Sawtooth stabilization by localized electron cyclotron heating in a tokamak plasma

K. Hanada; H. Tanaka; M. Iida; S. Ide; T. Minami; M. Nakamura; T. Maekawa; Y. Terumichi; S. Tanaka; M. Yamada; J. Manickam; R. B. White

doi:10.1103/PhysRevLett.66.1974

Sawtooth stabilization by localized electron cyclotron heating in a tokamak plasma

K. Hanada, H. Tanaka, M. Iida, S. Ide, T. Minami, M. Nakamura, T. Maekawa, Y. Terumichi, S. Tanaka, M. Yamada, J. Manickam, R. B. White

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

23 Citations (Scopus)

Abstract

Sawtooth oscillations (STO) in the Ohmically heated WT-3 tokamak are strongly modified or suppressed by localized-electron cyclotron resonance heating (ECH) near the q=1 surface, where q refers to the safety factor. The efect of ECH is much stronger when it is applied on the high-field side as compared to the low-field side. Complete suppression of the STO is achieved for the duration of the ECH, in most cases, when it is applied on the high-field side of a low-density plasma, provided the ECH power exceeds a threshold value. The STO stabilization is attributed to a modification of the current-density profile by hot electrons generated by ECH, which reduces the shear in the q=1 region.

Original language	English
Pages (from-to)	1974-1977
Number of pages	4
Journal	Physical review letters
Volume	66
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.66.1974
Publication status	Published - 1991
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.66.1974

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abstract = "Sawtooth oscillations (STO) in the Ohmically heated WT-3 tokamak are strongly modified or suppressed by localized-electron cyclotron resonance heating (ECH) near the q=1 surface, where q refers to the safety factor. The efect of ECH is much stronger when it is applied on the high-field side as compared to the low-field side. Complete suppression of the STO is achieved for the duration of the ECH, in most cases, when it is applied on the high-field side of a low-density plasma, provided the ECH power exceeds a threshold value. The STO stabilization is attributed to a modification of the current-density profile by hot electrons generated by ECH, which reduces the shear in the q=1 region.",

author = "K. Hanada and H. Tanaka and M. Iida and S. Ide and T. Minami and M. Nakamura and T. Maekawa and Y. Terumichi and S. Tanaka and M. Yamada and J. Manickam and White, {R. B.}",

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doi = "10.1103/PhysRevLett.66.1974",

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T1 - Sawtooth stabilization by localized electron cyclotron heating in a tokamak plasma

AU - Hanada, K.

AU - Tanaka, H.

AU - Iida, M.

AU - Ide, S.

AU - Minami, T.

AU - Nakamura, M.

AU - Maekawa, T.

AU - Terumichi, Y.

AU - Tanaka, S.

AU - Yamada, M.

AU - Manickam, J.

AU - White, R. B.

PY - 1991

Y1 - 1991

N2 - Sawtooth oscillations (STO) in the Ohmically heated WT-3 tokamak are strongly modified or suppressed by localized-electron cyclotron resonance heating (ECH) near the q=1 surface, where q refers to the safety factor. The efect of ECH is much stronger when it is applied on the high-field side as compared to the low-field side. Complete suppression of the STO is achieved for the duration of the ECH, in most cases, when it is applied on the high-field side of a low-density plasma, provided the ECH power exceeds a threshold value. The STO stabilization is attributed to a modification of the current-density profile by hot electrons generated by ECH, which reduces the shear in the q=1 region.

AB - Sawtooth oscillations (STO) in the Ohmically heated WT-3 tokamak are strongly modified or suppressed by localized-electron cyclotron resonance heating (ECH) near the q=1 surface, where q refers to the safety factor. The efect of ECH is much stronger when it is applied on the high-field side as compared to the low-field side. Complete suppression of the STO is achieved for the duration of the ECH, in most cases, when it is applied on the high-field side of a low-density plasma, provided the ECH power exceeds a threshold value. The STO stabilization is attributed to a modification of the current-density profile by hot electrons generated by ECH, which reduces the shear in the q=1 region.

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Sawtooth stabilization by localized electron cyclotron heating in a tokamak plasma

Abstract

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