Improved confinement mode induced by the MARFE on the HT-7 superconducting tokamak

X. Gao; Y. P. Zhao; J. R. Luo; Y. X. Jie; X. Z. Gong; B. N. Wan; J. G. Li; F. X. Yin; G. L. Kuang; X. D. Zhang; S. Y. Zhang; N. Qiu; X. N. Liu; J. Y. Zhao; Y. Yang; Y. Bao; B. L. Lin; Z. W. Wu; Y. D. Li; Y. H. Xu; K. Yang; G. X. Wang; W. W. Ye; L. Chen; Y. J. Shi; M. Song; X. M. Zhang; P. J. Qin; X. M. Gu; N. Z. Cui; H. Y. Fan; S. X. Liu; Y. F. Chen; L. Q. Hu; J. S. Hu; C. Y. Xia; H. L. Ruan; X. D. Tong; J. S. Mao; J. K. Xie; Y. X. Wan

doi:10.1088/0741-3335/41/11/302

Improved confinement mode induced by the MARFE on the HT-7 superconducting tokamak

X. Gao
, Y. P. Zhao
, J. R. Luo
, Y. X. Jie
, X. Z. Gong
, B. N. Wan
, J. G. Li
, F. X. Yin
, G. L. Kuang
, X. D. Zhang
, S. Y. Zhang
, N. Qiu
, X. N. Liu
, J. Y. Zhao
, Y. Yang
, Y. Bao
, B. L. Lin
, Z. W. Wu
, Y. D. Li
, Y. H. Xu

K. Yang, G. X. Wang, W. W. Ye, L. Chen, Y. J. Shi, M. Song, X. M. Zhang, P. J. Qin, X. M. Gu, N. Z. Cui, H. Y. Fan, S. X. Liu, Y. F. Chen, L. Q. Hu, J. S. Hu, C. Y. Xia, H. L. Ruan, X. D. Tong, J. S. Mao, J. K. Xie, Y. X. Wan

School of Electrical Engineering

CAS - Institute of Plasma Physics

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

14 Scopus citations

Abstract

In the HT-7 superconducting tokamak, the onset of a multifaceted asymmetric radiation from the edge (MARFE) usually occurs in the early ohmic discharges of each experimental campaign before wall conditioning. The occurrence and location of a MARFE is identified by different diagnostic systems. An improved confinement mode plasma which was induced by the MARFE is observed, and the global particle confinement time increases 1.9 times. The relaxation time between the MARFE event trigger and the L-H transition is about 1.4 ms, the following L-H transition time is 1.9 ms, and the improved confinement mode phase is maintained for about 40 ms. The MARFE cools the plasma edge, and the electron density profile is observed to become more narrow and peaked. The occurrence of a MARFE is strongly correlated with Z_eff but not with the density, and it always occurs at Z_eff = 3-8 ohmic discharges. In the case of a good wall condition (Z_eff = 1-2), the onset of MARFEs has not been observed before reaching the Greenwald density limit.

Original language	English
Pages (from-to)	1349-1355
Number of pages	7
Journal	Plasma Physics and Controlled Fusion
Volume	41
Issue number	11
DOIs	https://doi.org/10.1088/0741-3335/41/11/302
State	Published - Nov 1999

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Gao, X., Zhao, Y. P., Luo, J. R., Jie, Y. X., Gong, X. Z., Wan, B. N., Li, J. G., Yin, F. X., Kuang, G. L., Zhang, X. D., Zhang, S. Y., Qiu, N., Liu, X. N., Zhao, J. Y., Yang, Y., Bao, Y., Lin, B. L., Wu, Z. W., Li, Y. D., ... Wan, Y. X. (1999). Improved confinement mode induced by the MARFE on the HT-7 superconducting tokamak. Plasma Physics and Controlled Fusion, 41(11), 1349-1355. https://doi.org/10.1088/0741-3335/41/11/302

@article{f837cd01afb847d49e6dd2ef64ea47c4,

title = "Improved confinement mode induced by the MARFE on the HT-7 superconducting tokamak",

abstract = "In the HT-7 superconducting tokamak, the onset of a multifaceted asymmetric radiation from the edge (MARFE) usually occurs in the early ohmic discharges of each experimental campaign before wall conditioning. The occurrence and location of a MARFE is identified by different diagnostic systems. An improved confinement mode plasma which was induced by the MARFE is observed, and the global particle confinement time increases 1.9 times. The relaxation time between the MARFE event trigger and the L-H transition is about 1.4 ms, the following L-H transition time is 1.9 ms, and the improved confinement mode phase is maintained for about 40 ms. The MARFE cools the plasma edge, and the electron density profile is observed to become more narrow and peaked. The occurrence of a MARFE is strongly correlated with Zeff but not with the density, and it always occurs at Zeff = 3-8 ohmic discharges. In the case of a good wall condition (Zeff = 1-2), the onset of MARFEs has not been observed before reaching the Greenwald density limit.",

author = "X. Gao and Zhao, \{Y. P.\} and Luo, \{J. R.\} and Jie, \{Y. X.\} and Gong, \{X. Z.\} and Wan, \{B. N.\} and Li, \{J. G.\} and Yin, \{F. X.\} and Kuang, \{G. L.\} and Zhang, \{X. D.\} and Zhang, \{S. Y.\} and N. Qiu and Liu, \{X. N.\} and Zhao, \{J. Y.\} and Y. Yang and Y. Bao and Lin, \{B. L.\} and Wu, \{Z. W.\} and Li, \{Y. D.\} and Xu, \{Y. H.\} and K. Yang and Wang, \{G. X.\} and Ye, \{W. W.\} and L. Chen and Shi, \{Y. J.\} and M. Song and Zhang, \{X. M.\} and Qin, \{P. J.\} and Gu, \{X. M.\} and Cui, \{N. Z.\} and Fan, \{H. Y.\} and Liu, \{S. X.\} and Chen, \{Y. F.\} and Hu, \{L. Q.\} and Hu, \{J. S.\} and Xia, \{C. Y.\} and Ruan, \{H. L.\} and Tong, \{X. D.\} and Mao, \{J. S.\} and Xie, \{J. K.\} and Wan, \{Y. X.\}",

year = "1999",

month = nov,

doi = "10.1088/0741-3335/41/11/302",

language = "英语",

volume = "41",

pages = "1349--1355",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing Ltd.",

number = "11",

}

Gao, X, Zhao, YP, Luo, JR, Jie, YX, Gong, XZ, Wan, BN, Li, JG, Yin, FX, Kuang, GL, Zhang, XD, Zhang, SY, Qiu, N, Liu, XN, Zhao, JY, Yang, Y, Bao, Y, Lin, BL, Wu, ZW, Li, YD, Xu, YH, Yang, K, Wang, GX, Ye, WW, Chen, L, Shi, YJ, Song, M, Zhang, XM, Qin, PJ, Gu, XM, Cui, NZ, Fan, HY, Liu, SX, Chen, YF, Hu, LQ, Hu, JS, Xia, CY, Ruan, HL, Tong, XD, Mao, JS, Xie, JK & Wan, YX 1999, 'Improved confinement mode induced by the MARFE on the HT-7 superconducting tokamak', Plasma Physics and Controlled Fusion, vol. 41, no. 11, pp. 1349-1355. https://doi.org/10.1088/0741-3335/41/11/302

TY - JOUR

T1 - Improved confinement mode induced by the MARFE on the HT-7 superconducting tokamak

AU - Gao, X.

AU - Zhao, Y. P.

AU - Luo, J. R.

AU - Jie, Y. X.

AU - Gong, X. Z.

AU - Wan, B. N.

AU - Li, J. G.

AU - Yin, F. X.

AU - Kuang, G. L.

AU - Zhang, X. D.

AU - Zhang, S. Y.

AU - Qiu, N.

AU - Liu, X. N.

AU - Zhao, J. Y.

AU - Yang, Y.

AU - Bao, Y.

AU - Lin, B. L.

AU - Wu, Z. W.

AU - Li, Y. D.

AU - Xu, Y. H.

AU - Yang, K.

AU - Wang, G. X.

AU - Ye, W. W.

AU - Chen, L.

AU - Shi, Y. J.

AU - Song, M.

AU - Zhang, X. M.

AU - Qin, P. J.

AU - Gu, X. M.

AU - Cui, N. Z.

AU - Fan, H. Y.

AU - Liu, S. X.

AU - Chen, Y. F.

AU - Hu, L. Q.

AU - Hu, J. S.

AU - Xia, C. Y.

AU - Ruan, H. L.

AU - Tong, X. D.

AU - Mao, J. S.

AU - Xie, J. K.

AU - Wan, Y. X.

PY - 1999/11

Y1 - 1999/11

N2 - In the HT-7 superconducting tokamak, the onset of a multifaceted asymmetric radiation from the edge (MARFE) usually occurs in the early ohmic discharges of each experimental campaign before wall conditioning. The occurrence and location of a MARFE is identified by different diagnostic systems. An improved confinement mode plasma which was induced by the MARFE is observed, and the global particle confinement time increases 1.9 times. The relaxation time between the MARFE event trigger and the L-H transition is about 1.4 ms, the following L-H transition time is 1.9 ms, and the improved confinement mode phase is maintained for about 40 ms. The MARFE cools the plasma edge, and the electron density profile is observed to become more narrow and peaked. The occurrence of a MARFE is strongly correlated with Zeff but not with the density, and it always occurs at Zeff = 3-8 ohmic discharges. In the case of a good wall condition (Zeff = 1-2), the onset of MARFEs has not been observed before reaching the Greenwald density limit.

AB - In the HT-7 superconducting tokamak, the onset of a multifaceted asymmetric radiation from the edge (MARFE) usually occurs in the early ohmic discharges of each experimental campaign before wall conditioning. The occurrence and location of a MARFE is identified by different diagnostic systems. An improved confinement mode plasma which was induced by the MARFE is observed, and the global particle confinement time increases 1.9 times. The relaxation time between the MARFE event trigger and the L-H transition is about 1.4 ms, the following L-H transition time is 1.9 ms, and the improved confinement mode phase is maintained for about 40 ms. The MARFE cools the plasma edge, and the electron density profile is observed to become more narrow and peaked. The occurrence of a MARFE is strongly correlated with Zeff but not with the density, and it always occurs at Zeff = 3-8 ohmic discharges. In the case of a good wall condition (Zeff = 1-2), the onset of MARFEs has not been observed before reaching the Greenwald density limit.

UR - https://www.scopus.com/pages/publications/0033276766

U2 - 10.1088/0741-3335/41/11/302

DO - 10.1088/0741-3335/41/11/302

M3 - 文章

AN - SCOPUS:0033276766

SN - 0741-3335

VL - 41

SP - 1349

EP - 1355

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 11

ER -

Improved confinement mode induced by the MARFE on the HT-7 superconducting tokamak

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