ELECTRIC FEEDTHROUGH STRUCTURE FOR SUPERCONDUCTOR ELEMENT

摘要

The invention concerns an electric feedthrough structure (10) of the type comprising: - a central conductor (19) where one (26) of its two ends is meant to be connected to a superconductor element situated in a cryogenic temperature enclosure (11), and the other end (25) to an object at room temperature; - an electrically insulating sheath (20) surrounding the conductor on roughly the entire length thereof; - a metallic tube (24) surrounding the conductor on roughly the entire length thereof and interposed between the insulating sheath (20) and the conductor (19), the tube being mechanically fixed to the conductor in proximity to one of the ends (25, 26) of the conductor, known as the first end, and not being mechanically fixed to the conductor in proximity to the other end of the conductor, known as the second end; - and a space between said conductor and said tube containing a gas. According to the invention, the tube is in electrical contact with said second end of the conductor.