Letters: Characteristics of high frequency ELM precursors and edge stability in the PBX-M tokamak

S. M. Kaye; J. Manickam; N. Asakura; R. E. Bell; Yun Tung Lau; B. LeBlanc; C. E. Kessel; H. W. Kugel; S. F. Paul; S. Sesnic; H. Takahashi; Yun Tung Lau

doi:10.1088/0029-5515/30/12/016

Letters: Characteristics of high frequency ELM precursors and edge stability in the PBX-M tokamak

S. M. Kaye, J. Manickam, N. Asakura, R. E. Bell, Yun Tung Lau, B. LeBlanc, C. E. Kessel, H. W. Kugel, S. F. Paul, S. Sesnic, H. Takahashi, Yun Tung Lau

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Abstract

H-mode plasmas with high poloidal beta values in the PBX-M tokamak often exhibit periods of edge localized mode (ELM) activity, with each ELM preceded by a short duration (≤ 350 μs) burst of high frequency (200-250 kHz) magnetic activity. The burst grows on a time-scale of 10 μs and disappears just before the rapid increase in the D_α emission that is characteristic of the ELM. The burst of activity is observed at all poloidal locations, with the largest amplitudes at coils on the inner major radius side, indicating that the mode is not outward ballooning in character. Stability calculations indicate that this high frequency ELM precursor is probably the pressure driven ideal kink mode.

Original language	English (US)
Pages (from-to)	2621-2627
Number of pages	7
Journal	Nuclear Fusion
Volume	30
Issue number	12
DOIs	https://doi.org/10.1088/0029-5515/30/12/016
State	Published - Dec 1 1990

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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title = "Letters: Characteristics of high frequency ELM precursors and edge stability in the PBX-M tokamak",

abstract = "H-mode plasmas with high poloidal beta values in the PBX-M tokamak often exhibit periods of edge localized mode (ELM) activity, with each ELM preceded by a short duration (≤ 350 μs) burst of high frequency (200-250 kHz) magnetic activity. The burst grows on a time-scale of 10 μs and disappears just before the rapid increase in the Dα emission that is characteristic of the ELM. The burst of activity is observed at all poloidal locations, with the largest amplitudes at coils on the inner major radius side, indicating that the mode is not outward ballooning in character. Stability calculations indicate that this high frequency ELM precursor is probably the pressure driven ideal kink mode.",

author = "Kaye, \{S. M.\} and J. Manickam and N. Asakura and Bell, \{R. E.\} and Lau, \{Yun Tung\} and B. LeBlanc and Kessel, \{C. E.\} and Kugel, \{H. W.\} and Paul, \{S. F.\} and S. Sesnic and H. Takahashi and Lau, \{Yun Tung\}",

year = "1990",

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doi = "10.1088/0029-5515/30/12/016",

language = "English (US)",

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pages = "2621--2627",

journal = "Nuclear Fusion",

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TY - JOUR

T1 - Letters

T2 - Characteristics of high frequency ELM precursors and edge stability in the PBX-M tokamak

AU - Kaye, S. M.

AU - Manickam, J.

AU - Asakura, N.

AU - Bell, R. E.

AU - Lau, Yun Tung

AU - LeBlanc, B.

AU - Kessel, C. E.

AU - Kugel, H. W.

AU - Paul, S. F.

AU - Sesnic, S.

AU - Takahashi, H.

AU - Lau, Yun Tung

PY - 1990/12/1

Y1 - 1990/12/1

N2 - H-mode plasmas with high poloidal beta values in the PBX-M tokamak often exhibit periods of edge localized mode (ELM) activity, with each ELM preceded by a short duration (≤ 350 μs) burst of high frequency (200-250 kHz) magnetic activity. The burst grows on a time-scale of 10 μs and disappears just before the rapid increase in the Dα emission that is characteristic of the ELM. The burst of activity is observed at all poloidal locations, with the largest amplitudes at coils on the inner major radius side, indicating that the mode is not outward ballooning in character. Stability calculations indicate that this high frequency ELM precursor is probably the pressure driven ideal kink mode.

AB - H-mode plasmas with high poloidal beta values in the PBX-M tokamak often exhibit periods of edge localized mode (ELM) activity, with each ELM preceded by a short duration (≤ 350 μs) burst of high frequency (200-250 kHz) magnetic activity. The burst grows on a time-scale of 10 μs and disappears just before the rapid increase in the Dα emission that is characteristic of the ELM. The burst of activity is observed at all poloidal locations, with the largest amplitudes at coils on the inner major radius side, indicating that the mode is not outward ballooning in character. Stability calculations indicate that this high frequency ELM precursor is probably the pressure driven ideal kink mode.

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SP - 2621

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JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 12

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Letters: Characteristics of high frequency ELM precursors and edge stability in the PBX-M tokamak

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