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Active control of internal transport barrier formation due to off-axis electron-cyclotron heating in GAMMA 10 experiments

Phys. Plasmas 15, 056120 (2008); doi:10.1063/1.2906262

Published 7 May 2008

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T. Cho, V. P. Pastukhov, W. Horton, T. Numakura, M. Hirata, J. Kohagura, N. V. Chudin, and J. Pratt
Plasma Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
The controlled formation of an internal transport barrier (ITB) is observed in GAMMA 10 [T. Cho et al., Nucl. Fusion 45, 1650 (2005)]. The barrier is localized within a layer of a strongly sheared Er×B plasma rotation (5.5<rc<=10  cm). This high-vorticity layer is formed and maintained by off-axis electron-cyclotron heating, which generates a cylindrical layer (4<rc<7  cm) with a high-energy electron population that modifies the initial Gaussian radial potential profile into a nonmonotonic one with a hump structure. The local gradients of Ti and Te are appreciably enhanced in the ITB layer, similarly to those of the ITB in tokamaks and stellarators. Reductions in the effective ion and electron thermal diffusivities are obtained in the barrier layer. A reduction of the observed low-frequency turbulence in the ITB layer and a partial decoupling of the turbulent structures localized on either side of the layer are demonstrated by two-dimensional x-ray diagnostics. ©2008 American Institute of Physics
History: Received 13 November 2007; accepted 17 March 2008; published 7 May 2008
Permalink: http://link.aip.org/link/?PHPAEN/15/056120/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.25.Fi
    Plasma transport properties
  • 52.55.Jd
    Magnetic mirrors, gas dynamic traps
  • 52.30.-q
    Plasma dynamics and flow
  • 52.70.La
    X-ray and γ-ray plasma diagnostic measurements
  • 52.50.Gj
    Plasma heating by particle beams
  • 52.35.Ra
    Plasma turbulence
  • YEAR: 2008

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ISSN:
1070-664X (print)   1089-7674 (online)
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REFERENCES (30)
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  1. M. L. Watkins and JET EFDA Contributors, in Proceedings of the International Atomic Energy Agency (IAEA) Fusion Energy Conference, Chengdu, 2006 (IAEA, Vienna, 2006), Paper No. IAEA-CN-149/OV/1-3;
  2. M. R. Wade and DIII-D TeamProceedings of the International Atomic Energy Agency (IAEA) Fusion Energy Conference, ibid., Paper No. IAEA-CN-149/OV/1-4.
  3. T. Shimozuma, S. Kubo, H. Idei, S. Inagaki1, N. Tamura1, T. Tokuzawa, T. Morisaki, K. Y. Watanabe, K. Ida, I. Yamada, K. Narihara, S. Muto, M. Yokoyama, Y. Yoshimura, T. Notake, K. Ohkubo, T. Seki, K. Saito, R. Kumazawa, T. Mutoh, T. Watari, A. Komori, and the LHD Experimental Group, Nucl. Fusion 45, 1396 (2005).
  4. T. Cho, M. Yoshida, J. Kohagura, M. Hirata, T. Numakura, H. Higaki, H. Hojo, M. Ichimura, K. Ishii, K. Md. Islam, A. Itakura, I. Katanuma, Y. Nakashima, T. Saito, Y. Tatematsu, M. Yoshikawa, Y. Kojima, S. Tokioka, N. Yokoyama, Y. Tomii, T. Imai, V. P. Pastukhov, S. Miyoshi, and GAMMA 10 Group, Phys. Rev. Lett. 94, 085002 (2005).
  5. T. Cho, J. Kohagura, M. Hirata, T. Numakura, H. Higaki, H. Hojo, M. Ichimura, K. Ishii, K. Md. Islam, A. Itakura, I. Katanuma, Y. Nakashima, T. Saito, Y. Tatematsu, M. Yoshikawa, Y. Takemura, A. Kojima, T. Kobayashi, Y. Yamaguchi, Y. Miyata, N. Yokoyama, Y. Tomii, Y. Miyake, S. Kiminami, K. Shimizu, Y. Kubota, H. Saimaru, Y. Higashizono, A. Mase, Y. Yasaka, K. Ogura, K. Sakamoto, M. Yoshida, V. P. Pastukhov, T. Imai, S. Miyoshi, and GAMMA 10 Group, Nucl. Fusion 45, 1650 (2005).
  6. T. Cho, J. Kohagura, T. Numakura, M. Hirata, H. Higaki, H. Hojo, M. Ichimura, K. Ishii, K. Md. Islam, A. Itakura, I. Katanuma, R. Minami, Y. Nakashima, T. Saito, Y. Tatematsu, O. Watanabe, M. Yoshikawa, A. Kojima, Y. Miyake, Y. Miyata, K. Shimizu, Y. Tomii, M. Yoshida, K. Sakamoto, T. Imai, V. P. Pastukhov, S. Miyoshi, and GAMMA 10 Group, Phys. Rev. Lett. 97, 055001 (2006).
  7. T. Cho, H. Higaki, M. Hirata, H. Hojo, M. Ichimura, K. Ishii, K. Md. Islam, A. Itakura, I. Katanuma, J. Kohagura, R. Minami, Y. Nakashima, T. Numakura, T. Saito, Y. Tatematsu, M. Yoshikawa, O. Watanabe, Y. Kubota, T. Kobayashi, Y. Yamaguchi, Y. Higashizono, Y. Miyata, H. Saimaru, A. Mase, Y. Yasaka, A. Kojima, M. Yoshida, W. Horton, T. Imai, V. P. Pastukhov, S. Miyoshi, and GAMMA 10 Group, in Proceedings of the International Atomic Energy Agency (IAEA) Fusion Energy Conference, Chengdu, 2006 (IAEA, Vienna, 2006), Paper No. IAEA-CN-149/EX/P7-14.
  8. P. W. Terry, Rev. Mod. Phys. 72, 109 (2000).
  9. P. H. Diamond, S. I. Itoh, K. Itoh, and T. S. Hahm, Plasma Phys. Controlled Fusion 47, R35 (2005).
  10. F. Wagner, G. Becker, K. Behringer, D. Campbell, A. Eberhagen, W. Engelhardt, G. Fussmann, O. Gehre, J. Gernhardt, G. v. Gierke, G. Haas, M. Huang, F. Karger, M. Keilhacker, O. Klüber, M. Kornherr, K. Lackner, G. Lisitano, G. G. Lister, H. M. Mayer, D. Meisel, E. R. Müller, H. Murmann, H. Niedermeyer, W. Poschenrieder, H. Rapp, H. Röhr, F. Schneider, G. Siller, E. Speth, A. Stäbler, K. H. Steuer, G. Venus, O. Vollmer, and Z. Yü, Phys. Rev. Lett. 49, 1408 (1982).
  11. E. J. Strait, L. L. Lao, M. E. Mauel, B. W. Rice, T. S. Taylor, K. H. Burrell, M. S. Chu, E. A. Lazarus, T. H. Osborne, S. J. Thompson, and A. D. Turnbull, Phys. Rev. Lett. 75, 4421 (1995).
  12. C. M. Greenfield, B. Balet, K. H. Burrell, M. S. Chu, J. G. Cordey, J. C. Deboo, N. Deliyanakis, E. J. Doyle, R. J. Groebner, G. L. Jackson, S. Konoshima, D. P. Obrien, L. Porte, C. L. Rettig, T. H. Osborne, H. St. John, A. C. C. Sips, G. M. Staebler, E. J. Strait, P. M. Stubberfield, T. S. Taylor, S. J. Thompson, K. Thomsen, and A. D. Turnbull, Plasma Phys. Controlled Fusion 35, B263 (1993).
  13. A. Mase, A. Itakura, M. Inutake, K. Ishii, J. H. Jeong, K. Hattori, and S. Miyoshi, Nucl. Fusion 31, 1725 (1991).
  14. M. Hirata, T. Cho, E. Takahashi, N. Yamaguchi, T. Kondoh, K. Matsuda, S. Aoki, K. Tanaka, H. Maezawa, and S. Miyoshi, Nucl. Instrum. Methods Phys. Res. B 66, 479 (1992).
  15. T. Numakura, T. Cho, J. Kohagura, M. Hirata, R. Minami, M. Yoshida, Y. Nakashima, T. Tamano, K. Yatsu, and S. Miyoshi, Plasma Phys. Controlled Fusion 45, 807 (2003).
  16. J. Kohagura, T. Cho, M. Hirata, T. Tamano, K. Yatsu, and S. Miyoshi, Phys. Rev. E 56, 5884 (1997).
  17. R. Minami, T. Cho, J. Kohagura, M. Hirata, T. Numakura, H. Watanabe, M. Yoshida, Y. Nakashima, M. Ichimura, T. Tamano, K. Yatsu, and S. Miyoshi, Plasma Phys. Controlled Fusion 44, 1363 (2002).
  18. K. Ishii, M. Kotoku, T. Segawa, I. Katanuma, A. Mase, and S. Miyoshi, Rev. Sci. Instrum. 60, 3270 (1989).
  19. M. Yoshida, T. Cho, M. Hirata, H. Ito, J. Kohagura, K. Yatsu, and S. Miyoshi, Rev. Sci. Instrum. 74, 1909 (2003).
  20. T. Cho, M. Inutake, K. Ishii, I. Katanuma, Y. Kiwamoto, A. Mase, Y. Nakashima, T. Saito, N. Yamaguchi, K. Yatsu, M. Hirata, T. Kondoh, H. Sugawara, J. H. Foote, and S. Miyoshi, Nucl. Fusion 28, 2187 (1988).
  21. T. Cho, J. Kohagura, T. Numakura, M. Hirata, H. Hojo, M. Ichimura, K. Ishii, A. Itakura, I. Katanuma, Y. Nakashima, T. Saito, Y. Tatematsu, M. Yoshikawa, R. Minami, S. Nagashima, M. Yoshida, T. Tamano, K. Yatsu, and S. Miyoshi, Phys. Rev. Lett. 86, 4310 (2001);
    22. T. Cho, M. Hirata, K. Ogura, E. Takahashi, T. Kondoh, N. Yamaguchi, K. Masai, K. Hayashi, I. Katanuma, K. Ishii, T. Saito, Y. Kiwamoto, K. Yatsu, and S. Miyoshi, ibid. 64, 1373 (1990).
  22. W. H. Press, W. T. Vetterling, S. A. Teukolsky, and B. P. Flannery, in Numerical Recipes in C (Cambridge University Press, Cambridge, 1988).
  23. W. Horton, J. C. Perez, T. Carter, and R. Bengtson, Phys. Plasmas 12, 022303 (2005);
    24. W. Horton, B. Hu, J. Q. Dong, and P. Zhu, New J. Phys. 5, 14.1 (2003);
    J. C. Perez, W. Horton, R. D. Bengtson, and T. Cartere, Phys. Plasmas 13, 055701 (2006).
  24. A. M. Batista, I. L. Caldas, S. R. Lopes, R. L. Viana, W. Horton, and P. J. Morrison, Phys. Plasmas 13, 042510 (2006).
  25. T. Numakura, T. Cho, J. Kohagura, M. Hirata, Y. Tomii, S. Kiminami, K. Shimizu, N. Morimoto, Y. Takahashi, T. Imai, and S. Miyoshi, Nucl. Instrum. Methods Phys. Res. A 573, 53 (2007).
  26. J. H. Foote and G. D. Porter, Plasma Phys. Controlled Fusion 31, 255 (1989).
  27. P. R. Bevington, in Data Reduction and Error Analysis for the Physical Sciences (McGraw-Hill, New York, 1969).
  28. I. Katanuma, Y. Kiwamoto, S. Adachi, M. Inutake, K. Ishii, K. Yatsu, K. Sawada, and S. Miyoshi, Nucl. Fusion 27, 2041 (1987).
  29. S. I. Braginskii, in Reviews of Plasma Physics, edited by M. A. Leontovich (Consultants Bureau, New York, 1965), Vol. 1.
  30. V. P. Pastukhov, Plasma Phys. Rep. 31, 577 (2005).
  31. V. P. Pastukhov and N. V. Chudin, Fusion Sci. Technol. 51, 34 (2007).

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