Superconducting coils cooled by a ‘Cold Finger’

✍ Scribed by P Levinson; A Laberrigue; O Testard

• Book ID: 103052025
• Publisher: Elsevier Science
• Year: 1965
• Tongue: English
• Weight: 218 KB
• Volume: 5
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(65)90088-3

✦ Synopsis

A N E w type of cryostat has been constructed in our laboratory under the name of 'Cold Finger'. Two assemblies are at present operating on our premises at the Coll/~ge de France.

The first one is incorporated into a vertical electron diffractor and is used to cool down a superconducting sample submitted to a magnetic field generated by a superconducting coil. Both coil and sample are in vacuum.

With the second assembly, it is possible to test different types of superconducting magnetic objective lenses for electron microscopes.

As no space was available to place an adequate liquid helium vessel, it was decided to design a continuous liquid feed flow. Although this note deals primarily with cryogenic problems, two different ways of moving the cold finger will also be described.