Pumping liquid helium

✍ Scribed by A.H. Kalantar

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 191 KB
• Volume: 20
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(80)90098-3

✦ Synopsis

magnet power supply. The linear regulated power supplies normally used in laboratories for this purpose have a peak power dissipation of 100-500 W. Fortunately, this power consumption could be dramatically reduced by redesigning the magnet and power supply. By using more turns of thinner wire, the current required to produce 3 T could be reduced from ~40 A to ~ 1 A. If such a magnet were controlled by a switching power supply, the peak power dissipation could be reduced to ~2 W. With this type of magnet and power supply and with a microprocessor-based automatic control system of the type described here, adiabatic demagnetization will be a viable cooling method for use in space.