The circuit of polychromator for Experimental Advanced Superconducting Tokamak edge Thomson scattering diagnostic
The circuit of polychromator for Experimental Advanced Superconducting Tokamak edge Thomson scattering diagnostic
复制标题
用于实验先进超导托卡马克边缘汤姆逊散射诊断的多色仪电路。
DOI：
10.1063/1.4820561
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发表时间：
2013-09-01
影响因子：
1.6
通讯作者：
Li, Fengjuan
中科院分区：
文献类型：
--
作者：
Zang, Qing;Hsieh, C. L.;Li, Fengjuan
探测器电路是汤姆逊散射诊断中用于散射光分析的滤光片多色仪的核心部件，对系统的精度和稳定性起着至关重要的作用。高信噪比和稳定性是诊断的主要要求。针对EAST边缘汤姆逊散射系统的弱光探测，设计了一种改进的探测器电路，可用于大电子温度梯度和低电子密度的测量。该电路采用热电致冷雪崩光电二极管辅助电路，提高了电路的稳定性和信噪比，特别是不受环境温度的影响。这些功能有望大大提高EAST Thomson诊断的准确性。电路的相关机械结构也进行了重新设计，以便散热和安装。所有参数都得到了优化，信噪比得到了显著提高。最小可探测光子数只有10个。
The detector circuit is the core component of filter polychromator which is used for scattering light analysis in Thomson scattering diagnostic, and is responsible for the precision and stability of a system. High signal-to-noise and stability are primary requirements for the diagnostic. Recently, an upgraded detector circuit for weak light detecting in Experimental Advanced Superconducting Tokamak (EAST) edge Thomson scattering system has been designed, which can be used for the measurement of large electron temperature (T(e)) gradient and low electron density (n(e)). In this new circuit, a thermoelectric-cooled avalanche photodiode with the aid circuit is involved for increasing stability and enhancing signal-to-noise ratio (SNR), especially the circuit will never be influenced by ambient temperature. These features are expected to improve the accuracy of EAST Thomson diagnostic dramatically. Related mechanical construction of the circuit is redesigned as well for heat-sinking and installation. All parameters are optimized, and SNR is dramatically improved. The number of minimum detectable photons is only 10.