Experimental study of quasi-coherent mode using EAST tangential CO                         2                          laser collective scattering diagnostic in far-forward mode

P. J. Sun; Y. D. Li; Y. Ren; X. D. Zhang; G. J. Wu; Y. M. Wang; T. H. Shi; B. Lyu; Y. M. Duan; J. Z. Zhang; F. D. Wang; H. Q. Liu; S. T. Mao; L. Q. Xu; Q. Li; P. Li; J. Bi; L. Q. Hu; J. G. Li

doi:10.1063/1.5049209

Experimental study of quasi-coherent mode using EAST tangential CO ₂ laser collective scattering diagnostic in far-forward mode

P. J. Sun
, Y. D. Li
, Y. Ren
, X. D. Zhang
, G. J. Wu
, Y. M. Wang
, T. H. Shi
, B. Lyu
, Y. M. Duan
, J. Z. Zhang
, F. D. Wang
, H. Q. Liu
, S. T. Mao
, L. Q. Xu
, Q. Li
, P. Li
, J. Bi
, L. Q. Hu
, J. G. Li

PPPL NSTX

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

21 Scopus citations

Abstract

A quasi-coherent mode (QCM) was measured by the tangential CO ₂ laser collective scattering diagnostic at high plasma electron density during both enhanced D _α /small edge-localized mode (ELM) and ELM-free H mode phases in Experimental Advanced Superconducting Tokamak (EAST). Experimental results from only local oscillator CO ₂ laser scattering prove that the QCM is measured by the scattering diagnostic in the far-forward mode. The driven QCM density fluctuation ( k ⊥ < 3 cm ⁻¹ ) and magnetic fluctuation suggest that the QCM is an electromagnetic mode. The typical frequency of the QCM is f ≈ 26.5 kHz. A combination analysis of scattering signals and Mirnov signals suggests that the QCM has toroidal mode number n ≈ 17 and rotates along with the electron diamagnetic drift velocity direction in the lab frame. The analysis of Mirnov and reflectometer signals supports that the QCM locates in the edge pedestal region. The QCM power has been found to be related to both the D _α signal and the pedestal density gradient. A comparison of the EAST QCM and C-Mod quasi-coherent mode has been given in detail.

Original language	English (US)
Article number	012304
Journal	Physics of Plasmas
Volume	26
Issue number	1
DOIs	https://doi.org/10.1063/1.5049209
State	Published - Jan 1 2019

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.5049209

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Sun, P. J., Li, Y. D., Ren, Y., Zhang, X. D., Wu, G. J., Wang, Y. M., Shi, T. H., Lyu, B., Duan, Y. M., Zhang, J. Z., Wang, F. D., Liu, H. Q., Mao, S. T., Xu, L. Q., Li, Q., Li, P., Bi, J., Hu, L. Q., & Li, J. G. (2019). Experimental study of quasi-coherent mode using EAST tangential CO ₂ laser collective scattering diagnostic in far-forward mode Physics of Plasmas, 26(1), Article 012304. https://doi.org/10.1063/1.5049209

@article{696c3da3573347068989154ff621a97d,

title = " Experimental study of quasi-coherent mode using EAST tangential CO 2 laser collective scattering diagnostic in far-forward mode ",

abstract = " A quasi-coherent mode (QCM) was measured by the tangential CO 2 laser collective scattering diagnostic at high plasma electron density during both enhanced D α /small edge-localized mode (ELM) and ELM-free H mode phases in Experimental Advanced Superconducting Tokamak (EAST). Experimental results from only local oscillator CO 2 laser scattering prove that the QCM is measured by the scattering diagnostic in the far-forward mode. The driven QCM density fluctuation ( k ⊥ < 3 cm −1 ) and magnetic fluctuation suggest that the QCM is an electromagnetic mode. The typical frequency of the QCM is f ≈ 26.5 kHz. A combination analysis of scattering signals and Mirnov signals suggests that the QCM has toroidal mode number n ≈ 17 and rotates along with the electron diamagnetic drift velocity direction in the lab frame. The analysis of Mirnov and reflectometer signals supports that the QCM locates in the edge pedestal region. The QCM power has been found to be related to both the D α signal and the pedestal density gradient. A comparison of the EAST QCM and C-Mod quasi-coherent mode has been given in detail.",

author = "Sun, \{P. J.\} and Li, \{Y. D.\} and Y. Ren and Zhang, \{X. D.\} and Wu, \{G. J.\} and Wang, \{Y. M.\} and Shi, \{T. H.\} and B. Lyu and Duan, \{Y. M.\} and Zhang, \{J. Z.\} and Wang, \{F. D.\} and Liu, \{H. Q.\} and Mao, \{S. T.\} and Xu, \{L. Q.\} and Q. Li and P. Li and J. Bi and Hu, \{L. Q.\} and Li, \{J. G.\}",

note = "Publisher Copyright: {\textcopyright} 2019 Author(s).",

year = "2019",

month = jan,

day = "1",

doi = "10.1063/1.5049209",

language = "English (US)",

volume = "26",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "1",

}

Sun, PJ, Li, YD, Ren, Y, Zhang, XD, Wu, GJ, Wang, YM, Shi, TH, Lyu, B, Duan, YM, Zhang, JZ, Wang, FD, Liu, HQ, Mao, ST, Xu, LQ, Li, Q, Li, P, Bi, J, Hu, LQ & Li, JG 2019, ' Experimental study of quasi-coherent mode using EAST tangential CO ₂ laser collective scattering diagnostic in far-forward mode ', Physics of Plasmas, vol. 26, no. 1, 012304. https://doi.org/10.1063/1.5049209

Experimental study of quasi-coherent mode using EAST tangential CO ₂ laser collective scattering diagnostic in far-forward mode . / Sun, P. J.; Li, Y. D.; Ren, Y. et al.
In: Physics of Plasmas, Vol. 26, No. 1, 012304, 01.01.2019.

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

TY - JOUR

T1 - Experimental study of quasi-coherent mode using EAST tangential CO 2 laser collective scattering diagnostic in far-forward mode

AU - Sun, P. J.

AU - Li, Y. D.

AU - Ren, Y.

AU - Zhang, X. D.

AU - Wu, G. J.

AU - Wang, Y. M.

AU - Shi, T. H.

AU - Lyu, B.

AU - Duan, Y. M.

AU - Zhang, J. Z.

AU - Wang, F. D.

AU - Liu, H. Q.

AU - Mao, S. T.

AU - Xu, L. Q.

AU - Li, Q.

AU - Li, P.

AU - Bi, J.

AU - Hu, L. Q.

AU - Li, J. G.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - A quasi-coherent mode (QCM) was measured by the tangential CO 2 laser collective scattering diagnostic at high plasma electron density during both enhanced D α /small edge-localized mode (ELM) and ELM-free H mode phases in Experimental Advanced Superconducting Tokamak (EAST). Experimental results from only local oscillator CO 2 laser scattering prove that the QCM is measured by the scattering diagnostic in the far-forward mode. The driven QCM density fluctuation ( k ⊥ < 3 cm −1 ) and magnetic fluctuation suggest that the QCM is an electromagnetic mode. The typical frequency of the QCM is f ≈ 26.5 kHz. A combination analysis of scattering signals and Mirnov signals suggests that the QCM has toroidal mode number n ≈ 17 and rotates along with the electron diamagnetic drift velocity direction in the lab frame. The analysis of Mirnov and reflectometer signals supports that the QCM locates in the edge pedestal region. The QCM power has been found to be related to both the D α signal and the pedestal density gradient. A comparison of the EAST QCM and C-Mod quasi-coherent mode has been given in detail.

AB - A quasi-coherent mode (QCM) was measured by the tangential CO 2 laser collective scattering diagnostic at high plasma electron density during both enhanced D α /small edge-localized mode (ELM) and ELM-free H mode phases in Experimental Advanced Superconducting Tokamak (EAST). Experimental results from only local oscillator CO 2 laser scattering prove that the QCM is measured by the scattering diagnostic in the far-forward mode. The driven QCM density fluctuation ( k ⊥ < 3 cm −1 ) and magnetic fluctuation suggest that the QCM is an electromagnetic mode. The typical frequency of the QCM is f ≈ 26.5 kHz. A combination analysis of scattering signals and Mirnov signals suggests that the QCM has toroidal mode number n ≈ 17 and rotates along with the electron diamagnetic drift velocity direction in the lab frame. The analysis of Mirnov and reflectometer signals supports that the QCM locates in the edge pedestal region. The QCM power has been found to be related to both the D α signal and the pedestal density gradient. A comparison of the EAST QCM and C-Mod quasi-coherent mode has been given in detail.

UR - https://www.scopus.com/pages/publications/85059812829

UR - https://www.scopus.com/pages/publications/85059812829#tab=citedBy

U2 - 10.1063/1.5049209

DO - 10.1063/1.5049209

M3 - Article

AN - SCOPUS:85059812829

SN - 1070-664X

VL - 26

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 1

M1 - 012304

ER -

Experimental study of quasi-coherent mode using EAST tangential CO ₂ laser collective scattering diagnostic in far-forward mode

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