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Study and optimization of lower hybrid wave coupling in advanced scenario plasmas in JET

机译：JET高级情景等离子体中低杂波耦合的研究与优化

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摘要

Active current drive with lower hybrid (LH) waves in the advanced scenario plasmas at JET-EFDA was successful after a systematic study of the coupling problems that derive from the H-mode features of the edge plasma, namely very low density and ELM activity. The LH coupling has been improved compared to the past, by making the edge plasma in front of the LH launcher denser and more uniform. Injecting deuterated methane (CD4) from a nearby gas pipe increases the density in front of the LH launcher at least by a factor of 1.5, above the cut-off value for the LH frequency. A better matching of the plasma shape to that of the LH antenna makes the plasma ahead of the LH launcher more regular along the poloidal angle. These two techniques together have permitted a balanced supply of the three LH grills, with an average reflection below 4%, as in the previous L-mode operation. CD4 does-not affect the performances nor does it contaminate the main plasma up to the maximum flow rate so far used, Phi(CD4) > 10(22) el s(-1) and now it is routinely applied in JET (up to 4 MW have been injected for longer than 8 s) with very encouraging results for LHCD. Even though CD4 is not suitable for ITER for tritium retention, the possibility of controlling locally and safely the scrape-off plasma density has been demonstrated.
机译：在对由边缘等离子体的H模式特征引起的耦合问题（即非常低的密度和ELM活性）进行了系统研究之后，在JET-EFDA的高级情景等离子体中采用较低的混合（LH）波进行有源电流驱动是成功的。通过使LH发射器前面的边缘等离子体更密集，更均匀，与过去相比，LH耦合得到了改善。从附近的燃气管道注入氘化甲烷（CD4）会使LH发射器前方的密度增加至少1.5倍，高于LH频率的临界值。等离子体形状与LH天线形状的更好匹配使LH发射器之前的等离子体沿极向角更加规则。与之前的L模式操作一样，这两种技术共同允许三个LH格栅的平衡供应，平均反射率低于4％。 CD4不会影响性能，也不会污染主等离子体，直到目前为止使用的最大流速Phi（CD4）> 10（22）el s（-1），现在它已在JET中常规应用（直到注入4 MW的时间超过8 s），对于LHCD而言，结果令人鼓舞。即使CD4不适合用于保留for的ITER，也已证明可以局部安全地控制刮除的血浆密度。

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