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Dual-polarization single-chord plasma interferometry in stellarators/torsatrons
Review of Scientific Instruments ( IF 1.3 ) Pub Date : 2020-09-01 , DOI: 10.1063/5.0004033
V. Filippov 1 , D. Grekov 1, 2
Affiliation  

The well known ordinary wave based interferometry is of frequent use for plasma diagnostics in fusion facilities. With the probing direction being perpendicular to the magnetic field of the facility, the ordinary wave phase shift is proportional to the average density along the probing path at frequencies much higher than the plasma frequency of electrons. In the case of extraordinary waves, the phase shift depends on both the plasma density and the confining magnetic field. For the facilities of stellarator/torsatron types, the magnetic field is known; therefore, the measurement of the extraordinary wave phase shift can also provide information on the plasma density profile. The plasma density measurements with the use of dual-polarization interferometers were carried out on the Uragan-3M and Uragan-2M torsatrons. For correct interpretation of the experimental results, numerical simulation was performed to describe the probing wave propagation through the plasma in the magnetic field of variable direction. The transmitting-to-receiving horn scattering matrix has been obtained in a wide range of plasma parameters. In the course of the interpretation of measurements, restrictions on the use of the Wentzel-Kramers-Brillouin approximation were determined. This has made it possible to develop the optimized layout of the dual-polarization interferometer for measuring the plasma density in stellarators/torsatrons. The here proposed upgrade of the interferometers on Uragan-2M will enable one to obtain additional information on the temporal evolution of the plasma density.

中文翻译:

仿星器/扭转加速器中的双极化单弦等离子体干涉测量法

众所周知的基于普通波的干涉测量法经常用于聚变设施中的等离子体诊断。由于探测方向垂直于设施的磁场,普通波相移与沿探测路径的平均密度成正比,频率远高于电子的等离子体频率。在异常波的情况下,相移取决于等离子体密度和限制磁场。对于仿星器/扭振器类型的设施,磁场是已知的;因此,异常波相移的测量也可以提供有关等离子体密度分布的信息。使用双偏振干涉仪对 Uragan-3M 和 Uragan-2M 扭转加速器进行等离子体密度测量。为了正确解释实验结果,进行了数值模拟来描述探测波在变向磁场中通过等离子体的传播。发射到接收喇叭散射矩阵已在广泛的等离子体参数范围内获得。在解释测量值的过程中,确定了对使用 Wentzel-Kramers-Brillouin 近似的限制。这使得开发用于测量仿星器/扭转加速器中等离子体密度的双偏振干涉仪的优化布局成为可能。此处提议的 Uragan-2M 干涉仪升级将使人们能够获得有关等离子体密度随时间演变的更多信息。进行了数值模拟来描述探测波在可变方向磁场中通过等离子体的传播。发射到接收喇叭散射矩阵已在广泛的等离子体参数范围内获得。在解释测量值的过程中,确定了对使用 Wentzel-Kramers-Brillouin 近似的限制。这使得开发用于测量仿星器/扭转加速器中等离子体密度的双偏振干涉仪的优化布局成为可能。此处提议的 Uragan-2M 干涉仪升级将使人们能够获得有关等离子体密度随时间演变的更多信息。进行了数值模拟来描述探测波在可变方向磁场中通过等离子体的传播。发射到接收喇叭散射矩阵已在广泛的等离子体参数范围内获得。在解释测量值的过程中,确定了对使用 Wentzel-Kramers-Brillouin 近似的限制。这使得开发用于测量仿星器/扭转加速器中等离子体密度的双偏振干涉仪的优化布局成为可能。此处提议的 Uragan-2M 干涉仪升级将使人们能够获得有关等离子体密度随时间演变的更多信息。发射到接收喇叭散射矩阵已在广泛的等离子体参数范围内获得。在解释测量值的过程中,确定了对使用 Wentzel-Kramers-Brillouin 近似的限制。这使得开发用于测量仿星器/扭转加速器中等离子体密度的双偏振干涉仪的优化布局成为可能。此处提议的 Uragan-2M 干涉仪升级将使人们能够获得有关等离子体密度随时间演变的更多信息。发射到接收喇叭散射矩阵已在广泛的等离子体参数范围内获得。在解释测量值的过程中,确定了对使用 Wentzel-Kramers-Brillouin 近似的限制。这使得开发用于测量仿星器/扭转加速器中等离子体密度的双偏振干涉仪的优化布局成为可能。此处提议的 Uragan-2M 干涉仪升级将使人们能够获得有关等离子体密度随时间演变的更多信息。这使得开发用于测量仿星器/扭转加速器中等离子体密度的双偏振干涉仪的优化布局成为可能。此处提议的 Uragan-2M 干涉仪升级将使人们能够获得有关等离子体密度随时间演变的更多信息。这使得开发用于测量仿星器/扭转加速器中等离子体密度的双偏振干涉仪的优化布局成为可能。此处提议的 Uragan-2M 干涉仪升级将使人们能够获得有关等离子体密度随时间演变的更多信息。
更新日期:2020-09-01
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