• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plasma physics and controlled fusion >Effect of gas injection during LH wave coupling at ITER-relevant plasma-wall distances in JET
【24h】

Effect of gas injection during LH wave coupling at ITER-relevant plasma-wall distances in JET

机译：在JET中与ITER相关的等离子-壁距下LH波耦合过程中注气的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Good coupling of lower hybrid (LH) waves has been demonstrated in different H-mode scenarios in JET, at high triangularity (delta similar to 0.4) and at large distance between the last closed flux surface and the LH launcher ( up to 15 cm). Local gas injection of D-2 in the region magnetically connected to the LH launcher is used for increasing the local density in the scrape-off layer ( SOL). Reciprocating Langmuir probe measurements magnetically connected to the LH launcher indicate that the electron density profile flattens in the far SOL during gas injection and LH power application. Some degradation in normalized H-mode confinement, as given by the H98(gamma,2)-factor, could be observed at high gas injection rates in these scenarios, but this was rather due to total gas injection and not specifically to the local gas puffing used for LH coupling. Furthermore, experiments carried out in L-mode plasmas in order to evaluate the effect on the LH current drive efficiency, when using local gas injection to improve the coupling, indicate only a small degradation (Delta I-LH/I-LH similar to 15%). This effect is largely compensated by the improvement in coupling and thus increase in coupled power when using gas puffing.
机译：在JET的不同H模式场景中，在高三角形度（δ近似于0.4）以及最后一个封闭通量表面与LH发射器之间的距离很远（最大15 cm）处，已经证明了低杂波（LH）波的良好耦合。 。在磁性连接到LH发射器的区域中，D-2的局部气体注入用于增加刮除层（SOL）中的局部密度。磁性连接到LH发射器的往复式Langmuir探针测量表明，在气体注入和LH功率施加期间，远SOL中的电子密度分布趋于平坦。在这些情况下，在高注气速率下，可以观察到由H98（γ，2）因子给出的归一化H模式限制的某些降低，但这是由于总注气而不是局部气体引起的。用于LH耦合的膨化。此外，在L型等离子体中进行的实验旨在评估对LH电流驱动效率的影响，当使用局部气体注入来改善耦合时，表明只有很小的降解（ΔI-LH / I-LH类似于15 ％）。这种效果在很大程度上由联轴器的改善来补偿，因此在使用充气时增加了联轴器的功率。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号