Active bismuth devices at 4.2 K

✍ Scribed by H.J. Goldsmid

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 233 KB
• Volume: 17
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(77)90151-5

✦ Synopsis

It was found that the lowest temperatures for those amounts of cooled liquid He 4 shown in Table , could be kept without introducing extra power for at leat three hours. The natural heat leak of the system into the cooled He 4 was estimated 0.6 mW.

Peshkov et al 9 had also cooled liquid He 4 in a continuous circulation He 3 cryostat reaching a temperature of 0.5 K in 140 cm 3 liquid He and with a heat leak of 0.7 mW in the He 4 vessel, which was a sealed copper bulb. This new geometry used to cool liquid He 4 in an adsorption He 3 cryostat looks promising and could be improved by diminishing the heat leak in the cooled He 4 . This could be done diminishing the diameter of the tubes T1 and T2 and adding valves to the same to cut off the film effect.

Thanks are given to Professor Dr. B.