AI 中文总结
提出重力对齐的垂直正负电子直线对撞机概念，以打破传统水平希格斯工厂的成本和规模限制。采用高梯度、高效的常规导电加速结构及双束功率传输方案，复用现有加速器设施，讨论了其优缺点及可行性，旨在推动相关研究与创新。
AI 中文摘要
提出了一种重力对齐的垂直正负电子直线对撞机概念，以打破传统水平希格斯工厂面临的成本和规模僵局。加速轴沿单个深竖井内的局部引力场定向。正电子从地表向下注入，电子从底部向上加速，两束粒子束在地下深处的相互作用点相遇。该概念以希格斯工厂能量范围（250-500 GeV）为目标，采用低温下运行的高梯度、高效、常规导电加速结构以及双束功率传输方案。它可设计为复用日本筑波市高能加速器研究机构（KEK）的现有KEK/超级KEKB加速器设施。讨论了垂直方向的优势，如占地面积小、重力负载的固有方位对称性、碰撞点的深度隔振、重力辅助低温技术、自然垂直对齐参考、宇宙安静的深相互作用点、现场电力自给自足的机会以及社会/工业评估中的独特机会，以及主要缺点和挑战，包括所需的加速梯度和千米深竖井的建设。仅使用公开信息，认为在地质条件有利的地点挖掘深度约3公里的竖井是可行的。本文旨在激发技术创新、可行性研究以及通过垂直碰撞探索超出标准模型搜索的可能新途径。
英文摘要
A gravity-aligned vertical electron-positron linear collider is proposed as a concept to break the cost-and-scale impasse that confronts conventional horizontal Higgs factories. The accelerating axis is oriented along the local gravitational field inside a single deep vertical shaft. Positrons are injected downward from the surface while electrons are accelerated upward from the bottom, the two beams meeting at an interaction point located deep underground. Targeting a staged center-of-mass energy in the Higgs factory range (250-500 GeV), this concept assumes high-gradient, high-efficiency, normal-conducting accelerating structures operated at cryogenic temperature together with a two-beam power-delivery scheme. It can be designed to reuse the existing KEK/SuperKEKB accelerator complex at the KEK Tsukuba Campus. We discuss the advantages of the vertical orientation, namely a small surface footprint, intrinsic azimuthal symmetry of the gravity load, deep vibration isolation of the collision point, gravity-assisted cryogenics, a natural vertical alignment reference, a cosmically quiet deep interaction point, an opportunity for on-site electricity self-sufficiency, and a unique opportunity in social/industrial evaluation, as well as the principal disadvantages and challenges, including the required accelerating gradient and the construction of a kilometers-deep shaft. Using only publicly available information, we argue that excavating a shaft with a depth of ~3 km is feasible at a geologically favorable site. This paper is deliberately concept-level and is intended to motivate technological innovation, feasibility studies, and the exploration of possible new channels for Beyond-Standard-Model searches through vertical collisions.
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