Scaling of density fluctuations in PDX
Scaling of density fluctuations in PDX
复制标题
PDX 中密度波动的缩放
DOI：
10.1088/0029-5515/25/5/001
复制
发表时间：
1985
期刊：
影响因子：
--
通讯作者：
E. Mazzucato
中科院分区：
文献类型：
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作者：
T. Crowley;E. Mazzucato
在PDX托卡马克中，利用2毫米微波散射研究了湍流密度波动与漂波特性的标度。作者已经测量了频谱、k⊥频谱和波动幅度如何随环面场、中性束加热功率、等离子体电流、PDX中的位置和约束制度而变化。由于湍流是PDX和其他托卡马克异常热损失的可能原因，湍流的标度与能量约束标度进行了比较。在许多情况下，波动水平的增加与能量约束的减少有关。在一种情况下，涨落水平不随等离子体约束特性的改变而改变。比较了不同漂波参数下实验波动水平的标度。我们发现，在某些数据集中，波动水平的尺度为混合长度极限ñ/n ~ l/k⊥Ln，而在其他数据集中则不是。
The scaling of turbulent density fluctuations with drift-wave characteristics has been examined in the PDX tokamak using scattering of 2 mm microwaves. The authors have measured how the frequency spectra, the k⊥ spectra and the magnitude of the fluctuations vary with toroidal field, neutral beam heating power, plasma current, position and confinement regime in PDX. Since turbulence is a possible cause of anomalous heat loss in PDX and other tokamaks, the scaling of the turbulence is compared with energy confinement scalings. In many cases, an increased fluctuation level is correlated with decreased energy confinement. In one case, the fluctuation level does not change as the confinement properties of the plasma change. The scaling of the experimental fluctuation levels is compared with various drift-wave parameters. It is found that the fluctuation level scales as the mixing-length limit, ñ/n ∼ l/k⊥Ln, in some sets of data, but not in other sets.