh, Hiroyasu

AU - Aoyama, Hiroshi

AU - Iwazaki, Keisuke

AU - Umetsu, Hajime

AU - Ishii, Keiichi

AU - Okamoto, Atsushi

AU - Kobuchi, Takashi

AU - Inagaki, Shigeru

AU - Suzuki, Yasuhiro

AU - Takahashi, Hiromi

PY - 2008

Y1 - 2008

N2 - The ohmic heated plasma in TU-Heliac was biased by a hot-cathode to drive E × B poloidal rotation. Coincident measurements of the line density and ion saturation currents revealed the existence of density collapse accompanied by fluctuation in the poloidally rotating plasma. The radial density profiles just before and after the collapse were estimated. The steep density gradient vanished with the density collapse. The power spectra of the fluctuation were calculated from the ion saturation current obtained with a high-speed triple probe. The frequency of fluctuation was compared to the E × B poloidal rotation frequency, where the fluctuation appeared with density collapse. The fluctuation frequency was 2 to 3 times the rotation frequency. This suggested that the poloidal mode number of fluctuation was m =2 or 3.

AB - The ohmic heated plasma in TU-Heliac was biased by a hot-cathode to drive E × B poloidal rotation. Coincident measurements of the line density and ion saturation currents revealed the existence of density collapse accompanied by fluctuation in the poloidally rotating plasma. The radial density profiles just before and after the collapse were estimated. The steep density gradient vanished with the density collapse. The power spectra of the fluctuation were calculated from the ion saturation current obtained with a high-speed triple probe. The frequency of fluctuation was compared to the E × B poloidal rotation frequency, where the fluctuation appeared with density collapse. The fluctuation frequency was 2 to 3 times the rotation frequency. This suggested that the poloidal mode number of fluctuation was m =2 or 3.

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JO - Plasma and Fusion Research

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ER -

Density collapse and fluctuation observed in poloidally rotating plasma on TU-Heliac

Abstract

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