Development of a 32-channel Beam Emission Spectroscopy diagnostic based on Neutral Beam Injection on HL-2A tokamak

Development of a 32-channel Beam Emission Spectroscopy diagnostic based on Neutral Beam Injection on HL-2A tokamak
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基于 HL-2A 托卡马克中性束注入的 32 通道束发射光谱诊断的开发

DOI:
10.1016/j.fusengdes.2020.111734
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发表时间:
2020-07
影响因子:
1.7
通讯作者:
M.Y. Ye
M.Y. Ye
中科院分区:
工程技术3区
文献类型:
--
作者:
Y.F. Wu;G.R. McKee;Y. Yu;R. Ke;Z. Yan;K. Jaehnig;Min Xu;M. Kriete;L.A. Morton;X.J. Qin;L. Nie;T. Wu;A.P. Sun;T. Lan;B.D. Yuan;H. Liu;S.B. Gong;T. Long;X.R. Duan;M.Y. Ye

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摘要在HL-2A装置上安装并运行了一套32道束流发射光谱诊断装置。它覆盖了等离子体内部径向32 cm(r=12cm/ρ=0.27到r=44cm/ρ=0.98)和极向27 cm(从-13.5 cm到+13.5 cm)的宽空间范围,提供了测量不同空间位置密度波动的能力。它具有高的时间分辨率,2 MHz和良好的空间分辨率,径向约1 cm,极向约1.2 cm。设计了一个带有135个槽的2D光纤支架,并将其安装在曲面成像平面上。每个缝隙对应于等离子体内部不同的空间位置。BES通道可以根据需要放置在任何插槽中,以进行所需的空间位置测量。在不重新设计采集光路和更换光学元件的情况下,可以将更多的通道添加到128个通道。首先,实验结果表明该系统在高信噪比下具有很好的性能。从二维快速成像可以测量和研究湍流涡动动力学。这将是未来HL-2A上等离子体湍流研究的一个敏锐的诊断工具。
Abstract A 32-channel Beam Emission Spectroscopy (BES) diagnostic has been installed and operated on HL-2A tokamak. It covers a wide spatial range of 32 cm in the radial direction (from r= 12 c m/ρ= 0.27 to r= 44 c m/ρ= 0.98) and 27 cm in the poloidal direction (from-13.5 cm to+ 13.5 cm) inside the plasma, providing a capability of measuring density fluctuations in different spatial locations. It has high temporal resolution, 2 MHz, and good spatial resolution, about 1 cm in radial direction and 1.2 cm in poloidal direction. A 2D fiber mount with 135 slots is designed and installed on the curved image plane. Each slot corresponds to a different spatial location inside the plasma. BES channels can be placed in any slots as needed for desired spatial location measurement. More channels can be added up to 128 channels without re-designing collecting optical path & replacing optical components. First experimental results have demonstrated great performance of the system with high signal to noise ratio. Turbulence eddy dynamics can be measured and studied from 2D fast imaging. It will be a keen diagnostic in future plasma turbulence research on HL-2A.
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