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一个太赫兹固态源干扰仪-极极度计,用于EAST上的长脉冲放电

S X Wang¹, H Q Liu¹, J B Zhang¹

¹Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.

The Review of scientific instruments

|July 2, 2024

概括

一个新的0.65 THz固态源干扰仪-极极仪 (SSIP) 准确地测量了EAST托卡马克上的等离子体密度和法拉第旋转. 这种先进的系统与现有的诊断工具有很好的一致性.

科学领域:

等离子体物理学的物理学
融合能源研究融合能源研究
诊断技术诊断技术

背景情况:

准确的等离子体诊断对于理解和控制聚变等离子体至关重要.
现有的诊断系统在分辨率或测量能力方面可能存在局限性.

研究的目的:

引入和验证一种新的0.65 THz固态源干扰仪-极极仪 (SSIP) 用于血诊断.
评估SSIP在实验高级超导托卡马克 (EAST) 上进行线路集成密度和法拉第旋转测量的能力.

主要方法:

安装一个垂直查看的SSIP系统,使用三个独立的固态二极管源,以0.65 THz工作.
采用频率乘数器 (X48) 来产生探测束和优化高灵敏度混合器来检测中间频率 (IF).
实现低相位噪声的多通道测量,从而实现高分辨率密度和法拉第旋转的确定.

主要成果:

该SSIP实现了密度分辨率为3.3 × 10^17 m^-2和法拉第旋转分辨率约为1.5°.
密度测量在~0.85MHz的IF中成功地在一个流量为~300kA的等离子体中进行.
通过SSIP (3.5 × 10^19 m^-3) 测量的直线平均密度显示出与已建立的极极度仪-极度仪 (POINT) 和二氧化碳分散干扰仪系统有很强的一致性.

结论:

0.65 THz的SSIP是EAST的可行和准确的诊断工具.
该SSIP系统为关键等离子体参数提供高灵敏度和分辨率.
成功的验证证实了SSIP对未来核聚变研究的潜力.

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