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Feasibility of a far infrared laser based polarimeter diagnostic system for the JT-60SA fusion experiment

机译：基于红外激光基极诊断系统的JT-60SA融合实验的可行性

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JT-60SA is the large Tokamak device that is being built in Japan under the Broader Approach Satellite Tokamak Programme and the Japanese National Programme and will operate as a satellite machine for ITER. The main goal of the JT-60SA Programme is to provide valuable information for the ITER steady-state scenario and for the design of DEMO, where the real-time control of the safety factor profile is very important, in connection with both MHD stability and plasma confinement. It has been demonstrated in this work that to this end polarimetry measurements are necessary, in particular in order to reconstruct the safety factor profile in reversed shear scenarios. In this paper we present the main steps of a conceptual feasibility study of a multi-channel polarimeter diagnostic and the resulting optimised geometry. In this study, magnetic scenario modelling, a realistic CAD-driven design and long-term operation requirements, rarely even considered at this stage, have been considered. It is shown that a far infrared polarimeter system, with a laser operating at a wavelength of 194.7 mu m and up to twelve channels can be envisaged for JT-60SA. The top requirements can be attained, i.e., that the polarimeter, together with other diagnostic measurements, should provide q-profile reconstruction with an accuracy of 10% for the entire plasma cycle and suitable time resolution for real-time applications, in particular in high density and ITER-relevant plasma scenarios.
机译：JT-60SA是在更广泛的方法卫星Tokamak计划和日本国家计划下正在日本建造的大型托卡马克装置，并将作为卫星机器运作。 JT-60SA计划的主要目标是为迭代稳态方案提供有价值的信息，并为演示设计提供了设计，其中安全因子配置文件的实时控制非常重要，与MHD稳定性有关等离子体约束。已经在这项工作中证明了这一点，这对于这种偏振测量测量是必要的，特别是为了重建反转剪切方案中的安全因子曲线。在本文中，我们介绍了多通道偏振仪诊断和所得优化几何形状的概念可行性研究的主要步骤。在本研究中，已经考虑了磁情景建模，逼真的CAD驱动的设计和长期运行要求，已经考虑在此阶段。结果表明，对于JT-60SA，可以设想在波长为194.7μm和高达12个通道的波长下操作的远红外偏振仪系统。可以获得顶部要求，即偏振仪与其他诊断测量一起，应提供Q型材重建，精度为整个等离子体循环和适用于实时应用的适当时间分辨率，特别是高密度和迭代相关的等离子体情景。

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