First results on fast baking

High gradient performances of bulk niobium cavities go through a low-temperature baking during one or two days, the temperature parameter is adjusted in a narrow tuning range around 110 or 120 °C. With such treatment, the intrinsic quality factor Q 0 is improved at high fields. Assuming the oxygen d...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2006-07, Vol.441 (1), p.66-69
Main Authors: Visentin, B., Gasser, Y., Charrier, J.P.
Format: Article
Language:English
Subjects:
Applied sciences
Baking
Electrical engineering. Electrical power engineering
Exact sciences and technology
High gradients
Niobium
Oxygen diffusion
Power electronics, power supplies
Q-slope
Superconducting RF cavities
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Summary:High gradient performances of bulk niobium cavities go through a low-temperature baking during one or two days, the temperature parameter is adjusted in a narrow tuning range around 110 or 120 °C. With such treatment, the intrinsic quality factor Q 0 is improved at high fields. Assuming the oxygen diffusion is involved in this phenomenon, we have developed the “fast baking” (145 °C/3 h) as an alternative method. Similar results have been achieved with this method compared to standard baking. Consequently, for the first time, a link between oxygen diffusion and high field Q-slope has been demonstrated. Furthermore, this method open the way to a simpler and better baking procedure for the large-scale cavity production due to: • time reduction and • possibility to combine baking and drying during cavity preparation.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2006.03.045