H-mode pedestal characteristics on MAST

A. Kirk; G. F. Counsell; E. Arends; H. Meyer; D. Taylor; M. Valovic; M. Walsh; H. Wilson

doi:10.1088/0741-3335/46/5A/020

H-mode pedestal characteristics on MAST

A. Kirk, G. F. Counsell, E. Arends, H. Meyer, D. Taylor, M. Valovic, M. Walsh, H. Wilson

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

36 Scopus citations

Abstract

The H-mode pedestal characteristics on the mega ampère spherical tokamak (MAST) are measured in a variety of disconnected double null discharges and the effect of edge localized modes (ELMs) on the pedestal is presented. The edge density pedestal width in spatial co-ordinates is similar on both the inboard and outboard sides. Neutral penetration may be able to explain the density pedestal width but it alone cannot explain the characteristics of the temperature pedestal. The data from MAST can be used to improve temperature pedestal width scalings by extending the ranges in pedestal collisionality, magnetic field, elongation and aspect ratio studied by other machines. Convective transport is found to dominate energy losses during ELMs and the fractional loss of pedestal energy during an ELM on MAST correlates better with SOL ion transit time than with pedestal collisionality.

Original language	English
Pages (from-to)	A187-A194
Journal	Plasma Physics and Controlled Fusion
Volume	46
Issue number	5 SUPPL. A
DOIs	https://doi.org/10.1088/0741-3335/46/5A/020
State	Published - May 2004
Externally published	Yes

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title = "H-mode pedestal characteristics on MAST",

abstract = "The H-mode pedestal characteristics on the mega amp{\`e}re spherical tokamak (MAST) are measured in a variety of disconnected double null discharges and the effect of edge localized modes (ELMs) on the pedestal is presented. The edge density pedestal width in spatial co-ordinates is similar on both the inboard and outboard sides. Neutral penetration may be able to explain the density pedestal width but it alone cannot explain the characteristics of the temperature pedestal. The data from MAST can be used to improve temperature pedestal width scalings by extending the ranges in pedestal collisionality, magnetic field, elongation and aspect ratio studied by other machines. Convective transport is found to dominate energy losses during ELMs and the fractional loss of pedestal energy during an ELM on MAST correlates better with SOL ion transit time than with pedestal collisionality.",

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T1 - H-mode pedestal characteristics on MAST

AU - Kirk, A.

AU - Counsell, G. F.

AU - Arends, E.

AU - Meyer, H.

AU - Taylor, D.

AU - Valovic, M.

AU - Walsh, M.

AU - Wilson, H.

PY - 2004/5

Y1 - 2004/5

N2 - The H-mode pedestal characteristics on the mega ampère spherical tokamak (MAST) are measured in a variety of disconnected double null discharges and the effect of edge localized modes (ELMs) on the pedestal is presented. The edge density pedestal width in spatial co-ordinates is similar on both the inboard and outboard sides. Neutral penetration may be able to explain the density pedestal width but it alone cannot explain the characteristics of the temperature pedestal. The data from MAST can be used to improve temperature pedestal width scalings by extending the ranges in pedestal collisionality, magnetic field, elongation and aspect ratio studied by other machines. Convective transport is found to dominate energy losses during ELMs and the fractional loss of pedestal energy during an ELM on MAST correlates better with SOL ion transit time than with pedestal collisionality.

AB - The H-mode pedestal characteristics on the mega ampère spherical tokamak (MAST) are measured in a variety of disconnected double null discharges and the effect of edge localized modes (ELMs) on the pedestal is presented. The edge density pedestal width in spatial co-ordinates is similar on both the inboard and outboard sides. Neutral penetration may be able to explain the density pedestal width but it alone cannot explain the characteristics of the temperature pedestal. The data from MAST can be used to improve temperature pedestal width scalings by extending the ranges in pedestal collisionality, magnetic field, elongation and aspect ratio studied by other machines. Convective transport is found to dominate energy losses during ELMs and the fractional loss of pedestal energy during an ELM on MAST correlates better with SOL ion transit time than with pedestal collisionality.

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H-mode pedestal characteristics on MAST

Abstract

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