Instability in the Frequency Range of Alfven Eigenmodes Driven by Negative-Ion-Based Neutral Beams in JT-60U

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Author(s)

Abstract

Alfvén eignemode experiments have been carried out by using the negative-ion-based neutral beam in JT-60U. For bursting instabilities in the frequency range of Alfvn Eigenmodes, two types of mode activity have been observed. In one type called Abrupt Large-amplitude Event (ALE), enhanced transport of the energetic ions was detected. The enhanced transport showed the clear energy dependence based on measurements performed using a natural diamond detector. In another type of bursting event called the fast Frequency Sweeping (fast FS) mode, frequency up-down chirping is observed on the time-scale of a few ms, much faster than equilibrium changes in the background plasma. This frequency chirping was well reproduced by the non-linear simulation code, MEGA, for magnetohydrodynamics (MHD) with energetic particles. The slow up-frequency sweeping of the Reversed-Shear-induced Alfvén Eigenmode (RSAEs), due to the slow evolution of qmin was also observed. These experiments were analyzed by using the NOVA-K code. It is shown that the most unstable modes are localized around the minimum in the magnetic safety factor (qmin) in the analysis.

Journal

  • Journal of Plasma and Fusion Research

    Journal of Plasma and Fusion Research 81(7), 547-552, 2005-07-25

    The Japan Society of Plasma Science and Nuclear Fusion Research

References:  32

  • <no title>

    SIGMAR D. J.

    Phys. Fluids B 4, 1506, 1992

    Cited by (3)

  • <no title>

    WONG K. L.

    8th IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems, 2003, 2003

    Cited by (1)

  • <no title>

    WONG K. L.

    Plasma Phys. Control. Fusion 41, R1, 1999

    Cited by (3)

  • <no title>

    WELLER A.

    Phys. Rev. Lett. 72, 1220, 1994

    Cited by (6)

  • <no title>

    WONG K. L.

    Phys. Rev. Lett. 66, 1874, 1991

    Cited by (8)

  • <no title>

    KRAMER G. J.

    Phys. Rev. Lett. 80, 2594, 1998

    Cited by (3)

  • <no title>

    FUKUYAMA A.

    6TH IAEA Technical Committee Meeting on Energetic Particles in Magnetic Confinement Systems, 12-14, October, 1999, Naka, 1999

    Cited by (1)

  • <no title>

    TAKECHI M.

    Fusion Energy 2002 (Proc. 19th Int. Conf. Lyon), 2002

    Cited by (1)

  • <no title>

    FUKUYAMA A.

    Fusion Energy 2002 (Proc. 19th Int. Conf. Lyon), 2002

    Cited by (1)

  • <no title>

    HEIDBRINK W. W.

    Plasma Phys. Control. Fusion 37, 937, 1995

    Cited by (4)

  • <no title>

    KUSAMA Y.

    Nucl. Fusion 39, 1837, 1999

    Cited by (4)

  • <no title>

    SHINOHARA K.

    Nucl. Fusion 42, 942, 2002

    Cited by (4)

  • <no title>

    KURIYAMA M.

    Proc. 17th IEEE/NPSS Symp. on Fusion Engineering, San Diego, CA, 1997, 1997

    Cited by (1)

  • <no title>

    SHINOHARA K.

    Nucl. Fusion 41, 603, 2001

    Cited by (3)

  • <no title>

    ISHIKAWA M.

    Rev. Sci. Instrum. 75, 3643, 2004

    Cited by (1)

  • <no title>

    ISHIKAWA M.

    Fusion Energy 2004 (Proc. 20th Int. Conf. Vilamoura), 2004

    Cited by (1)

  • <no title>

    TODO Y.

    Fusion Energy 2004 (Proc. 20th Int. Conf. Vilamoura), 2004

    Cited by (1)

  • <no title>

    Phys. Lett. E 238, 408, 1998

    Cited by (1)

  • <no title>

    SAIGUSA M.

    Nucl. Fusion 37, 1559, 1997

    Cited by (2)

  • <no title>

    TANI K.

    J. Phys. Soc. Jpn. 50, 1726, 1981

    Cited by (12)

  • <no title>

    FISCH N. J.

    Nucl. Fusion 34, 1541, 1994

    Cited by (1)

  • <no title>

    GATES D.

    Phys. Rev. Lett. 87, 205003, 2001

    Cited by (2)

  • Transition of Toroidal Alfven Eigenmode to Global Alfven Eigenmode in CHS Heliotron/Torsatron Plasmas Heated by Neutral Beam Injection

    TAKECHI Manabu , MATSUNAGA Go , TOI Kazuo , ISOBE Mitsutaka , MINAMI Takashi , TANAKA Kenji , NISHIMURA Shin , TAKAHASHI Chihiro , OKAMURA Shoichi , MATSUOKA Keisuke

    J. Plasma Fusion Res. 78(12), 1273-1274, 2002-12-25

    References (10) Cited by (1)

  • <no title>

    CHENG C. Z.

    Phys. Fluids B 3, 2463, 1991

    DOI  Cited by (2)

  • <no title>

    BERK H. L.

    Phys. Rev. Lett. 87, 185002, 2001

    Cited by (3)

  • <no title>

    NAZIKIAN R.

    Phys. Rev. Lett. 91, 125003, 2003

    Cited by (2)

  • Computer Simulation of Frequency Sweeping of Energetic Particle Mode in a JT-60U Experiment

    TODO Yasushi , SHINOHARA Kouji , TAKECHI Manabu , ISHIKAWA Masao

    Journal of Plasma and Fusion Research 79(11), 1107-1108, 2003-11-25

    J-STAGE  References (8) Cited by (2)

  • <no title>

    KUSAMA Y.

    Fusion Eng. Des. 34&35, 531, 1997

    Cited by (1)

  • <no title>

    ISHIKAWA M.

    Rev. Sci. Instrum. 73, 4237, 2002

    Cited by (2)

  • <no title>

    BERK H. L.

    Phys. Lett. A 234, 213, 1997

    Cited by (2)

  • <no title>

    FU G. Y.

    Phys. Plasmas 3, 4036, 1996

    DOI  Cited by (4)

  • <no title>

    GORELENKOV N. N.

    Phys. Plasmas 7, 2802, 1999

    DOI  Cited by (1)

Codes

  • NII Article ID (NAID)
    110006281952
  • NII NACSIS-CAT ID (NCID)
    AN10401672
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    09187928
  • NDL Article ID
    7434837
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z15-8
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE  NDL-Digital 
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