Evolution of the pedestal on MAST and the implications for ELM power loadings

A. Kirk; G. F. Counsell; G. Cunningham; J. Dowling; M. Dunstan; H. Meyer; M. Price; S. Saarelma; R. Scannell; M. Walsh; H. R. Wilson

doi:10.1088/0741-3335/49/8/011

Evolution of the pedestal on MAST and the implications for ELM power loadings

A. Kirk, G. F. Counsell, G. Cunningham, J. Dowling, M. Dunstan, H. Meyer, M. Price, S. Saarelma, R. Scannell, M. Walsh, H. R. Wilson

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Abstract

Studies of the pedestal characteristics and quantities determining edge-localized mode (ELM) energy losses in MAST are presented. High temperature pedestal plasmas have been achieved which have collisionalities one order of magnitude lower than previous results . A stability analysis performed on these plasmas shows them to be near the ballooning limit. The fraction of pedestal energy released by an ELM as a function of collisionality on MAST is consistent with data from other devices. The evolution of the filamentary structures observed during ELMs has been studied and has shown that they exist near to the last closed flux surface for the time over which the majority of particles and energy are being released from the pedestal region into the scrape off layer. A simple model has been developed, which is in reasonable agreement with the observed ELM energy losses and target profiles.

Original language	English
Article number	011
Pages (from-to)	1259-1275
Number of pages	17
Journal	Plasma Physics and Controlled Fusion
Volume	49
Issue number	8
DOIs	https://doi.org/10.1088/0741-3335/49/8/011
State	Published - Aug 1 2007
Externally published	Yes

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title = "Evolution of the pedestal on MAST and the implications for ELM power loadings",

abstract = "Studies of the pedestal characteristics and quantities determining edge-localized mode (ELM) energy losses in MAST are presented. High temperature pedestal plasmas have been achieved which have collisionalities one order of magnitude lower than previous results . A stability analysis performed on these plasmas shows them to be near the ballooning limit. The fraction of pedestal energy released by an ELM as a function of collisionality on MAST is consistent with data from other devices. The evolution of the filamentary structures observed during ELMs has been studied and has shown that they exist near to the last closed flux surface for the time over which the majority of particles and energy are being released from the pedestal region into the scrape off layer. A simple model has been developed, which is in reasonable agreement with the observed ELM energy losses and target profiles.",

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T1 - Evolution of the pedestal on MAST and the implications for ELM power loadings

AU - Kirk, A.

AU - Counsell, G. F.

AU - Cunningham, G.

AU - Dowling, J.

AU - Dunstan, M.

AU - Meyer, H.

AU - Price, M.

AU - Saarelma, S.

AU - Scannell, R.

AU - Walsh, M.

AU - Wilson, H. R.

PY - 2007/8/1

Y1 - 2007/8/1

N2 - Studies of the pedestal characteristics and quantities determining edge-localized mode (ELM) energy losses in MAST are presented. High temperature pedestal plasmas have been achieved which have collisionalities one order of magnitude lower than previous results . A stability analysis performed on these plasmas shows them to be near the ballooning limit. The fraction of pedestal energy released by an ELM as a function of collisionality on MAST is consistent with data from other devices. The evolution of the filamentary structures observed during ELMs has been studied and has shown that they exist near to the last closed flux surface for the time over which the majority of particles and energy are being released from the pedestal region into the scrape off layer. A simple model has been developed, which is in reasonable agreement with the observed ELM energy losses and target profiles.

AB - Studies of the pedestal characteristics and quantities determining edge-localized mode (ELM) energy losses in MAST are presented. High temperature pedestal plasmas have been achieved which have collisionalities one order of magnitude lower than previous results . A stability analysis performed on these plasmas shows them to be near the ballooning limit. The fraction of pedestal energy released by an ELM as a function of collisionality on MAST is consistent with data from other devices. The evolution of the filamentary structures observed during ELMs has been studied and has shown that they exist near to the last closed flux surface for the time over which the majority of particles and energy are being released from the pedestal region into the scrape off layer. A simple model has been developed, which is in reasonable agreement with the observed ELM energy losses and target profiles.

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Evolution of the pedestal on MAST and the implications for ELM power loadings

Abstract

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