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Oscillating superleak transducers and temperature mapping diagnostice for high gradient cavities at CERN

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Cavity performance can be limited by a transition from superconducting to normal conducting state due to heating of a local hot spot, called quenching. Therefore systems used to locate quench area(s) are essential for achieving higher gradients. Nowadays mainstream cavity diagnostics systems include the temperature mapping system and second sound triangulation using oscillating superleak transducers (OSTs) in superfluid helium. This seminar offers an overview on cavity diagnostics, challenges and development in these two systems for the SPL (Superconducting Proton Linac) 704 MHz cavities at CERN

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