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12th International Workshop on Thin Films and New Ideas for Pushing the Limits of RF Superconductivity

21–25 Sept 2026
Crowne Plaza Chester, Chester, United Kingdom
Europe/London timezone

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Session

Functional layers for SRF & Beyond

24 Sept 2026, 09:00
Prince of Wales Suite (Crowne Plaza Chester, Chester, United Kingdom)

Prince of Wales Suite

Crowne Plaza Chester, Chester, United Kingdom

Conveners

Functional layers for SRF & Beyond

  • Yasmine Kalboussi (CEA)

Presentation materials

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  1. 38. Atomic Layer Deposition of Functional Oxide Interfaces for Mitigation of Two-Level-System Losses in Niobium SRF Cavities
    Laura Grassellino (Fermilab)
    24/09/2026, 09:00
    Beyond Nb & Nb3Sn: Alternate materials, multilayer SIS structures and functional layers

    Niobium-based superconducting radio-frequency (SRF) cavities have demonstrated exceptionally high quality factors, making them an attractive platform for investigating fundamental loss mechanisms in superconducting quantum systems. To further reduce surface-related dissipation, we investigate a surface-engineering approach based on thermal atomic layer deposition (ALD) of functional oxide thin...

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  2. 25. Surface passivation of cavities for reduction of two-level systems at low gradients
    Rakshith Venugopal (Deutsches Elektronen-Synchrotron DESY)
    24/09/2026, 09:30
    Beyond Nb & Nb3Sn: Alternate materials, multilayer SIS structures and functional layers

    The native oxides of niobium cause surface losses during cavity operation arising from two-level systems/defects (TLS). These losses dominate the quality factor at low accelerating gradients (Eacc < 0.1 MV/m). In particular, the amorphous Nb2O5 is identified as a prominent host for the TLS. Nb2O5 dissociates when the material is baked above 200 °C for several hours in vacuum (the so-called...

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  3. 15. Tuning the secondary electron yield with nanoheterostructures
    Thomas Proslier (CEA)
    24/09/2026, 10:00
    Beyond Nb & Nb3Sn: Alternate materials, multilayer SIS structures and functional layers

    Secondary electron emission (SEE), arising from the interaction of energetic electrons with material surfaces, can induce deleterious effects in vacuum radio-frequency (RF) systems, notably multipacting, thereby degrading performance and threatening device integrity. Despite extensive efforts, effective and widely adopted mitigation strategies remain limited. Here, we report an approach to...

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