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arXiv 2501.18293physics.plasm-ph
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非共振仿星器偏滤器的拓扑学

The topology of non-resonant stellarator divertors

Robert Davies, Christopher B. Smiet, Alkesh Punjabi, Allen Boozer, Sophia A. Henneberg

AI总结:

应用拓扑方法计算绕数,揭示非共振偏滤器哈密顿系统及QUASR数据库中仿星器通过未配对X点引导轨迹偏离约束区域实现磁场偏移的机制,为未来反应堆设计提供新思路。

摘要:

我们应用拓扑方法以更好地理解仿星器边缘的磁场如何从约束区域偏移出去。我们的主要方法是计算闭合回路的绕数,这提供了有界区域内不动点的数量和性质的信息。我们首先将此方法应用于非共振偏滤器(NRD)哈密顿系统,并对系统的偏移给出了一个简单的解释:轨迹被“未配对”的 X 点引导离开约束区域,即这些 X 点没有对应的 O 点,因此不类似于岛链。我们展示了在类似的轴对称哈密顿系统中如何发生类似的现象。其次,我们在 QUASR 数据库中发现了通过未配对的 X 点偏移磁场的经典优化的仿星器实例。我们展示并讨论了三个示例,每个示例都包含可能对仿星器偏滤器有益的新颖现象。这些发现拓宽了在现实仿星器中磁场如何被偏移的视野,并且可能对未来的实验和仿星器反应堆设计具有吸引力。

英文摘要:

We apply topological methods to better understand how the magnetic field in the stellarator edge can be diverted away from the confined region. Our primary method is calculating the winding numbers of closed contours, which gives information on the number and nature of fixed points within a bounded region. We first apply this to the non-resonant divertor (NRD) Hamiltonian system, and present a simple explanation for the system's diversion: trajectories are guided away from the confined region by X-points which are "unpaired" i.e. do not have corresponding O-points and therefore do not resemble an island chain. We show how similar phenomena can occur in a similar, axisymmetric Hamiltonian system. Secondly, we find examples of neoclassically optimised stellarators in the QUASR database which divert the magnetic field via unpaired X-points. We present and discuss three examples, each containing novel phenomena which might be desirable for stellarator divertors. These findings broaden the horizons of how magnetic fields can be diverted in realistic stellarators, and may be attractive for future experiments and stellarator reactor design.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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