Observation of a beam-driven low-frequency mode in Heliotron J

L. G. Zang; S. Yamamoto; D. A. Spong; K. Nagasaki; S. Ohshima; S. Kobayashi; T. Minami; X. X. Lu; N. Nishino; S. Kado; P. Adulsiriswad; H. Okada; N. Kenmochi; S. Inagaki; J. X. Zhu; G. M. Weir; T. Mizuuchi; S. Konoshima; A. Ishizawa; D. L. Yu; Z. B. Shi; Yi Liu; L. W. Yan; J. Q. Li; Q. W. Yang; M. Xu; X. R. Duan; Yong Liu

doi:10.1088/1741-4326/ab0197

Observation of a beam-driven low-frequency mode in Heliotron J

L. G. Zang, S. Yamamoto, D. A. Spong, K. Nagasaki, S. Ohshima, S. Kobayashi, T. Minami, X. X. Lu, N. Nishino, S. Kado, P. Adulsiriswad, H. Okada, N. Kenmochi, S. Inagaki, J. X. Zhu, G. M. Weir, T. Mizuuchi, S. Konoshima, A. Ishizawa, D. L. YuZ. B. Shi, Yi Liu, L. W. Yan, J. Q. Li, Q. W. Yang, M. Xu, X. R. Duan, Yong Liu

Plasma Theory and Modeling

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

A low-frequency electromagnetic mode (LF-mode) has been observed in a stellarator/heliotron device, Heliotron J. The LF-mode is observed only in neutral beam heated plasmas with a co-current, which increases the rotational transform. The observed LF-mode peaks at rho = 0.86-0.91, where rho = r/a is the normalized minor radius. The LF-mode propagates in the ion diamagnetic drift direction, and the poloidal mode number is m ∼ 6-8, determined with a combination of Mirnov coil arrays and 2D fast camera measurement. A high m number induces significant Doppler shift from the background ion flow. The frequency is corrected with both E × B rotation and the ion diamagnetic flow. The corrected frequency is almost consistent with the beta-induced Alfvén eigenmode gap evaluated with the STELLGAP code, although very close to the accumulation point. The mode could also be a global Alfvén eigenmode.

Original language	English
Article number	056001
Journal	Nuclear Fusion
Volume	59
Issue number	5
DOIs	https://doi.org/10.1088/1741-4326/ab0197
State	Published - Mar 14 2019

Keywords

BAE
GAE
Heliotron J
STELLGAP
gas puff imaging
stellarator/heliotron

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1088/1741-4326/ab0197

Cite this

Zang, L. G., Yamamoto, S., Spong, D. A., Nagasaki, K., Ohshima, S., Kobayashi, S., Minami, T., Lu, X. X., Nishino, N., Kado, S., Adulsiriswad, P., Okada, H., Kenmochi, N., Inagaki, S., Zhu, J. X., Weir, G. M., Mizuuchi, T., Konoshima, S., Ishizawa, A., ... Liu, Y. (2019). Observation of a beam-driven low-frequency mode in Heliotron J. Nuclear Fusion, 59(5), Article 056001. https://doi.org/10.1088/1741-4326/ab0197

@article{33a5ae58cdad4eff91279e74c417619e,

title = "Observation of a beam-driven low-frequency mode in Heliotron J",

abstract = "A low-frequency electromagnetic mode (LF-mode) has been observed in a stellarator/heliotron device, Heliotron J. The LF-mode is observed only in neutral beam heated plasmas with a co-current, which increases the rotational transform. The observed LF-mode peaks at rho = 0.86-0.91, where rho = r/a is the normalized minor radius. The LF-mode propagates in the ion diamagnetic drift direction, and the poloidal mode number is m ∼ 6-8, determined with a combination of Mirnov coil arrays and 2D fast camera measurement. A high m number induces significant Doppler shift from the background ion flow. The frequency is corrected with both E × B rotation and the ion diamagnetic flow. The corrected frequency is almost consistent with the beta-induced Alfv{\'e}n eigenmode gap evaluated with the STELLGAP code, although very close to the accumulation point. The mode could also be a global Alfv{\'e}n eigenmode.",

keywords = "BAE, GAE, Heliotron J, STELLGAP, gas puff imaging, stellarator/heliotron",

author = "Zang, {L. G.} and S. Yamamoto and Spong, {D. A.} and K. Nagasaki and S. Ohshima and S. Kobayashi and T. Minami and Lu, {X. X.} and N. Nishino and S. Kado and P. Adulsiriswad and H. Okada and N. Kenmochi and S. Inagaki and Zhu, {J. X.} and Weir, {G. M.} and T. Mizuuchi and S. Konoshima and A. Ishizawa and Yu, {D. L.} and Shi, {Z. B.} and Yi Liu and Yan, {L. W.} and Li, {J. Q.} and Yang, {Q. W.} and M. Xu and Duan, {X. R.} and Yong Liu",

note = "Publisher Copyright: {\textcopyright} 2019 IAEA, Vienna.",

year = "2019",

month = mar,

day = "14",

doi = "10.1088/1741-4326/ab0197",

language = "English",

volume = "59",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "5",

}

Zang, LG, Yamamoto, S, Spong, DA, Nagasaki, K, Ohshima, S, Kobayashi, S, Minami, T, Lu, XX, Nishino, N, Kado, S, Adulsiriswad, P, Okada, H, Kenmochi, N, Inagaki, S, Zhu, JX, Weir, GM, Mizuuchi, T, Konoshima, S, Ishizawa, A, Yu, DL, Shi, ZB, Liu, Y, Yan, LW, Li, JQ, Yang, QW, Xu, M, Duan, XR & Liu, Y 2019, 'Observation of a beam-driven low-frequency mode in Heliotron J', Nuclear Fusion, vol. 59, no. 5, 056001. https://doi.org/10.1088/1741-4326/ab0197

TY - JOUR

T1 - Observation of a beam-driven low-frequency mode in Heliotron J

AU - Zang, L. G.

AU - Yamamoto, S.

AU - Spong, D. A.

AU - Nagasaki, K.

AU - Ohshima, S.

AU - Kobayashi, S.

AU - Minami, T.

AU - Lu, X. X.

AU - Nishino, N.

AU - Kado, S.

AU - Adulsiriswad, P.

AU - Okada, H.

AU - Kenmochi, N.

AU - Inagaki, S.

AU - Zhu, J. X.

AU - Weir, G. M.

AU - Mizuuchi, T.

AU - Konoshima, S.

AU - Ishizawa, A.

AU - Yu, D. L.

AU - Shi, Z. B.

AU - Liu, Yi

AU - Yan, L. W.

AU - Li, J. Q.

AU - Yang, Q. W.

AU - Xu, M.

AU - Duan, X. R.

AU - Liu, Yong

PY - 2019/3/14

Y1 - 2019/3/14

N2 - A low-frequency electromagnetic mode (LF-mode) has been observed in a stellarator/heliotron device, Heliotron J. The LF-mode is observed only in neutral beam heated plasmas with a co-current, which increases the rotational transform. The observed LF-mode peaks at rho = 0.86-0.91, where rho = r/a is the normalized minor radius. The LF-mode propagates in the ion diamagnetic drift direction, and the poloidal mode number is m ∼ 6-8, determined with a combination of Mirnov coil arrays and 2D fast camera measurement. A high m number induces significant Doppler shift from the background ion flow. The frequency is corrected with both E × B rotation and the ion diamagnetic flow. The corrected frequency is almost consistent with the beta-induced Alfvén eigenmode gap evaluated with the STELLGAP code, although very close to the accumulation point. The mode could also be a global Alfvén eigenmode.

AB - A low-frequency electromagnetic mode (LF-mode) has been observed in a stellarator/heliotron device, Heliotron J. The LF-mode is observed only in neutral beam heated plasmas with a co-current, which increases the rotational transform. The observed LF-mode peaks at rho = 0.86-0.91, where rho = r/a is the normalized minor radius. The LF-mode propagates in the ion diamagnetic drift direction, and the poloidal mode number is m ∼ 6-8, determined with a combination of Mirnov coil arrays and 2D fast camera measurement. A high m number induces significant Doppler shift from the background ion flow. The frequency is corrected with both E × B rotation and the ion diamagnetic flow. The corrected frequency is almost consistent with the beta-induced Alfvén eigenmode gap evaluated with the STELLGAP code, although very close to the accumulation point. The mode could also be a global Alfvén eigenmode.

KW - BAE

KW - GAE

KW - Heliotron J

KW - STELLGAP

KW - gas puff imaging

KW - stellarator/heliotron

UR - http://www.scopus.com/inward/record.url?scp=85066110699&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/ab0197

DO - 10.1088/1741-4326/ab0197

M3 - Article

AN - SCOPUS:85066110699

SN - 0029-5515

VL - 59

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 5

M1 - 056001

ER -

Observation of a beam-driven low-frequency mode in Heliotron J

Abstract

Keywords

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this