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Session 1 : Fundamental of SRF

Session 1 : Fundamental of SRF. Is the superheating field a relevant model? Or Kenji’s one? Do we actually observe RF superconductivity at field higher than Bc (Bc1, Bc2 or thermodynamic Bc ?) Are there some specific RF properties we are not aware of?

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Session 1 : Fundamental of SRF

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  1. Session 1 : Fundamental of SRF • Is the superheating field a relevant model? Or Kenji’s one? • Do we actually observe RF superconductivity at field higher than Bc (Bc1, Bc2 or thermodynamic Bc ?) • Are there some specific RF properties we are not aware of? • What can we expect from other material (measuring basic SC parameters to implement models) SRF materials workshop

  2. Session 2 : Material properties and characterization Surface Studies • What are the limits of what we can observe compare to what we want to know? • How can we overcome the variability of the actual Nb Surface (How representative of the whole surface are the measurements?) • Are there better fitted techniques we don’t know yet? • How can we correlate surface composition/structure with SRF behavior? SRF materials workshop

  3. Session 2 : Material properties and characterization RF / Superconducting properties • Coupling with surface analysis! • Is the comparison Samples/Cavities relevant • What is the link between DC/RF properties, between low field/high field properties • Are there other parameters “easy” to measure that could give us better prediction of the cavity behavior? • Thermal transfer: influence of annealing, grain boundaries…. SRF materials workshop

  4. Session 3: New materials for the future • Can we prepare “defect free” superconductors (with at least the same material quality as the high RRR Nb we are presently using). • What can we expect from other material (measuring basic SC parameters to implement models) (cf session 1) SRF materials workshop

  5. Session 4: Innovative processing methods • How can we overcome the variability of the present surface preparation processes • What do we need to address? Surface removal (what thickness, why), particle contamination, surface modification regarding secondary emission, field emission… Are all these issues compatible between themselves? • Do we need complementary or alternative techniques? SRF materials workshop

  6. Session 5: Niobium production • What knowledge do we need to get reproducible production of the adequate material • How can we practically get reproducible production of the adequate material • Are there specific textures/ orientations with more favorable behavior (forming, magnetic transition field, work function….), how can we optimize it. • What do we still need to know? (e.g. recrystallization behavior @ welding, cold mechanical resistance of welded parts…) SRF materials workshop

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