4.5 Article

Development of beam emission spectroscopy in the helically symmetric experiment stellarator

期刊

REVIEW OF SCIENTIFIC INSTRUMENTS
卷 92, 期 6, 页码 -

出版社

AMER INST PHYSICS
DOI: 10.1063/5.0043596

关键词

-

资金

  1. JSPS [19H01875]
  2. PLADyS JSPS Core-to-Core Program, A. Advanced Research Networks
  3. Japan/U.S. Cooperation in Fusion Research and Development
  4. Future Energy Research Association
  5. Grants-in-Aid for Scientific Research [19H01875] Funding Source: KAKEN

向作者/读者索取更多资源

This study demonstrates the feasibility of using BES diagnostic in the HSX stellarator to obtain the spatiotemporal structure of density fluctuation, by designing and optimizing viewing chords and estimating beam emission spectrum through simulation. Experimental results show that measuring beam emission in HSX plasmas using BES is feasible, with potential to improve system signal-to-noise ratio for higher frequency wave measurements.
This study shows the feasibility of a beam emission spectroscopy (BES) diagnostic in the Helically Symmetric eXperiment (HSX) stellarator for obtaining the spatiotemporal structure of density fluctuation. A beam emission simulation was applied to HSX plasmas to design and optimize viewing chords and to estimate the beam emission spectrum. A Doppler-shifted beam emission spectrum was measured from a 30 kV, 4 A diagnostic neutral beam injected into HSX plasmas. The beam emission was measured with a high-time-resolution avalanche photodiode (APD) assembly to determine the feasibility of BES in HSX. For HSX plasmas heated by 28 GHz electron cyclotron heating, a mode around f = 15 kHz was observed in the BES signal. The coherence between the BES signal and the density fluctuation measured by an interferometer system was significant. A plan for improving the BES system to enable the measurement of higher frequency related to turbulent transport is presented. The array of sightlines proposed in this study can be used to measure beam emission with a Doppler shift larger than 3 nm (blue shift), which enables the use of a wide passband interference filter to obtain higher throughput. The adoption of a large objective optics and a chilled APD assembly will improve the signal-to-noise ratio.

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