论文标题
如何增加FCC-EE的每个MW.H的物理输出？
How to increase the physics output per MW.h for FCC-ee?
论文作者
论文摘要
物理的效率在很大程度上取决于它们的发光度，而高能量$ e^+e^ - $ colliders消耗的大多数能量与总束电流成正比。因此，能源效率主要取决于需要最大化的特定亮度。实现此目的的最有效方法之一是使用螃蟹腰碰撞方案，这意味着较大的Piwinski角（LPA）。 FCC-EE的一个独特特征是Beamstrahlung（相反束场中的辐射）对梁动力学的巨大影响。在低能量下，这表现为能量扩散和束长度的显着增加，并在梁寿命的限制下表现出来。强烈的束与LPA和Beamstrahlung的碰撞也可能导致各种不稳定性限制亮度。在这里，我们讨论在以不同能量优化FCC-EE对撞机的参数时要考虑的主要方面，并解释了基本参数的选择，例如RF电压，IP的晶格功能，束强度等。我们还将注意开放的问题，需要进一步研究并确定该项目下一阶段的一些关键点。
The efficiency of colliders for physics is largely determined by their luminosity, while most of the energy consumed by high-energy $e^+e^-$ colliders is proportional to the total beam current. Thus, the energy efficiency is mainly determined by the specific luminosity that needs to be maximized. One of the most effective ways to achieve this is by using the Crab waist collision scheme, which implies a large Piwinski angle (LPA). A distinctive feature of the FCC-ee is the great influence of beamstrahlung (radiation in the field of an opposite bunch) on beam dynamics. At low energies, this manifests itself in a significant increase in the energy spread and bunch length, at high energies, in a limitation of the beam lifetime. The collision of intense bunches with LPA and beamstrahlung can also lead to various kinds of instabilities limiting the luminosity. Here, we discuss the main aspects to consider when optimizing the parameters of the FCC-ee collider at different energies and explain the choice of basic parameters such as RF voltage, lattice functions at IP, bunch intensity, etc. We will also pay attention to open issues requiring further study and identify some key points for the next phase of this project.
