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

被引：62

作者：

Kirk, A. ^{[1
]}

Counsell, G. F.

Cunningham, G.

Dowling, J.

Dunstan, M.

Meyer, H.

Price, M.

Saarelma, S.

Scannell, R.

Walsh, M.

Wilson, H. R.

机构：

[1] UKAEA Euratom Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[2] Dublin City Univ, Natl Univ Ireland Univ Coll Cork, Dept Elect & Elect Engn, Assoc EURATOM, Cork, Ireland

[3] Univ York, York YO10 5DD, N Yorkshire, England

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2007年 / 49卷 / 08期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1088/0741-3335/49/8/011

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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 (nu(ped)* = 0.03-0.1) one order of magnitude lower than previous results (v(ped)* 1-5). A stability performed 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.

引用

页码：1259 / 1275

页数：17

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