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Charrier, J.-P.

Paper Title Page
MOPCH141 Fast Argon-Baking Process for Mass Production of Niobium Superconducting RF Cavities 381
 
  • B. Visentin, J.-P. Charrier, Y. Gasser, S. Regnaud
    CEA, Gif-sur-Yvette
 
  Baking is a necessary stage to reach high gradients with niobium superconducting cavities. In the standard process, so called "in-situ UHV baking", Nb cavity is baked at 110°C, during 2 days. During this treatment the inner part of the cavity is pumped out under Ultra High Vacuum conditions. In order to save time, "fast UHV baking" at 145 °C during 3 hours, under UHV pumping, has been successfully demonstrated* with similar improvements for cavity performances compare to the standard treatment. With the same simplification concern, we report here about an alternative method to avoid restrictive UHV requirements. Experiments have been carried out to perform "fast baking" in oxygen-free atmosphere, because bad performances have been observed with "fast baking" in air. These degradations are closely connected with a strong oxygen penetration in bulk analysed by Secondary Ion Mass Spectroscopyon on Nb samples .

*Proceedings of SRF Workshop – Ithaca (July 2005) – TuP05.