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Title THEORITICAL CRITICAL FIELD IN RF APPILICATION
Type Talk SRF basics
Abstract For these ten years, the high gradient of niobium sc RF cavities seems to saturate around 40 MV/m. The question is in the further technical issue or in the fundamental critical field of niobium material. In this paper the author will try to explain the saturation from the theoretical point of view. Superheating field is reviewed as the fundamental critical field in RF application. In next the author will analyse the temperature variation of the superheating field especially on niobium material. The result is compared with the experimental RF critical field of niobium bulk cavity, which was measured in Cornell University and a good agreement with the prospect ion of vortex nucleation is obtained. The same analysis is extended Nb3Sn or lead cavities, and the consistent result is obtained with the vortex nucleation as the theoretical critical field in RF application.

List of authors...

Principle author first.

Last (Family) Name First Name (Initials only) Affiliation or Organization (abbreviations if possible)
Saito K KEK



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