SAFARI engineering model 50 mK cooler

• Published in: Cryogenics (Guildford) Vol. 64; pp. 213 - 219
• Main Authors: Duband, L., Duval, J.M., Luchier, N.
• Format: Journal Article
• Language: English
• Published: Elsevier 01-11-2014
• Subjects: Adiabatic flow; Computer Science; Consortia; Coolers; Demagnetization; Engineering Sciences; Fluid Dynamics; Fluids mechanics; Infrared instruments; Mechanics; Modeling and Simulation; Physics; Random vibration; Sorption; Static loads; Thermics
• ISSN: 0011-2275
• DOI: 10.1016/j.cryogenics.2014.02.008

SAFARI is an infrared instrument developed by a European based consortium to be flown in SPICA, a Japanese led mission. The SAFARI detectors are transition edge sensors (TES) and require temperatures down to 50 mK for their operation. For that purpose we have developed a hybrid architecture based on the combination of a 300 mK sorption stage and a small adiabatic demagnetization stage. An engineering model has been designed to provide net heat lifts of 0.4 and 14 mu W respectively at 50 and 300 mK, with an overall cycle duration of 48 h and a duty cycle objective of over 75%. The cooler is self-contained, fits in a volume of 156 x 312 x 182 mm and is expected to weigh 5.1 kg. It has been designed to withstand static loads of 120 g and a random vibration level of 21 g RMS.