GroundBIRD Experiment: Detecting CMB Polarization Power in a Large Angular Scale from the Ground

Oguri, S.; Choi, Jihoon; Hazumi, M.; Kawai, M.; Tajima, O.; Won, E.; Yoshida, Mitsuhiro

doi:10.1007/s10909-014-1138-0

Cited by 7 publications

(3 citation statements)

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“…Making a low temperature condition on a rotating platform is a key technology in a number of science experiments, e.g., tests of Lorentz invariance 1,2 , searches for axions 3 , and radio telescopes for astronomy and cosmology 4 . In a previous publication 5 , we described a cryocooling system on a rotating table; the lowest temperature achieved was 7 K using a two-stage Gifford-McMahon cryocooler.…”

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“…In this paper, we report a lowering of the lowest temperature to 0.23 K. This advancement allows superconducting devices to be used in the system. In particular, attaining temperatures below 0.3 K is an important milestone in regard to precise measurements of the cosmic microwave background radiation 4 .…”

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confidence: 99%

“…Using the cryopump, each stage reaches its desired cold temperature by vaporization cooling. As the three stages contain sequentially 4 He, 3 He, and 3 He, we labeled the coldest place in each stage (and each cryopump) "He4" head (pump), "He3I" head (pump), and "He3U" head (pump), respectively. The stages are thermally connected in series; the temperatures attained decrease in the order He4 head, He3I head, and He3U head.…”

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Note: Sub-Kelvin refrigeration with dry-coolers on a rotating system

Oguri

Ishitsuka

Choi

et al. 2014

Review of Scientific Instruments

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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.

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