4.5 Article

RF wave coupling, plasma heating and characterization of induced plasma-material interactions in WEST L-mode discharges

期刊

NUCLEAR FUSION
卷 61, 期 8, 页码 -

出版社

IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/ac0d11

关键词

ICRH; WEST; plasma surface interaction; SOL; impurity sources; tungsten

资金

  1. Euratom research and training programme [633053]

向作者/读者索取更多资源

The study focuses on optimizing discharges heated with ICRF, including wave coupling, absorption optimization, and reducing impurity production. The results show that ICRF coupling can be optimized by increasing plasma density, wave frequency, and LH power. Additionally, absolutely calibrated visible spectroscopy sightlines are used to quantitatively estimate the contribution of different impurity sources to core contamination by tungsten during high total RF-power discharges.
Plasma heating in the full tungsten (W) environment in a steady-state tokamak (WEST) relies on electromagnetic waves in both the lower hybrid (LH) and ion cyclotron range of frequencies (ICRF). The present study focuses mostly on the optimization of discharges heated with ICRF, by reporting different methods to first optimize wave coupling, optimize their absorption and reduce the impurity production. It is shown that ICRF coupling can be optimized by moving the plasma closer to antennas, increasing the plasma density, wave frequency and LH power. We show that the absorption efficiency correlates with the hydrogen concentration with the existence of an optimum between 7% and 10% as expected for a minority heating scenario. Absolutely calibrated visible spectroscopy sightlines were used to monitor ion fluxes in different locations as part of an effort to quantitatively estimate the contribution of different impurity sources to the core contamination by tungsten. It is typically found that in discharges with high total RF-power (above 5 MW of LH and 3 MW of ICRF), divertor and antenna limiter sources can reach a similar order of magnitude during the ICRF phase.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.5
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据