THXA05
CERN, Geneva, Switzerland
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THXA05 |
Thermal Mapping for SRF with Transition Edge Sensors | |
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| Amongst the second sound detectors, Oscillating Superleak Transducers (OST) have been widely used in the field of thermal mapping for SRF cavities. Less commonly used, Transition Edge Sensors (TES) present the advantage over the OSTs of providing a better spatial resolution and an intensity response linear with the heat flux from the hot spot. The TES is a thin-film thermal sensor, whose electric resistance varies steeply only within the superconducting-to-normal transition. Range is limited to the transition edge (around 200 mK), which can be tuned in temperature by a bias current. The temperature variations associated with second-sound in superfluid helium are then visible as proportional changes of the voltage drop across the film strip. Dedicated TES for operation in superfluid helium have been developed in collaboration with CMi-EPFL Lausanne and characterized at CERN. The paper will illustrate this recent development, the application of TES to quench detection from bulk Nb cavities in comparison with OSTs and their use to construct a contactless 3D thermal mapping array operating in superfluid helium. | ||
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Slides THXA05 [9.345 MB] | |
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