  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 hours, 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.
