Design of new helium vessel and tuner for CEPC 650 MHz 2 cell cavity

TL;DR

This paper presents the design of a new helium vessel and tuner for 650 MHz 2-cell cavities used in CEPC, including the development of a test cryomodule to validate the design.

Contribution

It introduces the first structural design of helium vessel and tuner specifically for 650 MHz 2-cell cavities in CEPC.

Findings

Successful design of helium vessel and tuner for 2-cell cavities

Development of a test cryomodule with two 650 MHz cavities

Foundation for full-scale cryomodule implementation

Abstract

CEPC will use 650 MHz cavities for the collider. Each collider cryomodule contains six 650 MHz 2-cell cavities, which is totally new. Therefore, new helium vessel and tuner are designed for the 650 MHz 2-cell cavity. Also, a test cryomodule, which consists of two 650 MHz 2-cell cavities, has begun as the first step to the full scale cryomodule. This paper mainly focuses on the structure design of Helium vessel and tuner for the 2-cell cavity.