Scaling studies of the high mode pedestal
Scaling studies of the high mode pedestal
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DOI：
10.1063/1.872849
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发表时间：
1998
影响因子：
2.2
通讯作者：
R. Groebner;T. Osborne
中科院分区：
文献类型：
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作者：
R. Groebner;T. Osborne
在DIII-D托卡马克装置中，对H模式（高模式）基座的结构和比例进行了检查[Plasma Physics and Controlled Fusion Research（International Atomic Energy Agency，维也纳，1986），第159页]。对于典型条件，离子温度Ti和电子温度Te的基座值是相当的。对主离子和C6+离子分布的测量表明，势垒中的离子压力梯度为氘等离子体电子压力梯度的50%-100%。屏障中的压力梯度的大小通常超过无限n气球模式理论的预测2倍。此外，通过自举电流，有限的压力梯度的作用，完全消除典型的放电气球稳定性限制。对于大型数据集，压力屏障的宽度δ最好用无量纲尺度δ/R（βpolped）0.4来描述，其中（βpolped）是极向β的基座值，R是长半径。基于极向离子回旋半径的定标。
The structure and scaling of the H-mode (high mode) pedestal are examined for discharges in the DIII-D tokamak [Plasma Physics and Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159]. For typical conditions, the pedestal values of the ion and electron temperatures Ti and Te are comparable. Measurements of main ion and C6+ profiles indicate that the ion pressure gradient in the barrier is 50%–100% of the electron pressure gradient for deuterium plasmas. The magnitude of the pressure gradient in the barrier often exceeds the predictions of infinite-n ballooning mode theory by a factor of 2. Moreover, via the bootstrap current, the finite pressure gradient acts to entirely remove ballooning stability limits for typical discharges. For a large dataset, the width of the pressure barrier δ is best described by the dimensionless scaling δ/R∝(βpolped)0.4 where (βpolped) is the pedestal value of poloidal beta and R is the major radius. Scalings based on the poloidal ion gyroradiu...