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首页> 外文期刊>Review of Scientific Instruments >Supersonic helium beam diagnostic for fluctuation measurements of electron temperature and density at the Tokamak TEXTOR
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Supersonic helium beam diagnostic for fluctuation measurements of electron temperature and density at the Tokamak TEXTOR

机译：超声波氦气束诊断仪，用于测量托卡马克TEXTOR上电子温度和密度的波动

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摘要

A supersonic helium beam diagnostic, based on the line-ratio technique for high resolution electron density and temperature measurements in the plasma edge (r/a > 0.9) was designed, built, and optimised at TEXTOR (Torus Experiment for Technology Oriented Research). The supersonic injection system, based on the Campargue skimmer-nozzle concept, was developed and optimised in order to provide both a high neutral helium beam density of n0 = 1.5 × 1018 m-3 and a low beam divergence of ±1° simultaneously, achieving a poloidal resolution of Δpoloidal = 9 mm. The setup utilises a newly developed dead volume free piezo valve for operation in a high magnetic field environment of up to 2 T with a maximum repetition rate of 80 Hz. Gas injections are realised for a duration of 120 ms at a repetition rate of 2 Hz (duty cycle 1/3). In combination with a high sensitivity detection system, consisting of three 32 multi-channel photomultipliers (PMTs), measurements of edge electron temperature and density with a radial resolution of Δradial = 2 mm and a maximum temporal resolution of Δt ≃ 2 μs (470 kHz) are possible for the first time. The diagnostic setup at TEXTOR is presented. The newly developed injection system and its theoretical bases are discussed. The applicability of the stationary collisional-radiative model as basis of the line-ratio technique is shown. Finally, an example of a fluctuation analysis demonstrating the unique high temporal and spatial resolution capabilities of this new diagnostic is presented.
机译：在TEXTOR（面向技术的Torus实验）上，设计，构建和优化了基于线比率技术的超音速氦束诊断仪，用于等离子体边缘中的高分辨率电子密度和温度测量（r / a> 0.9）。基于Campargue分离器-喷嘴概念的超音速喷射系统已得到开发和优化，以提供n0 = 1.5×10 18 m -3 <的高中性氦束密度同时具有±1°的低光束发散度，实现了极点分辨率Δpoloidal= 9 mm。该设置采用了最新开发的无死体积压电阀，可在高达2 T的高磁场环境下运行，最大重复频率为80 Hz。气体喷射的持续时间为120 ms，重复频率为2 Hz（占空比1/3）。结合由三个32个多通道光电倍增管（PMT）组成的高灵敏度检测系统，可测量边缘电子温度和密度，其径向分辨率为Δradial= 2 mm，最大时间分辨率为Δt≃2μs（470 kHz） ）是第一次。介绍了TEXTOR的诊断设置。讨论了新开发的注射系统及其理论基础。展示了以线比率技术为基础的静态碰撞辐射模型的适用性。最后，给出了波动分析的示例，该示例演示了这种新诊断程序独特的高时空分辨率能力。

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