The CEPC includes a main ring and an injector. The injector consists of a booster and a linac. In order to meet the requirements of the booster, the baseline design of the linac is a 10 GeV electron and positron linac. Two alternative linac designs have also been introduced in this paper. For the linac baseline design, one-bunch-per-pulse is adopted. A 1.1 GeV damping ring is used to reduce the transverse emittance of positron beam. The main RF system of the linac adopts normal conducting S-band structure. Some key technologies of linac are development. The S-band structure and pulse compressor have been researched and studied. In the damping ring, two cavities used to provide 2 MV voltage. The preliminary cavity design has finished.

中文翻译：

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CEPC喷射器直线加速器的研发

CEPC 包括一个主环和一个喷射器。喷油器由一个增压器和一个直线加速器组成。为了满足助推器的要求，直线加速器的基线设计为 10 GeV 电子和正电子直线加速器。本文还介绍了两种可供选择的直线加速器设计。对于直线加速器基线设计，采用每脉冲一束。1.1 GeV 阻尼环用于降低正电子束的横向发射率。直线加速器的主射频系统采用常导S波段结构。直线加速器的一些关键技术正在开发中。对S波段结构和脉冲压缩器进行了研究和研究。在阻尼环中，两个空腔用于提供 2 MV 电压。初步腔体设计已经完成。