Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 193, Issue 5-6, Pages 805-812Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-018-2024-y
Keywords
Astronomical instrumentation; Cryogenics; Dilution refrigeration; Sorption cooling; Large Millimeter Telescope
Categories
Funding
- Research Councils UK (RCUK)
- Consejo Nacional de Ciencia y Tecnologia (CONACYT) under the Newton Fund [ST/P002803/1]
- Chase Research Cryogenics Ltd.
- STFC [ST/P002803/1] Funding Source: UKRI
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The MUSCAT instrument is a large-format camera planned for installation on the Large Millimeter Telescope in 2018. MUSCAT requires continuous cooling of several large-volume stages to sub-Kelvin temperatures, with the focal plane cooled to 100 mK. Through the use of continuous sorption coolers and a miniature dilution refrigerator, the MUSCAT project can fulfil its cryogenic requirements at a fraction of the cost and space required for conventional dilution systems. Our design is a helium-light system, using a total of only 9L of helium-3 across several continuous cooling systems, cooling from 4K to 100 mK. Here we describe the operation of both the continuous sorption and the miniature dilution refrigerator systems used in this system, along with the overall thermal design and budgeting of MUSCAT. MUSCAT will represent the first deployment of these new technologies in a science-grade instrument and will prove the concept as a viable option for future large-scale experiments such as CMB-S4.
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