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SRF2003 Show Abstract

Title Q-slope at High Gradients: Review about Experiments and Explanations
Type Talk high gradient
Abstract The quality factor of niobium superconducting cavities shows a strong degradation (Q-slope) for accelerating fields above 20 MV/m. These non quadratic losses are not linked to a field emission because no electrons or X-rays are detected.  A simple in-situ bake-out around 120 C induces modifications of the surface superconducting parameters and the Q-slope removal. The Q-slope improvement seems more easy to achieve if the cavity is electro-polished (EP) rather than etched by using a standard buffered chemical polishing (BCP).  On the basis of these experimental observations, different models have been developed and many experiments carried out to explain the Q-slope origin. We will try to make a overall analysis of theories and experiments to make allowances and to reduce the field of research.

List of authors...

Principle author first.

Last (Family) Name First Name (Initials only) Affiliation or Organization (abbreviations if possible)
Visentin B. CEA Saclay

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