Observations and empirical scalings of the high-confinement mode pedestal on Alcator C-Mod
Observations and empirical scalings of the high-confinement mode pedestal on Alcator C-Mod
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DOI：
10.1063/1.1486224
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发表时间：
2002-06
影响因子：
2.2
通讯作者：
J. Hughes;D. Mossessian;A. Hubbard;B. LaBombard;E. Marmar
中科院分区：
文献类型：
--
作者：
J. Hughes;D. Mossessian;A. Hubbard;B. LaBombard;E. Marmar
在Alcator C-Mod托卡马克装置上[Phys. Plasmas 1，1511（1994）]，利用毫米分辨率的汤姆逊散射测量了等离子体边缘的电子温度（Te）和密度（ne）的径向分布[Rev. Sci.仪器。72，1107（2001）]。在高限制状态（H模式）中的边缘输运势垒表现出典型宽度为2-6 mm的Te，ne基座，其中Te基座平均略宽于ne基座并且在ne基座内部。基座顶部和底部的测量结果与使用其他诊断方法获得的轮廓一致。C-Mod上的两个主要H模区域，增强Dα（EDA）和边缘局域模自由，已经被检查了在能量上的差异。除了高边缘安全系数q95之外，EDA操作还受到高边缘碰撞性ν* 的青睐。在固定形状的缩放研究产量小的系统变化的基座宽度与等离子体参数，虽然较高的三角形被认为是显着增加东北基座宽度。基座高度和坡度...
On the Alcator C-Mod tokamak [Phys. Plasmas 1, 1511 (1994)], radial profiles of electron temperature (Te) and density (ne) are measured at the plasma edge with millimeter resolution Thomson scattering [Rev. Sci. Instrum. 72, 1107 (2001)]. Edge transport barriers in the high confinement regime (H mode) exhibit Te, ne pedestals with typical widths of 2–6 mm, with the Te pedestal on average slightly wider than and inside the ne pedestal. Measurements at both the top and the base of the pedestal are consistent with profiles obtained using other diagnostics. The two primary H-mode regimes on C-Mod, enhanced Dα (EDA) and edge-localized mode free, have been examined for differences in pedestals. EDA operation is favored by high edge collisionality ν*, in addition to high edge safety factor q95. Scaling studies at fixed shape yield little systematic variation of pedestal widths with plasma parameters, though higher triangularity is seen to increase the ne pedestal width dramatically. Pedestal heights and gradient...