| Published Articles | |
| Report number | SRF2019 |
| Title | Thermal Mapping of SRF Cavities by Second Sound Detection With Transition Edge Sensors and Oscillating Superleak Transducers |
| Author(s) | Vandoni, Giovanna (CERN) ; Furci, Hernan (Ecole Polytechnique, Lausanne) ; Koettig, Torsten (CERN) ; Macpherson, Alick (CERN) ; Turaj, Katarzyna (CERN) ; Vega Cid, Lorena (CERN) |
| Publication | 2019 |
| Number of pages | 5 |
| In: | 19th International Conference on RF Superconductivity, Dresden, Germany, 30 Jun - 05 Jul 2019, pp.1184-1188 |
| Subject category | Accelerators and Storage Rings |
| Abstract | The SRF cavity testing facilities at CERN include four vertical cryostat stations in SM18 and a cryostat for small cavities in the Cryolab. A large range of structures are tested, from Nb thin film cavities for HIE-Isolde and LHC, to bulk Nb crab cavities for HiLumi or 704 MHz 5-cell high-gradient cavities. To cope with different shapes and small series tests, thermal mapping diagnostics is deployed by sensing second sound in superfluid helium. A new type of Transition Edge Sensors (TES) has been developed in the last 2 years. These are miniature resistors of thin-film superconducting alloys, micro-produced on insulating wafers. An extensive campaign of optimization of design, fabrication process and composition was accompanied by qualification in a calibration cryostat. Reproducibility, stability, then intensity, distance and angular dependence of the response were assessed and compared to Oscillating Superleak Transducers (OST). The TES were then installed in a vertical cryostat for tests of a prototype crab cavity for HiLumi. TES are now applied to quench localization on high gradient cavities, for which the most recent results will be presented, together with the OST results. |
| Copyright/License | publication: © 2019-2025 The Author(s) (License: CC-BY-3.0) |
Corresponding record in: Inspire
Datensatz erzeugt am 2020-03-10, letzte Änderung am 2022-08-10
