[Table of Contents]

Plasma and Fusion Research

Volume 5, S2078 (2010)

Regular Articles


Properties of Intermittent Bursts in Edge Plasma of LHD
Hayato TSUCHIYA, Tomohiro MORISAKI, Viatcheslav P. BUDAEV1), Akio KOMORI, Hiroshi YAMADA and LHD Experimental Group
National Institute for Fusion Science, Toki 509-5292, Japan
1)
Nuclear Fusion Institute, RRC Kurchatov Institute, 123182, Kurchatov Sq.1, Moscow, Russia
(Received 5 January 2010 / Accepted 16 March 2010 / Published 10 December 2010)

Abstract

In edge plasma in the Large Helical Device (LHD), incoherent fluctuations with intermittent density bursts were observed with a two-dimensional lithium beam probe that can measure electron density and its fluctuation two-dimensionally. Statistical analysis using a probability denstiy function (PDF) showed that those bursts have the characteristics of blobs, which have been observed in tokamaks. Two-dimensional PDF analysis indicates that the blobs originate in the ergodic layer outside the last closed flux surface and move to the outer region. Wavelet analysis showed that the direction of blob propagation is not always outward but is sometimes in arbitrary directions. These characteristics may be a result of the complicated magnetic field structure of the heliotron configuration.


Keywords

intermittent transport, blob, LHD, edge plasma

DOI: 10.1585/pfr.5.S2078


References

  • [1] S. I. Krasheninnikov, Phys. Lett. A 283, 368 (2001).
  • [2] J. A. Boedo, D. Rudakov, R. Moyer, S. Krasheninnikov, D. Whyte, G. McKee, G. Tynan, M. Schaffer, P. Stangeby, P. West, S. Allen, T. Evans, R. Fonck, E. Hollmann, A. Leonard, A. Mahdavi, G. Porter, M. Tillack and G. Antar, Phys. Plasmas 8, 4826 (2001).
  • [3] D. A. D'Ippolito, J. R. Myra and S. I. Krasheninnikov, Phys. Plasmas 9, 222 (2002).
  • [4] O. Grulke, J. L. Terry, B. LaBombard and S. J. Zweben, Phys. Plasmas 13, 012306 (2006).
  • [5] D. A. Russell, D. A. D'Ippolito, J. R. Myra, W. M. Nevins and X. Q. Xu, Phys. Rev. Lett. 93, 265001 (2004).
  • [6] V. Rozhansky, I. Senichenkov and I. Veselova, Phys. Plasmas 14, 052309 (2007).
  • [7] N. Nishino, Nucl. Fusion 46, S658 (2006).
  • [8] O. E. Garcia, N. H. Bian and W. Fundamenski, Phys. Plasmas 13, 082309 (2006).
  • [9] G. Q. Yu, S. I. Krasheninnikov and P. N. Guzdar, Phys. Plasmas 13, 042508 (2006).
  • [10] C. Hidalgo et al., C. R. Physique 7, 679 (2006).
  • [11] Y. Takahashi, T. Morisaki, K. Toi and LHD Experimental Group, J. Plasma Fusion Res. 1, 103 (2006).
  • [12] Y. Takahashi, T. Morisaki, K. Toi and LHD Experimental Group, J. Korean Phys. Soc. 49, S175 (2006).
  • [13] H. Tsuchiya, T. Morisaki, A. Komori and O. Motojima, Rev. Sci. Instrum. 77, 10F526 (2006).
  • [14] H. Tsuchiya, T. Morisaki, A. Komori, Y. Takahashi, K. Toi, H. Zushi, O. Motojima and LHD Experimental Group, Plasma Fusion Res. 2, S1096 (2007).
  • [15] O. Motojima et al., Nucl. Fusion 47, S668 (2007).
  • [16] G. Y. Antar, G. Counsell, Y. Yu, B. Labombard and P. Devynck, Phys. Plasmas 10, 419 (2003).
  • [17] H. Miyoshi, N. Ohno, S. Takamura, V. P. Budaev, Y. Uesugi, N. Asakura, Y. Miura, S. Masuzaki and A. Komori, Proceedings, 31st EPS Conference on Plasma Phys., London, 2004 Vol. 28G, P-5.101.
  • [18] N. Ohno, S. Masuzaki, H. Miyoshi, S. Takamura, V. P. Budaev, T. Morisaki, N. Ohyabu, A. Komori et al., Contrib. Plamsa Phys. 46, 692 (2006).
  • [19] T. A. Carter, Phys. Plasmas 13, 10701 (2006).
  • [20] V. P. Budaev, I. M. Pankratov, S. Takamura, N. Ohno, M. Takagi, H. Matsuno, M. Okamoto and S. K. Saha, Nucl. Fusion 46, S175 (2006).

This paper may be cited as follows:

Hayato TSUCHIYA, Tomohiro MORISAKI, Viatcheslav P. BUDAEV, Akio KOMORI, Hiroshi YAMADA and LHD Experimental Group, Plasma Fusion Res. 5, S2078 (2010).