We have proposed a new approach for equilibrium reconstruction that can be applied to ITER-like burning plasmas. In this study, we have focused on carrying out equilibrium reconstruction using polarimetry, which is feasible for ITER-like burning plasmas. Polarimetry in burning plasmas is different from that in the existing tokamaks in two regards: (1) increased importance of the relativistic effects and (2) significant coupling with the Faraday and Cotton–Mouton effects. We found that when polarimetric data (orientation angle, θ, and ellipticity angle, , of a polarization state) are used as the constraints in the equilibrium reconstruction, the optimum weighting factors for θ and depend on the magnetic surfaces through which the viewing chord of polarimetry passes. We applied our approach to the operation scenarios II (S2) and IV (S4) in ITER. In the case where the viewing chords are via both the equatorial and upper ports, the measurement requirements for the accuracy of the q-profile in ITER (±10%) were satisfied in S2 and S4 when the measuring errors of θ and were less than 0.5° and 3°, respectively.
我提出了一种新的方法，用于平衡重建，该方法可应用于类似ITER的燃烧等离子体。在本研究中，我们重点进行了利用偏振测量进行平衡重建，该方法适用于类似ITER的燃烧等离子体。与现有托卡马克中的偏振测量相比，燃烧等离子体中的偏振测量在两个方面有所不同：(1) 相对论效应的重要性增加；(2) 法拉第效应与科顿-穆顿效应之间的耦合增强。我们发现，当偏振测量数据（偏振角θ和椭圆角χ）被用作平衡重建的约束条件时，θ和χ的最优权重因子取决于偏振测量视线所穿过的磁面。我们将该方法应用于ITER的方案II（S2）和方案IV（S4）。在通过赤道端口和上端口进行视线测量的情况下，当θ和χ的测量误差分别小于0.5°和3°时，S2和S4中q分布（q-profile）的精度要求（±10%）均得到满足。