FCC-ee研究中首个超导最终聚焦四极磁体原型
The first superconducting final focus quadrupole prototype of the FCC-ee study
AI总结：
本文研制了FCC-ee最终聚焦区用NbTi超导CCT四极磁体原型，通过优化导体布局抑制边缘效应，实验表明其无锻炼行为且高阶多极场低于1×10⁻⁴单位，验证了该方案在紧凑高场质量应用中的可行性。
摘要：
针对FCC-ee研究的最终聚焦区域，研制了一台采用NbTi超导体的单孔径Canted-Cosine-Theta（CCT）四极磁体。导体布局经过优化，以减轻磁体两侧中一侧的边缘效应，这种边缘效应通常会导致不希望的高阶多极场。文中给出了原型的实验结果，包括石蜡浸渍和低温测量。该磁体未表现出锻炼行为，在首次升流过程中即超过了标称电流。场质量优异，高阶多极场低于$1\ imes 10^{-4}$单位，与模拟结果和常温测试一致。这些发现证实了超导CCT磁体在为要求严格场质量的应用提供紧凑解决方案方面的潜力。
英文摘要：
A single aperture Canted-Cosine-Theta (CCT) quadrupole magnet, made of NbTi superconductors, has been developed for the final focus region of the FCC-ee study. The conductor layout is optimised to mitigate edge effects on one of the two sides of the magnet that typically lead to undesired higher-order multipoles. Experimental results of a prototype, including paraffin wax impregnation and cryogenic temperature measurements, are presented. The magnet exhibits no training behaviour, surpassing the nominal current during the initial ramp. Field quality is excellent, with higher-order multipoles below $1\times 10^{-4}$ units, consistent with simulations and room temperature tests. These findings confirm the potential of superconducting CCT magnets to offer compact solutions for applications demanding stringent field quality.
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