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SRF cavities

Cavity design

La Division Accélérateurs a une compétence forte en conception, réalisation et tests de cavités supraconductrices accélératrices. Un des points clé de cette activité est le développement et l’optimisation de nouveaux types de résonateurs RF adaptés à la supraconductivité. La DA est notamment active dans la R&D sur : les cavités bas bêta de type "Quart d’ondes", comme celles utilisées pour SPIRAL-2, les cavités bas bêta de type "Spoke", une des spécialités du laboratoire (cf. photo ci-contre), (...)

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Thin SRF films

SRF resonators made of high purity bulk niobium are increasingly used in linear particle accelerators. In order to push further on accelerating gradients, a major R&D effort is carried out to increase the performances of superconducting materials. New materials and new processes must be investigated to replace bulk niobium for which theoretical limits are almost reached (53 MV/m @ Bc=200 mT for a single cell cavity ILC-shape). For this purpose, a TE011 test cavity resonating at 3.87 (...)

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Surface polishing

Mechanical polishing techniques have been now used for decades for e.g. optical devices, achieving unsurpassed surface quality with surface roughness in the nano-metric scale. The aim of this R&D activity is to study and build an innovative set-up to improve, quality-wise and safety-wise, the process for surface polishing of SRF cavities. Indeed the standard current surface treatments typically used in the community are either a Buffered Chemical Polishing (BCP) or an Electro-Polishing (...)

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