量子噪声目标对爱因斯坦望远镜基础设施设计的影响
Implications of the Quantum Noise Target for the Einstein Telescope Infrastructure Design
摘要：
像爱因斯坦望远镜（ET）这样的复杂仪器的设计是基于从科学探索的复杂案例中获得的目标灵敏度。与此同时，它包含了许多权衡决策，以通过平衡各种子系统的性能与安装和操作成本来最大限度地提高科学价值。本文讨论了长信号循环腔（SRC）对量子噪声性能的影响。我们表明，由于长SRC的ET高频干涉仪的灵敏度降低，提供可能的补偿方案的细节，并建议减少SRC的长度。我们还回顾了过滤腔的长度和光学损耗之间的权衡的细节，并显示了ET低频干涉仪的严格要求。最后，我们提出了一种替代的滤波器腔设计的ET低频干涉仪利用耦合腔，并讨论了在这种情况下的设计的优点。
英文摘要：
The design of a complex instrument such as Einstein Telescope (ET) is based on a target sensitivity derived from an elaborate case for scientific exploration. At the same time it incorporates many trade-off decisions to maximise the scientific value by balancing the performance of the various subsystems against the cost of the installation and operation. In this paper we discuss the impact of a long signal recycling cavity (SRC) on the quantum noise performance. We show the reduction in sensitivity due to a long SRC for an ET high-frequency interferometer, provide details on possible compensations schemes and suggest a reduction of the SRC length. We also recall details of the trade-off between the length and optical losses for filter cavities, and show the strict requirements for an ET low-frequency interferometer. Finally, we present an alternative filter cavity design for an ET low-frequency interferometer making use of a coupled cavity, and discuss the advantages of the design in this context.
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