Development of Cryogenic System for Smiles

• Published in: Advances in Cryogenic Engineering; Volume 49B Vol. 710; pp. 1785 - 1796
• Main Authors: Narasaki, K, Tsunematsu, S, Yajima, S, Okabayashi, A, Inatani, J, Kikuchi, K, Satoh, R, Manabe, T, Seta, M
• Format: Journal Article
• Language: English
• Published: 23.06.2004
• ISBN: 9780735403840; 0735403848
• ISSN: 0094-243X
• DOI: 10.1063/1.1774879

Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) is to be operated aboard the Japanese Experiment Module (JEM) of the International Space Station (ISS) in 2007. SMILES uses two Superconductor-insulator-superconductor (SIS) mixers for submillimeter-wave atmospheric observation, and they are cooled to 4 K levels by a cryogenic system with a two-stage Stirling cooler, a Joule-Thomson (JT) cycle cooler and a cryostat composed of three stages. The cooling capacity is designed as about 20 mW at 4.5 K, 200 mW at 20 K and 1 W at 100 K with the total input power of approximately 140 W. The proto-flight model (PFM) of the cryogenic system has achieved such cooling capacity with significantly less input power, as well as mechanical capability required for launching conditions.