Experimental study of particle transport and density fluctuations in LHD

K. Tanaka, C. Michael, A. L. Sanin, L. N. Vyacheslavov, K. Kawahata, S. Murakami, A. Wakasa, S. Okajima, H. Yamada, M. Shoji, J. Miyazawa, S. Morita, T. Tokuzawa, T. Akiyama, M. Goto, K. Ida, M. Yoshinuma, I. Yamada, M. Yokoyama, S. MasuzakiT. Morisaki, R. Sakamoto, H. Funaba, S. Inagaki, M. Kobayashi, A. Komori

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

A variety of electron density (ne) profiles have been observed in the Large Helical Device (LHD). The density profiles change dramatically with heating power and toroidal magnetic field (Bt). The particle transport coefficients, i.e. diffusion coefficient (D) and convection velocity (V) are experimentally obtained in the standard configuration from density modulation experiments. The values of D and V are estimated separately in the core and edge. The diffusion coefficients are found to be a function of electron temperature (Te), and vary with Bt. Edge diffusion coefficients are proportional to. Non-zero V is observed, and it is found that the electron temperature gradient can drive particle convection, particularly in the core region. The convection velocity both in the core and edge reverses direction from inward to outward as the Te gradient increases. However, the toroidal magnetic field also significantly affects the value and direction of V. The density fluctuation profiles are measured by a two-dimensional phase contrast interferometer. It was found that fluctuations which are localized in the edge propagate towards the ion diamagnetic direction in the laboratory frame, while the phase velocity of fluctuations around mid-radius is close to the plasma poloidal Er × Bt rotation velocity. The fluctuation level becomes larger as particle flux becomes larger in the edge region.

Original languageEnglish
Pages (from-to)110-122
Number of pages13
JournalNuclear Fusion
Volume46
Issue number1
DOIs
Publication statusPublished - Jan 1 2006
Externally publishedYes

Fingerprint

convection
diffusion coefficient
temperature gradients
electron energy
electron density profiles
phase contrast
profiles
flux (rate)
phase velocity
magnetic fields
interferometers
transport properties
modulation
heating
radii
configurations
ions

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Tanaka, K., Michael, C., Sanin, A. L., Vyacheslavov, L. N., Kawahata, K., Murakami, S., ... Komori, A. (2006). Experimental study of particle transport and density fluctuations in LHD. Nuclear Fusion, 46(1), 110-122. https://doi.org/10.1088/0029-5515/46/1/013

Experimental study of particle transport and density fluctuations in LHD. / Tanaka, K.; Michael, C.; Sanin, A. L.; Vyacheslavov, L. N.; Kawahata, K.; Murakami, S.; Wakasa, A.; Okajima, S.; Yamada, H.; Shoji, M.; Miyazawa, J.; Morita, S.; Tokuzawa, T.; Akiyama, T.; Goto, M.; Ida, K.; Yoshinuma, M.; Yamada, I.; Yokoyama, M.; Masuzaki, S.; Morisaki, T.; Sakamoto, R.; Funaba, H.; Inagaki, S.; Kobayashi, M.; Komori, A.

In: Nuclear Fusion, Vol. 46, No. 1, 01.01.2006, p. 110-122.

Research output: Contribution to journalArticle

Tanaka, K, Michael, C, Sanin, AL, Vyacheslavov, LN, Kawahata, K, Murakami, S, Wakasa, A, Okajima, S, Yamada, H, Shoji, M, Miyazawa, J, Morita, S, Tokuzawa, T, Akiyama, T, Goto, M, Ida, K, Yoshinuma, M, Yamada, I, Yokoyama, M, Masuzaki, S, Morisaki, T, Sakamoto, R, Funaba, H, Inagaki, S, Kobayashi, M & Komori, A 2006, 'Experimental study of particle transport and density fluctuations in LHD', Nuclear Fusion, vol. 46, no. 1, pp. 110-122. https://doi.org/10.1088/0029-5515/46/1/013
Tanaka K, Michael C, Sanin AL, Vyacheslavov LN, Kawahata K, Murakami S et al. Experimental study of particle transport and density fluctuations in LHD. Nuclear Fusion. 2006 Jan 1;46(1):110-122. https://doi.org/10.1088/0029-5515/46/1/013
Tanaka, K. ; Michael, C. ; Sanin, A. L. ; Vyacheslavov, L. N. ; Kawahata, K. ; Murakami, S. ; Wakasa, A. ; Okajima, S. ; Yamada, H. ; Shoji, M. ; Miyazawa, J. ; Morita, S. ; Tokuzawa, T. ; Akiyama, T. ; Goto, M. ; Ida, K. ; Yoshinuma, M. ; Yamada, I. ; Yokoyama, M. ; Masuzaki, S. ; Morisaki, T. ; Sakamoto, R. ; Funaba, H. ; Inagaki, S. ; Kobayashi, M. ; Komori, A. / Experimental study of particle transport and density fluctuations in LHD. In: Nuclear Fusion. 2006 ; Vol. 46, No. 1. pp. 110-122.
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AU - Murakami, S.

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