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首页> 外文期刊>Plasma physics and controlled fusion >On the interpretability and uncertainty propagation of polarimetric measurements in thermonuclear plasmas as a function of the input polarisation and laser wavelength
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On the interpretability and uncertainty propagation of polarimetric measurements in thermonuclear plasmas as a function of the input polarisation and laser wavelength

机译：关于热核等离子体中Polariemetric测量的解释性和不确定化传播作为输入极化和激光波长的函数

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摘要

Plasma polarimetry is a diagnostic technique used in nuclear fusion reactors to measure the line integral of some plasma parameters, such as the electron density and the magnetic field, and constrain, analyse and validate the equilibrium models. Despite the strong link between the plasma properties and light polarisation propagation, the interpretation of plasma polarimetry remains complex and sometimes uncertain. The type 1 approximation is the most common hypothesis used to link the polarisation effects, such as the Faraday rotation and the Cotton Mouton phase shift, with the plasma properties (electron density and magnetic fields). However, this approximation is valid only in specific conditions, which depend on both the plasma configuration and initial polarisation of the electromagnetic wave. Moreover, the uncertainty propagations of these measurements are affected by regions where their values are too high to guarantee accurate values, making the measurement unsuitable. The need to measure an unsteady physical environment, which goes from the condition of no plasma to the flat top of the discharge, makes the setting of the measurement more constrained. The aim of this work is to analyse, both analytically and numerically, the behaviours of the interpretability and uncertainty propagation of polarisation measurements, in order to give a detailed and the most general as possible description of these issues, ensuring an easier, more performant and reliable understanding and design of plasma polarimetry. The results will show that an input linear polarisation around 45 degrees degree is the most suitable for plasma polarimetry when type 1 approximation is adopted and which the choice of the laser wavelength governs the performances of the polarimeter.
机译：等离子体偏振基是用于核聚体反应器的诊断技术，以测量一些等离子体参数的线路整体，例如电子密度和磁场，以及约束，分析和验证平衡模型。尽管等离子体性能和光极化传播之间存在牢固的连接，但等离子体偏振率的解释仍然是复杂的并且有时不确定。类型1近似是最常见的假设，用于将偏振效果联系起来，例如法拉第旋转和棉质Mouton相移，具有等离子体特性（电子密度和磁场）。然而，该近似仅在特定条件下有效，这取决于电磁波的等离子体配置和初始偏振。此外，这些测量的不确定性传播受到它们的值太高而无法保证精确值的区域影响，使测量不适合。需要测量不稳定的物理环境，该环境从没有等离子体的条件到放电的平顶，使得测量的设置更加约束。这项工作的目的是分析和数值分析，偏振测量的解释性和不确定性传播的行为，以便为这些问题的可能描述提供详细和最普遍，确保更容易，更性能等离子体偏振子的可靠理解和设计。结果表明，当采用1型近似时，输入线性偏振率约为45度，最适合于等离子体偏振率，并且激光波长的选择治理偏振仪的性能。

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