Evolution of the pedestal on MAST and the implications for ELM power loadings
Evolution of the pedestal on MAST and the implications for ELM power loadings
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DOI：
10.1088/0741-3335/49/8/011
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发表时间：
2007-08-01
影响因子：
2.2
通讯作者：
Wilson, H. R.
中科院分区：
文献类型：
--
作者：
Kirk, A.;Counsell, G. F.;Wilson, H. R.
研究了MAST中边缘局域模（ELM）能量损耗的基座特性和决定参量。高温基座等离子体已经实现，其具有碰撞性（nu（ped）* = 0.03-0.1）比以前的结果（v（ped）* 1-5）低一个数量级。对这些血浆进行的稳定性分析表明，其接近球囊膨胀限度。由ELM释放的基座能量的分数作为MAST上的碰撞性的函数与来自其他设备的数据是一致的。已经研究了在ELMs期间观察到的非线性结构的演变，并且已经表明它们存在于最后一个封闭的通量表面附近，在该时间内，大部分粒子和能量从基座区域释放到刮除层中。已经开发了一个简单的模型，这是在合理的协议与所观察到的ELM能量损失和目标配置文件。
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.