Heating and current drive by electron cyclotron waves in JT-60U
Heating and current drive by electron cyclotron waves in JT-60U
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DOI：
10.1088/0029-5515/44/7/002
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发表时间：
2004-05
期刊：
影响因子：
3.3
通讯作者：
Toshihiro Suzuki;S. Ide;K. Hamamatsu;A. Isayama;T. Fujita;C. Petty;Y. Ikeda;K. Kajiwara;O. Naito;M. Seki;S. Moriyama;T. Hatae;T. Kondoh
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文献类型：
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作者：
Toshihiro Suzuki;S. Ide;K. Hamamatsu;A. Isayama;T. Fujita;C. Petty;Y. Ikeda;K. Kajiwara;O. Naito;M. Seki;S. Moriyama;T. Hatae;T. Kondoh
本文介绍了JT-60 U中电子回旋波加热和驱动电流的研究结果。高达26千电子伏的电子温度，测量ECE诊断，实现了通过注入EC波的中心产生的反向剪切等离子体的低杂波（LH）波。在ρ < 0.3的范围内，电子温度Te超过24 keV，其中ρ是归一化的小半径。EC驱动的电流分布测量在高Te高达21千电子伏，而不使用LH波，并被发现是空间本地化。ECCD（电流驱动）效率ηCD随着Te的增加而增加，在Te = 21 keV时达到0.42 × 1019 A W−1 m−2。还研究了归一化CD效率对沉积位置的依赖性，以优化CD效率，因为强烈依赖于沉积位置的捕获粒子效应预计会降低CD效率。该效应是从较低磁场沉积中的α的显著降低中检测到的，这与线性化的福克-普朗克计算一致。对于相同的Te，测量的CD效率随电子密度ne的增加而增加，与线性计算相比，这表明对ne的依赖性更强。进一步的离轴ECCD分布在约一半的小半径进行了测量，显示出相当好的协议与线性计算。
The results of studies on heating and current drive by the electron cyclotron (EC) waves in JT-60U are presented. An electron temperature of up to 26 keV, as measured by ECE diagnostics, was achieved by injecting EC waves into the centre of a reversed shear plasma produced by the lower hybrid (LH) waves. The electron temperature Te exceeds 24 keV in the region ρ < 0.3, where ρ is the normalized minor radius. The EC driven current profile was measured at high Te up to 21 keV without using LH waves, and was found to be spatially localized. The ECCD (current drive) efficiency ηCD increased with Te and reached 0.42 × 1019 A W−1 m−2 at Te = 21 keV. The dependence of normalized CD efficiency on deposition location was also studied to optimize the CD efficiency, since the trapped particle effect, which depends strongly on deposition location, is expected to reduce ζ. The effect was detected from a significant decrease in ζ in the lower magnetic field deposition, which is consistent with a linearized Fokker–Planck calculation. The measured CD efficiency ζ increased with electron density ne for the same Te, which showed a stronger dependence on ne compared with the linear calculation. Further off-axis ECCD profile at about half of the minor radius was measured, showing fairly good agreement with linear calculation.