Research on Key Technologies for CEPC Alignment

Abstract

The Circular Electron Positron Collider (CEPC), with its unprecedented scale encompassing a circumference of 100 kilometers and stringent alignment accuracy requirements, presents exceptional challenges for accelerator alignment and installation. The primary objective of this study is to develop the key technologies to address these challenges. For 100-kilometer range high-accuracy measurements, this paper proposes to conduct research on the geoid refinement, establishing a high-precision quasi-geoid model and a vertical deflection model covering the entire facility to serve as a global datum for observations reduction. Proposing to develop a visual instrument and a high-accuracy measurement field to facilitate efficient alignment measurements and automated component adjustments. Innovative alignment strategies will be investigated to address the challenges posed by the complex design of the MDI (Interaction Region) and tight alignment accuracy requirement of the accelerator superconducting magnets. The outcomes of this research will provide essential technical support for the high-accuracy alignment and efficient installation of CEPC, offering reusable methodologies and engineering paradigms for future large-scale scientific projects, thereby holding significant scientific value and engineering demonstration significance.