Development and Application of Dilution Refrigerator Constructed with Non-metalic Materials

非金属材料稀释制冷机的研制与应用

• 批准号: 07554008
• 负责人: SATOH Takeo
• 金额: $ 8.13万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07554008/
• 关键词: ^4He-D.R; Non-metallic Construction; Spin-polarized ^3He; 非金属希釈冷凍機; 超低温・強磁場; 多重極限用希釈冷凍機; スピン偏極量子液体

The aims of this research are (1) the construction of ^4He-circulating dilution refrigator with non-metallic materials and (2) the realization of spin-polarized liquid ^3He in a stationary state.For the first aim, we succeeded to obtain about 8mK with a plastic mixing chamber and a plastic heat exchanger tube. The construction of a non-metallic de-mixing chamber is found to be very difficult. We should develop a reliable method of sintering of very fine saphire powders.For the second aim, we operated the ^4 He-DR above mentioned in a magnetic field of 6T.We obtained about 12 % polarization at 50mK,which is far from our destination of about 35 %.We will continue the research with much more ^4He-circulating rate.

本研究的目的是：（1）利用非金属材料构建^4He循环稀释制冷机;（2）实现自旋极化液态^3He的稳态制冷。发现非金属分离室的构造非常困难。我们应该开发一种可靠的方法来烧结非常细的蓝宝石粉末。对于第二个目标，我们在6 T的磁场中运行了上述的^4 He-DR。我们在50 mK下获得了大约12%的极化，这与我们的目标35%左右相差甚远。我们将继续研究更大的^4 He循环速率。

项目成果

S.N.Burmistrov and T.Satoh: "Quantum Nuclation in Supersaturated Liquid ^3He-^4He Mixtures" Czechoslovak Journal of Physics. 46. 195-196 (1996)

S.N.Burmistrov 和 T.Satoh：“过饱和液体 ^3He-^4He 混合物中的量子成核”捷克斯洛伐克物理学杂志。

T.Satoh and S.N.Burmistrov: "Quantum Nuclation" Quantum Coherence and Decoherence Elsevier. 93-94 (1996)

T.Satoh 和 S.N.Burmistrov：“量子成核”量子相干和退相干爱思唯尔。

I. Mogi: "Magnetic Field Effects on The Current Oscillation in Anodic Zinc Dissolution" Chem. Phys. Lett.261. 673-674 (1996)

I. Mogi：“磁场对阳极锌溶解中电流振荡的影响”化学。

S.N.Burmistrov: "Experimental and Theoretical Problems of the Quantum Phase-Separation Kinetics of Liquid ^3He-^4He Mixtures" Journal of Low Temperature Physics. 110. 479-484 (1998)

S.N.Burmistrov：“液体 ^3He-^4He 混合物的量子相分离动力学的实验和理论问题”《低温物理学杂志》。

S.N.Burmistrov: "Quantum Nucleation in Supersaturated Liquid ^3He-^4He Mixtures" Czechoslovak Journal of Physics. 46. 195-196 (1996)

S.N.Burmistrov：“过饱和液体 ^3He-^4He 混合物中的量子成核”捷克斯洛伐克物理学杂志。