Measurement of fluctuations in the supersonic poloidal flow driven by a hot cathode

Y. Tanaka, H. Takahashi, H. Utoh, J. Shinde, M. Ogawa, K. Iwazaki, H. Aoyama, A. Okamoto, K. Shinto, S. Kitajima, M. Yokoyama, Inagaki Shigeru, Y. Suzuki, K. Nishimura, M. Sasao

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The density and potential fluctuations were measured in hot-cathode biasing plasma at the Tohoku University Heliac. In the improved mode, high-frequency fluctuations (>100 kHz) appeared in the density signal. On the other hand, low-frequency fluctuations (<100 kHz) in the density and potential signals were suppressed. The characteristics of high-frequency fluctuation were compared with three kinds of instability, and they were consistent with those of the flute instability driven by the supersonic poloidal rotation. The suppression of low-frequency fluctuations in improved mode is considered the effect of E × B poloidal rotation or its shear. The profile of the anomalous particle flux was estimated by analysing the low-frequency fluctuation signals. The flux decreased in the improved mode in most of the region, although the decrease in flux was small near the rational surface (n/m = 5/3).

Original languageEnglish
JournalPlasma Physics and Controlled Fusion
Volume48
Issue number5 A
DOIs
Publication statusPublished - May 1 2006

Fingerprint

hot cathodes
Supersonic flow
Cathodes
Fluxes
low frequencies
Plasmas
flux (rate)
retarding
shear
profiles

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Tanaka, Y., Takahashi, H., Utoh, H., Shinde, J., Ogawa, M., Iwazaki, K., ... Sasao, M. (2006). Measurement of fluctuations in the supersonic poloidal flow driven by a hot cathode. Plasma Physics and Controlled Fusion, 48(5 A). https://doi.org/10.1088/0741-3335/48/5A/S27

Measurement of fluctuations in the supersonic poloidal flow driven by a hot cathode. / Tanaka, Y.; Takahashi, H.; Utoh, H.; Shinde, J.; Ogawa, M.; Iwazaki, K.; Aoyama, H.; Okamoto, A.; Shinto, K.; Kitajima, S.; Yokoyama, M.; Shigeru, Inagaki; Suzuki, Y.; Nishimura, K.; Sasao, M.

In: Plasma Physics and Controlled Fusion, Vol. 48, No. 5 A, 01.05.2006.

Research output: Contribution to journalArticle

Tanaka, Y, Takahashi, H, Utoh, H, Shinde, J, Ogawa, M, Iwazaki, K, Aoyama, H, Okamoto, A, Shinto, K, Kitajima, S, Yokoyama, M, Shigeru, I, Suzuki, Y, Nishimura, K & Sasao, M 2006, 'Measurement of fluctuations in the supersonic poloidal flow driven by a hot cathode', Plasma Physics and Controlled Fusion, vol. 48, no. 5 A. https://doi.org/10.1088/0741-3335/48/5A/S27
Tanaka, Y. ; Takahashi, H. ; Utoh, H. ; Shinde, J. ; Ogawa, M. ; Iwazaki, K. ; Aoyama, H. ; Okamoto, A. ; Shinto, K. ; Kitajima, S. ; Yokoyama, M. ; Shigeru, Inagaki ; Suzuki, Y. ; Nishimura, K. ; Sasao, M. / Measurement of fluctuations in the supersonic poloidal flow driven by a hot cathode. In: Plasma Physics and Controlled Fusion. 2006 ; Vol. 48, No. 5 A.
@article{66caac7ca500454584d6ad7a233c7e4e,
title = "Measurement of fluctuations in the supersonic poloidal flow driven by a hot cathode",
abstract = "The density and potential fluctuations were measured in hot-cathode biasing plasma at the Tohoku University Heliac. In the improved mode, high-frequency fluctuations (>100 kHz) appeared in the density signal. On the other hand, low-frequency fluctuations (<100 kHz) in the density and potential signals were suppressed. The characteristics of high-frequency fluctuation were compared with three kinds of instability, and they were consistent with those of the flute instability driven by the supersonic poloidal rotation. The suppression of low-frequency fluctuations in improved mode is considered the effect of E × B poloidal rotation or its shear. The profile of the anomalous particle flux was estimated by analysing the low-frequency fluctuation signals. The flux decreased in the improved mode in most of the region, although the decrease in flux was small near the rational surface (n/m = 5/3).",
author = "Y. Tanaka and H. Takahashi and H. Utoh and J. Shinde and M. Ogawa and K. Iwazaki and H. Aoyama and A. Okamoto and K. Shinto and S. Kitajima and M. Yokoyama and Inagaki Shigeru and Y. Suzuki and K. Nishimura and M. Sasao",
year = "2006",
month = "5",
day = "1",
doi = "10.1088/0741-3335/48/5A/S27",
language = "English",
volume = "48",
journal = "Plasma Physics and Controlled Fusion",
issn = "0741-3335",
publisher = "IOP Publishing Ltd.",
number = "5 A",

}

TY - JOUR

T1 - Measurement of fluctuations in the supersonic poloidal flow driven by a hot cathode

AU - Tanaka, Y.

AU - Takahashi, H.

AU - Utoh, H.

AU - Shinde, J.

AU - Ogawa, M.

AU - Iwazaki, K.

AU - Aoyama, H.

AU - Okamoto, A.

AU - Shinto, K.

AU - Kitajima, S.

AU - Yokoyama, M.

AU - Shigeru, Inagaki

AU - Suzuki, Y.

AU - Nishimura, K.

AU - Sasao, M.

PY - 2006/5/1

Y1 - 2006/5/1

N2 - The density and potential fluctuations were measured in hot-cathode biasing plasma at the Tohoku University Heliac. In the improved mode, high-frequency fluctuations (>100 kHz) appeared in the density signal. On the other hand, low-frequency fluctuations (<100 kHz) in the density and potential signals were suppressed. The characteristics of high-frequency fluctuation were compared with three kinds of instability, and they were consistent with those of the flute instability driven by the supersonic poloidal rotation. The suppression of low-frequency fluctuations in improved mode is considered the effect of E × B poloidal rotation or its shear. The profile of the anomalous particle flux was estimated by analysing the low-frequency fluctuation signals. The flux decreased in the improved mode in most of the region, although the decrease in flux was small near the rational surface (n/m = 5/3).

AB - The density and potential fluctuations were measured in hot-cathode biasing plasma at the Tohoku University Heliac. In the improved mode, high-frequency fluctuations (>100 kHz) appeared in the density signal. On the other hand, low-frequency fluctuations (<100 kHz) in the density and potential signals were suppressed. The characteristics of high-frequency fluctuation were compared with three kinds of instability, and they were consistent with those of the flute instability driven by the supersonic poloidal rotation. The suppression of low-frequency fluctuations in improved mode is considered the effect of E × B poloidal rotation or its shear. The profile of the anomalous particle flux was estimated by analysing the low-frequency fluctuation signals. The flux decreased in the improved mode in most of the region, although the decrease in flux was small near the rational surface (n/m = 5/3).

UR - http://www.scopus.com/inward/record.url?scp=34247539214&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34247539214&partnerID=8YFLogxK

U2 - 10.1088/0741-3335/48/5A/S27

DO - 10.1088/0741-3335/48/5A/S27

M3 - Article

AN - SCOPUS:34247539214

VL - 48

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 5 A

ER -