CEPC has two MDI locations. It is very complex in the mechanics design owing to extremely high precision and stability requirement as well as the limited space. This paper will describe two most complex mechanics issues and the progress. For the vacuum connection between detector and accelerator, two schemes including RVC and inflatable seal have been designed in detail. For the cryostat support system, the preliminary structure design and FEA have been done, and the alignment method is under study.

中文翻译：

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TDR中CEPC MDI的主要力学问题

CEPC 有两个 MDI 地点。由于极高的精度和稳定性要求以及有限的空间，它的机械设计非常复杂。本文将描述两个最复杂的力学问题及其进展。针对探测器与加速器之间的真空连接，详细设计了RVC和充气密封两种方案。对于低温恒温器支撑系统，已经进行了初步的结构设计和有限元分析，对准方法正在研究中。