标题： FAST试验设施NML低温厂的运行经验 显示英文标题

标题： Operational Experience of the NML Cryogenic Plant at the FAST Test Facility

摘要： NML低温工厂冷却两个单独低温恒温的超导射频（SRF）捕获腔和一个具有八个SRF腔的原型ILC低温模块。 该复杂装置在150 MeV下加速电子，用于位于费米实验室加速器科学与技术（FAST）设施中的可积光学测试加速器（IOTA）环。 低温工厂由两个氮气预冷的Tevatron卫星制冷机、两个Mycom 2016C压缩机、一个低温分布系统、一个Frick纯化压缩机、两个活性炭床吸附纯化器以及一个带有Roots增压器的液环真空泵组成。 SRF腔浸没在2.0 K的液氦浴中，用5 K的气态氦屏蔽和液氮冷却的热屏蔽进行屏蔽。 自2019年以来，这个研发加速器综合体已经进行了四次科学运行，平均持续时间为12个月。 本文介绍了每次运行的操作经验、可用性指标、性能数据和常见故障。 显示英文摘要

摘要： The NML cryogenic plant cools two individually cryostated superconducting radio frequency (SRF) capture cavities and one prototype ILC cryomodule with eight SRF cavities. This complex accelerates electrons at 150 MeV for the Integrable Optics Test Accelerator (IOTA) ring, located at the Fermilab Accelerator Science and Technology (FAST) facility. The cryogenic plant is composed of two nitrogen precooled Tevatron satellite refrigerators, two Mycom 2016C compressors, a cryogenic distribution system, a Frick purifier compressor, two charcoal bed adsorber purifiers, and a liquid ring vacuum pump with a roots booster. The SRF cavities are immersed in a 2.0 K liquid helium bath, shielded with a 5 K gaseous helium shield and a liquid nitrogen cooled thermal shield. Since 2019, this R&D accelerator complex has gone through four science runs with an average duration of 12 months. Operational experience for each run, availability metrics, performance data and common outages are presented in this paper.