Design of multipulse Thomson scattering diagnostic for SST-1 tokamak.
Design of multipulse Thomson scattering diagnostic for SST-1 tokamak.
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DOI：
10.1063/1.2724775
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发表时间：
2007-04
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影响因子：
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通讯作者：
Ajai Kumar;C. Chavda;Y. Saxena;Ranjeet Singh;A. Thakar;Jinto Thomas;K. Patel;K. Pandya;V. Bedakihale
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文献类型：
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作者：
Ajai Kumar;C. Chavda;Y. Saxena;Ranjeet Singh;A. Thakar;Jinto Thomas;K. Patel;K. Pandya;V. Bedakihale
设计并研制了多脉冲Nd:YAG（钇铝石榴石）汤姆逊散射（TS）系统，用于测量SST-1托卡马克的电子温度（T(e)）和密度（n(e)）分布。该系统在等离子体的垂直、分流和水平（中层）区域工作，测量20 eV至1.5 keV的电子温度和10(18)-10(19)m（-3）的密度。六个Nd:YAG激光器与外部控制同步，用于获得三种不同的时间分辨率（30 Hz， 180 Hz和1 kHz）。整个系统在30米的距离内进行了对准稳定性和性能的实验室测试。不同的成像透镜组件被设计成将来自每个散射区域的散射光子成像到光纤阵列。设计、制作了一种低成本、紧凑的五通道干涉滤光多色器，并对其图像质量和滤光片传输特性进行了测试。利用雪崩光电二极管和所需的信号调理电子器件，研制了一种探测散射光子的系统。开发了一种基于PXI总线的数据采集与控制模块，用于实时数据采集和系统控制。本文详细介绍了TS子系统的设计与测试。
A multipulse Nd:YAG (Yttrium aluminum garnet) Thomson scattering (TS) system is designed and developed for measuring electron temperature (T(e)) and density (n(e)) profiles of SST-1 tokamak. The system operates at vertical, divertor, and horizontal (midplane) regions of plasma and measures the electron temperature of 20 eV to 1.5 keV and density of 10(18)-10(19) m(-3). Six Nd:YAG lasers synchronized with external control is used to get three different temporal resolutions (30 Hz, 180 Hz, and 1 kHz). The entire system is laboratory tested for the stability of alignment and performance over a distance of 30 m. Different imaging lens assemblies are designed to image the scattered photons from each of the scattering region to an array of optical fibers. A low cost and compact five-channel interference filter polychromator is designed, fabricated, and tested for its image quality and the filter transmission characteristics. Detection system with an avalanche photodiode and required signal conditioning electronics is developed for detecting the scattered photons. A data acquisition and control module operating on PXI bus is developed for the real time data acquisition and system control. A detailed description of design and testing of TS subsystems is presented in this article.