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首页> 外文期刊>Plasma physics and controlled fusion >Edge density profile measurements by X-mode reflectometry on Tore Supra
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Edge density profile measurements by X-mode reflectometry on Tore Supra

机译:通过Tore Supra上的X模式反射法测量边缘密度轮廓

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摘要

A broadband reflectometer operating in the frequency range 50-75 GHz has been developed on Tore Supra to measure electron density profiles at the edge. The system uses extraordinary mode polarization and performs routine measurements in 20 mus with heterodyne detection to ensure a high dynamic range sensitivity. It allows separate phase and amplitude information of the signal. The density profiles are fully automatically calculated from the raw phase. The initialization is done with automatic detection of the first cut-off from the amplitude of the reflected signal with an accuracy of up to +/-0.5 cm. The profiles are now part of the public database of Tore Supra and can provide details of density structures better than the centimetre range. The high reliability of the measurements for various plasma conditions make this diagnostic an ideal tool to study specific edge plasma physics with given examples on detached plasma behaviour and antenna-plasma coupling processes for ion cyclotron resonant frequency and lower hybrid heating powers. It also is shown how the presence of suprathermal electrons may perturb the measurements. [References: 27]
机译:在Tore Supra上开发了工作在50-75 GHz频率范围内的宽带反射仪,以测量边缘的电子密度分布。该系统使用非常规模式极化,并通过外差检测在20 mus中执行常规测量,以确保高动态范围灵敏度。它允许单独的信号相位和幅度信息。密度分布完全由原始相自动计算得出。初始化是通过自动检测反射信号的幅度中的第一个截止点来完成的,精度高达+/- 0.5 cm。这些配置文件现在是Tore Supra公共数据库的一部分,可以提供比厘米范围更好的密度结构的详细信息。各种等离子体条件下测量结果的高度可靠性使该诊断成为研究特定边缘等离子体物理的理想工具,并给出了离子等离子体回旋共振频率和较低混合加热功率的分离等离子体行为和天线-等离子体耦合过程的示例。还显示了超热电子的存在如何干扰测量。 [参考:27]

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