Development of double-stage ADR for future space missions

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• 作者：Keisuke Shinozaki ; Kazuhisa Mitsuda ; Noriko Y. Yamasaki ; Yoh Takei ; Kensuke Masui ; Kentaro Asano ; Takaya Ohashi ; Yuichiro Ezoe ; Yoshitaka Ishisaki ; Ryuichi Fujimoto ; Kosuke Sato ; Kenichi Kanao ; Seiji
• 关键词：E. Adiabatic demagnetization ; F. Cryostat-s ; F. Space cryogenics
• 刊名：Cryogenics
• 出版年：2010
• 出版时间：September 2010
• 年：2010
• 卷：50
• 期：9
• 页码：597-602
• 全文大小：619 K

文摘

We report a development of a portable dewar with a double-stage ADR in it, and its cooling test results. The purpose of this system is to establish a cooling cycle of double-stage adiabatic demagnetization from 4.2 K to 50 mK, which is strongly desired for future space science missions. In our test dewar, two units of ADR are installed in parallel at the bottom of a liquid He tank. We used 600 g of GGG (Gadolinium Gallium Garnet) for the higher temperature stage (4 Tesla) and 90 g of CPA (Chromic Potassium Alum) for the lower temperature stage (3 Tesla). A passive gas-gap heat switch (PGGHS) is used between these two stages, while a mechanical heat switch between the He tank and the GGG stage. Using this system, 50 mK was achieved, and various kinds of cooling cycles with different operating temperatures and different sequences of magnetization were tested. We also evaluated the performance of the PGGHS, and interference of the magnetic field with each other during a stable temperature control.