Observation of confinement degradation of energetic ions due to Alfvén eigenmodes in JT-60U weak shear plasmas

M. Ishikawa; M. Takechi; K. Shinohara; Y. Kusama; G. Matsunaga; V. A. Krasilnikov; Yu Kashuck; M. Isobe; T. Nishitani; A. Morioka; M. Sasao; Chio-Zong Cheng; N. N. Gorelenkov; G. J. Kramer; R. Nazikian

doi:10.1088/0029-5515/46/10/S05

Observation of confinement degradation of energetic ions due to Alfvén eigenmodes in JT-60U weak shear plasmas

M. Ishikawa
, M. Takechi
, K. Shinohara
, Y. Kusama
, G. Matsunaga
, V. A. Krasilnikov
, Yu Kashuck
, M. Isobe
, T. Nishitani
, A. Morioka
, M. Sasao
, Chio-Zong Cheng
, N. N. Gorelenkov
, G. J. Kramer
, R. Nazikian

太空與電漿科學研究所

研究成果: Article › 同行評審

18 引文斯高帕斯（Scopus）

摘要

Confinement degradation of energetic ions due to Alfvén eigenmodes (AEs) has been investigated with negative ion based neutral beam injection at ∼370 keV into JT-60U weak shear plasmas. AEs with a rapid frequency sweeping and then saturation as the minimum value of the safety factor decreases have been observed. This frequency behaviour can be explained by the reversed-shear induced AE (RSAE) and the transition from RSAEs to the toroidicity-induced AEs (TAEs). The associated change in the charge exchange neutral particle flux suggests energetic ion transport due to these AEs. The total neutron emission reduction rate in the presence of these AEs is evaluated by calculation using the orbit following Monte-Carlo code taking into account the change in bulk plasmas. The evaluation indicates confinement of energetic ions is degraded due to these AEs. In particular, it is found that the confinement degradation of energetic ions is maximum during the transition from RSAEs to TAEs and the maximum reduction rate (ΔSn/Sn)_MAX is estimated to be ∼45%.

原文	English
文章編號	S05
期刊	Nuclear Fusion
卷	46
發行號	10
DOIs	https://doi.org/10.1088/0029-5515/46/10/S05
出版狀態	Published - 2006 10月 1

All Science Journal Classification (ASJC) codes

核能與高能物理
凝聚態物理學

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10.1088/0029-5515/46/10/S05

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Ishikawa, M., Takechi, M., Shinohara, K., Kusama, Y., Matsunaga, G., Krasilnikov, V. A., Kashuck, Y., Isobe, M., Nishitani, T., Morioka, A., Sasao, M., Cheng, C.-Z., Gorelenkov, N. N., Kramer, G. J., & Nazikian, R. (2006). Observation of confinement degradation of energetic ions due to Alfvén eigenmodes in JT-60U weak shear plasmas. Nuclear Fusion, 46(10), 文章 S05. https://doi.org/10.1088/0029-5515/46/10/S05

@article{de7c430ea5b04b659981323325ac5b25,

title = "Observation of confinement degradation of energetic ions due to Alfv{\'e}n eigenmodes in JT-60U weak shear plasmas",

abstract = "Confinement degradation of energetic ions due to Alfv{\'e}n eigenmodes (AEs) has been investigated with negative ion based neutral beam injection at ∼370 keV into JT-60U weak shear plasmas. AEs with a rapid frequency sweeping and then saturation as the minimum value of the safety factor decreases have been observed. This frequency behaviour can be explained by the reversed-shear induced AE (RSAE) and the transition from RSAEs to the toroidicity-induced AEs (TAEs). The associated change in the charge exchange neutral particle flux suggests energetic ion transport due to these AEs. The total neutron emission reduction rate in the presence of these AEs is evaluated by calculation using the orbit following Monte-Carlo code taking into account the change in bulk plasmas. The evaluation indicates confinement of energetic ions is degraded due to these AEs. In particular, it is found that the confinement degradation of energetic ions is maximum during the transition from RSAEs to TAEs and the maximum reduction rate (ΔSn/Sn)MAX is estimated to be ∼45\%.",

author = "M. Ishikawa and M. Takechi and K. Shinohara and Y. Kusama and G. Matsunaga and Krasilnikov, \{V. A.\} and Yu Kashuck and M. Isobe and T. Nishitani and A. Morioka and M. Sasao and Chio-Zong Cheng and Gorelenkov, \{N. N.\} and Kramer, \{G. J.\} and R. Nazikian",

year = "2006",

month = oct,

day = "1",

doi = "10.1088/0029-5515/46/10/S05",

language = "English",

volume = "46",

journal = "Nuclear Fusion",

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Ishikawa, M, Takechi, M, Shinohara, K, Kusama, Y, Matsunaga, G, Krasilnikov, VA, Kashuck, Y, Isobe, M, Nishitani, T, Morioka, A, Sasao, M, Cheng, C-Z, Gorelenkov, NN, Kramer, GJ & Nazikian, R 2006, 'Observation of confinement degradation of energetic ions due to Alfvén eigenmodes in JT-60U weak shear plasmas', Nuclear Fusion, 卷 46, 編號 10, S05. https://doi.org/10.1088/0029-5515/46/10/S05

TY - JOUR

T1 - Observation of confinement degradation of energetic ions due to Alfvén eigenmodes in JT-60U weak shear plasmas

AU - Ishikawa, M.

AU - Takechi, M.

AU - Shinohara, K.

AU - Kusama, Y.

AU - Matsunaga, G.

AU - Krasilnikov, V. A.

AU - Kashuck, Yu

AU - Isobe, M.

AU - Nishitani, T.

AU - Morioka, A.

AU - Sasao, M.

AU - Cheng, Chio-Zong

AU - Gorelenkov, N. N.

AU - Kramer, G. J.

AU - Nazikian, R.

PY - 2006/10/1

Y1 - 2006/10/1

N2 - Confinement degradation of energetic ions due to Alfvén eigenmodes (AEs) has been investigated with negative ion based neutral beam injection at ∼370 keV into JT-60U weak shear plasmas. AEs with a rapid frequency sweeping and then saturation as the minimum value of the safety factor decreases have been observed. This frequency behaviour can be explained by the reversed-shear induced AE (RSAE) and the transition from RSAEs to the toroidicity-induced AEs (TAEs). The associated change in the charge exchange neutral particle flux suggests energetic ion transport due to these AEs. The total neutron emission reduction rate in the presence of these AEs is evaluated by calculation using the orbit following Monte-Carlo code taking into account the change in bulk plasmas. The evaluation indicates confinement of energetic ions is degraded due to these AEs. In particular, it is found that the confinement degradation of energetic ions is maximum during the transition from RSAEs to TAEs and the maximum reduction rate (ΔSn/Sn)MAX is estimated to be ∼45%.

AB - Confinement degradation of energetic ions due to Alfvén eigenmodes (AEs) has been investigated with negative ion based neutral beam injection at ∼370 keV into JT-60U weak shear plasmas. AEs with a rapid frequency sweeping and then saturation as the minimum value of the safety factor decreases have been observed. This frequency behaviour can be explained by the reversed-shear induced AE (RSAE) and the transition from RSAEs to the toroidicity-induced AEs (TAEs). The associated change in the charge exchange neutral particle flux suggests energetic ion transport due to these AEs. The total neutron emission reduction rate in the presence of these AEs is evaluated by calculation using the orbit following Monte-Carlo code taking into account the change in bulk plasmas. The evaluation indicates confinement of energetic ions is degraded due to these AEs. In particular, it is found that the confinement degradation of energetic ions is maximum during the transition from RSAEs to TAEs and the maximum reduction rate (ΔSn/Sn)MAX is estimated to be ∼45%.

UR - https://www.scopus.com/pages/publications/33749041465

UR - https://www.scopus.com/pages/publications/33749041465#tab=citedBy

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M3 - Article

AN - SCOPUS:33749041465

SN - 0029-5515

VL - 46

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 10

M1 - S05

ER -

Observation of confinement degradation of energetic ions due to Alfvén eigenmodes in JT-60U weak shear plasmas

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