Temporal behavior of the electron density profile in the scrape-off layer of neutral-beam-heated ASDEX plasmas
Temporal behavior of the electron density profile in the scrape-off layer of neutral-beam-heated ASDEX plasmas
复制标题
中性束加热 ASDEX 等离子体刮除层中电子密度分布的时间行为
DOI：
10.1016/0022-3115(84)90102-8
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发表时间：
1984
影响因子：
3.1
通讯作者：
M. E. Shaer
中科院分区：
文献类型：
--
作者：
ASDEX;Ni Team;K. Mccormick;H. Murmann;M. E. Shaer
给出了NI加热放电周边区域的密度测量结果。大多数结果是通过一项新技术获得的，该技术利用60keV的中性锂束流，连续地产生与密度分布相关的分布。NI的最初结果是粒子约束时间(L相)的恶化，表现为分界线外的密度e折叠长度∼n增加40%；可能在分界线内的密度略有降低。在获得具有更好约束性能的H相的同时，λn值突然下降到欧姆相的典型值；有迹象表明，分隔线附近的密度梯度甚至更陡峭。随后边缘密度的增加被脉冲串间歇地中断，在每个脉冲串结束时，导致刮出层和至少是紧接在分离线内的区域的减少。
Density measurements in the peripheral region of a NI heated discharge are presented. Most of the results are obtained via a new technique utilizing a 60 keV neutral lithium beam which yields profiles — on a continuous basis — that can be related to the density profile. The initial consequence of NI is a deterioration of the particle confinement time (L-phase) which manifests itself as an ∼ 40% increase in the density e-folding length λnoutside the separatrix; possibly, there is a slight decrease in density inside the separatrix. Attainment of the H-phase with its better confinement properties is accompanied by an abrupt decrease inλnto a value typical of the Ohmic phase; there are indications that the density gradient near the separatrix is even steeper. The subsequent increase in edge density is then intermittently interrupted by bursts which, at the conclusion of each burst, lead to a reduction inneof the scrape-off layer and at least the region immediately inside the separatrix.