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北京同步辐射装置新建设的1B3前端区位于储存环1区隧道内,下游建设两条光束线1B3A光刻束线和1B3B测试束线。前端区是同步辐射实验装置的一部分,上接光源下连光束线,起到承上启下的作用。由于空气对同步辐射有着强烈的吸收效应,因此为了保证实验能够获得足够的光通量,在包括前端区的整个光束线内部都要维持超高真空环境。前端区的真空设计对同步辐射实验装置有着重要意义。前端区真空设计工作主要包含真空设备布局和真空计算两部分。1B3前端区经过安装调试后,静态真空度达到4.4×10-8Pa,在北京同步辐射装置专用模式和兼用模式下的动态真空度高于6.7×10-7Pa。从测试结果中可以看出,1B3前端区真空度达到真空设计指标,满足束线使用要求。
The newly constructed 1B3 front-end of the Beijing Synchrotron Radiation Facility is located in the tunnel of Storage Zone 1 Zone 1, with two 1B3A and 1B3B test beam lines for the two beamlines downstream. The front-end zone is part of a synchrotron radiation experimental setup, with a beamline connected to the light source to function as an intermediary. Since air has a strong absorption effect on synchrotron radiation, an ultrahigh vacuum is maintained throughout the entire beamline, including the tip region, in order to ensure that experiments can obtain sufficient flux. The vacuum design of the front zone is of great significance to the experimental device of synchrotron radiation. Front-end vacuum design work mainly includes vacuum equipment layout and vacuum calculation of two parts. 1B3 front-end area after installation and commissioning, the static vacuum reached 4.4 × 10-8Pa, Beijing Synchrotron radiation mode and dual mode dynamic vacuum greater than 6.7 × 10-7Pa. It can be seen from the test results, 1B3 front end of the vacuum degree of vacuum design specifications to meet the beam line requirements.