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

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