title: Note: Sub-Kelvin refrigeration with dry-coolers on a rotating system.
abstract: We developed a cryogenic system on a rotating table that achieves sub-Kelvin conditions. The cryogenic system consists of a helium sorption cooler and a pulse tube cooler in a cryostat mounted on a rotating table. Two rotary-joint connectors for electricity and helium gas circulation enable the coolers to be operated and maintained with ease. We performed cool-down tests under a condition of continuous rotation at 20 rpm. We obtained a temperature of 0.23 K with a holding time of more than 24 h, thus complying with catalog specifications. We monitored the system's performance for four weeks; two weeks with and without rotation. A few-percent difference in conditions was observed between these two states. Most applications can tolerate such a slight difference. The technology developed is useful for various scientific applications requiring sub-Kelvin conditions on rotating platforms.
authors.affiliation: Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Oho, Tsukuba, Ibaraki 305-0801, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Oguri
authors.affiliation: Department of Particle and Nuclear Physics, School of High Energy Accelerator Science, The Graduate University for Advanced Studies (SOKENDAI), Shonan Village, Hayama, Kanagawa 240-0193, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Ishitsuka
authors.affiliation: Department of Physics, Korea University, Anam-dong Seongbuk-gu, Seoul 136-713, South Korea.
authors.forename: J
authors.initials: J
authors.lastname: Choi
authors.affiliation: Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Oho, Tsukuba, Ibaraki 305-0801, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kawai
authors.affiliation: Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Oho, Tsukuba, Ibaraki 305-0801, Japan.
authors.forename: O
authors.initials: O
authors.lastname: Tajima