Development of double-stage ADR for future space missions

作者：Shinozaki Keisuke^*; Mitsuda Kazuhisa; Yamasaki Noriko Y; Takei Yoh; Masui Kensuke; Asano Kentaro; Ohashi Takaya; Ezoe Yuichiro; Ishisaki Yoshitaka; Fujimoto Ryuichi; Sato Kosuke; Kanao Kenichi; Yoshida Seiji

来源：Cryogenics, 2010, 50(9): 597-602.

DOI：10.1016/j.cryogenics.2010.02.020

• Adiabatic demagnetization
• Cryostat-s
• Space cryogenics

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 similar to 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.

• 出版日期2010-9