Influence of changes in atmospheric pressure on evaporation rates of low-loss helium cryostats

✍ Scribed by P. Hanzelka; V. Musilová

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 369 KB
• Volume: 35
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(95)93997-e

✦ Synopsis

Experimental equipment for pressure control and evaporation rate measurement of a low-loss helium cryostat is described. The dependence of the helium gas outflow on the linearly varying pressure is presented for an NMR cryostat. The variations in measured helium evaporation rate were significantly high during experiments simulating usual atmospheric pressure changes. The measured quantities are compared to those evaluated by applying a simple theoretical model based on the assumption that the liquid and gas in the helium vessel are in thermodynamic equilibrium.