准对称误差场校正及其在ITER中的应用
Quasi-symmetric error field correction and applications to ITER
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中文总结 AI 辅助
本文提出一种基于新经典扭矩响应的准对称误差场校正方案，可同时最小化共振与非共振效应，在ITER标准等离子体中优于单模共振EFC，接近多模性能，且对等离子体电流场景变化不敏感。
中文摘要 AI 辅助
非轴对称误差场（EFs）的可靠校正是托卡马克运行安全与性能的关键。尽管共振误差场校正（EFC）已得到充分验证，并得益于对三维等离子体响应的深入理解，但共振EFC后残留的场仍是一个未解问题：这些残留场预计以非共振成分为主，但仍可能同时降低约束和稳定性。本文提出了一种系统性的EFC方案，基于自洽扰动平衡计算的新经典扭矩响应，同时最小化共振和非共振EF效应。该方案将用于设计准对称磁扰动的方法扩展到存在实际误差场的情形。将其应用于一系列固有EF场景下的标准ITER目标等离子体，展示了该准对称（QS）EFC方案在控制残留EF方面的优势。QS EFC始终能产生低扭矩解，同时强烈抑制共振响应，在大多数情况下优于单模共振重叠EFC，并接近多模共振EFC的性能。我们还表明，尽管QS EFC解因其高阶性质而预期具有更高的敏感性，但在半和全$I_p$ ITER场景之间，其变化仅在可容忍范围内。
英文摘要
Reliable correction of nonaxisymmetric error fields (EFs) is essential to the safety and performance of tokamak operation. Although resonant error field correction (EFC) is well established, supported by an improved understanding of 3D plasma response, the residual fields left after resonant EFC remain an open question: they are expected to be predominantly nonresonant, yet can still degrade both confinement and stability. Here we introduce a systematic EFC scheme that minimizes resonant and nonresonant EF effects simultaneously, based on neoclassical torque response computed from self-consistent perturbed equilibria. The scheme extends the method developed for designing quasi-symmetric magnetic perturbations to the case where actual error fields are present. Application to standard ITER target plasmas with a range of intrinsic EF scenarios demonstrates the advantages of this quasi-symmetric (QS) EFC scheme for controlling residual EFs. QS EFC consistently yields low-torque solutions while strongly suppressing resonant response, outperforming single-mode resonant overlap EFC in most cases and approaching the performance of multimodal resonant EFC. We also show that the QS EFC solution varies only tolerably between half- and full-$I_p$ ITER scenarios, despite the greater sensitivity expected from its higher-order nature.
发表机构
- ITER Organization, France（国际热核聚变实验堆组织）
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