Recent progress of Alfvén eigenmode experiments using N-NB in JT-60U tokamak

K. Shinohara; M. Takechi; M. Ishikawa; Y. Kusama; A. Morioka; N. Oyama; K. Tobita; T. Ozeki; N. N. Gorelenkov; C. Z. Cheng; G. J. Kramer; R. Nazikian

doi:10.1088/0029-5515/42/8/302

Recent progress of Alfvén eigenmode experiments using N-NB in JT-60U tokamak

K. Shinohara, M. Takechi, M. Ishikawa, Y. Kusama, A. Morioka, N. Oyama, K. Tobita, T. Ozeki, N. N. Gorelenkov, C. Z. Cheng, G. J. Kramer, R. Nazikian

ENG - Quantum Science and Energy Engineering

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Abstract

Bursting modes in the frequency range of the toroidicity induced Alfvén eigenmode are observed in the plasma to which the negative-ion-based neutral beam (N-NB) is injected. A bursting mode changes its frequency by 10-20 kHz in 1-5 ms and is called fast frequency sweeping (fast FS) mode. Another bursting mode evolves explosively in ≤400 μs and is called an abrupt large-amplitude event. The dependence of their saturation level was compared with the experimentally observed growth rate and damping rate. The mode amplitude increases with the observed growth rate for fast FS modes. The modes with large amplitude and a large enhanced transport were observed when a large neutron emission rate was observed. The burst period increases as the drop ratio of the neutron emission increases.

Original language	English
Pages (from-to)	942-948
Number of pages	7
Journal	Nuclear Fusion
Volume	42
Issue number	8
DOIs	https://doi.org/10.1088/0029-5515/42/8/302
Publication status	Published - 2002 Aug

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title = "Recent progress of Alfv{\'e}n eigenmode experiments using N-NB in JT-60U tokamak",

abstract = "Bursting modes in the frequency range of the toroidicity induced Alfv{\'e}n eigenmode are observed in the plasma to which the negative-ion-based neutral beam (N-NB) is injected. A bursting mode changes its frequency by 10-20 kHz in 1-5 ms and is called fast frequency sweeping (fast FS) mode. Another bursting mode evolves explosively in ≤400 μs and is called an abrupt large-amplitude event. The dependence of their saturation level was compared with the experimentally observed growth rate and damping rate. The mode amplitude increases with the observed growth rate for fast FS modes. The modes with large amplitude and a large enhanced transport were observed when a large neutron emission rate was observed. The burst period increases as the drop ratio of the neutron emission increases.",

author = "K. Shinohara and M. Takechi and M. Ishikawa and Y. Kusama and A. Morioka and N. Oyama and K. Tobita and T. Ozeki and Gorelenkov, {N. N.} and Cheng, {C. Z.} and Kramer, {G. J.} and R. Nazikian",

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T1 - Recent progress of Alfvén eigenmode experiments using N-NB in JT-60U tokamak

AU - Shinohara, K.

AU - Takechi, M.

AU - Ishikawa, M.

AU - Kusama, Y.

AU - Morioka, A.

AU - Oyama, N.

AU - Tobita, K.

AU - Ozeki, T.

AU - Gorelenkov, N. N.

AU - Cheng, C. Z.

AU - Kramer, G. J.

AU - Nazikian, R.

PY - 2002/8

Y1 - 2002/8

N2 - Bursting modes in the frequency range of the toroidicity induced Alfvén eigenmode are observed in the plasma to which the negative-ion-based neutral beam (N-NB) is injected. A bursting mode changes its frequency by 10-20 kHz in 1-5 ms and is called fast frequency sweeping (fast FS) mode. Another bursting mode evolves explosively in ≤400 μs and is called an abrupt large-amplitude event. The dependence of their saturation level was compared with the experimentally observed growth rate and damping rate. The mode amplitude increases with the observed growth rate for fast FS modes. The modes with large amplitude and a large enhanced transport were observed when a large neutron emission rate was observed. The burst period increases as the drop ratio of the neutron emission increases.

AB - Bursting modes in the frequency range of the toroidicity induced Alfvén eigenmode are observed in the plasma to which the negative-ion-based neutral beam (N-NB) is injected. A bursting mode changes its frequency by 10-20 kHz in 1-5 ms and is called fast frequency sweeping (fast FS) mode. Another bursting mode evolves explosively in ≤400 μs and is called an abrupt large-amplitude event. The dependence of their saturation level was compared with the experimentally observed growth rate and damping rate. The mode amplitude increases with the observed growth rate for fast FS modes. The modes with large amplitude and a large enhanced transport were observed when a large neutron emission rate was observed. The burst period increases as the drop ratio of the neutron emission increases.

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SP - 942

EP - 948

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 8

ER -

Recent progress of Alfvén eigenmode experiments using N-NB in JT-60U tokamak

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