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Coaxial Radio Frequency Feedthrough

IP.com Disclosure Number: IPCOM000074763D
Original Publication Date: 1971-Jun-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Renken, HH: AUTHOR

Abstract

This apparatus of simplified construction feeds RF electrical pulses and cooling fluid through a wall 10 of a vacuum chamber, without allowing coupling of the RF pulses to the vacuum chamber. It includes first and second tubes 11 and 12 of a conducting metal, such as copper, which are adapted to conduct RF electrical pulses on their surface and to carry the cooling fluid in their interiors. A third tube 14, also of a conducting metal, is coaxially disposed about a portion of the second tube 12 which passes through wall 10. Metal to ceramic insulator 16 separates the second tube 12 from third tube 14 and supports tube 12. Third tube 14 is also insulated from wall 10. Third tube 14 and first tube 11 are brazed together.

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Coaxial Radio Frequency Feedthrough

This apparatus of simplified construction feeds RF electrical pulses and cooling fluid through a wall 10 of a vacuum chamber, without allowing coupling of the RF pulses to the vacuum chamber. It includes first and second tubes 11 and 12 of a conducting metal, such as copper, which are adapted to conduct RF electrical pulses on their surface and to carry the cooling fluid in their interiors. A third tube 14, also of a conducting metal, is coaxially disposed about a portion of the second tube 12 which passes through wall 10. Metal to ceramic insulator 16 separates the second tube 12 from third tube 14 and supports tube 12. Third tube 14 is also insulated from wall 10. Third tube 14 and first tube 11 are brazed together.

RF pulses conducted on the surface of first tube 11 reach third tube 14, then pass through wall 10 on the surface of tube 14. They then continue to be conducted on the surface of first tube 11 after passing through wall 10. Coupling of the pulses to wall 10 is prevented. The cooling fluid passes through first tube 11 and second tube 12.

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