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11th International Workshop on Thin Films and New Ideas for Pushing the Limits of RF Superconductivity - TFSRF2024

16–20 Sept 2024
Bat. 100, Université Paris-Saclay, France
Europe/Zurich timezone

Session

Nb thin film technology

16 Sept 2024, 15:16
Auditorium Joliot-Curie (Bat. 100, Université Paris-Saclay, France)

Auditorium Joliot-Curie

Bat. 100, Université Paris-Saclay, France

Batiment 100, Orsay Campus

Description

Conventional PVD, energetic condensation from highly ionized plasmas (HiPIMS, Arc Deposition, ECR plasma deposition …), CVD...

Presentation materials

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  1. 55. Status of HIPIMs develpments at CERN
    Mr Kristof Brunner
    16/09/2024, 15:16
    Nb thin film technology

    The SRF cavities made with a niobium coating on a copper substrate (Nb/Cu) offer several advantages over those made with bulk niobium. This is mainly attributed to the excellent thermal properties of copper, enabling operation at higher temperatures and consequently reducing cryogenic costs. The Nb/Cu technology has been employed at CERN since the 1980s, being currently used in the LHC and...

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  2. 56. Ion bombardment energy effect on microstructure and critical current density of Nb/Cu thin films for SRF application.
    Guillaume Jonathan Rosaz (CERN)
    16/09/2024, 15:49
    Nb thin film technology

    "The Future Circular Collider (FCC), foreseen to be built at CERN, relies on the Nb/Cu technology for the 400 MHz RF system. In view of reaching the requested specifications, it is of uttermost importance to push the SRF performance of the Nb thin films to its limits. To do so, it appears critical to understand what are the underlying physical phenomena that drive the Q-slope. Such an effect...

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  3. 60. HiPIMS Nb/Cu cavities at 1.3 GHz
    Anne-Marie Valente-Feliciano
    16/09/2024, 16:32
    Nb thin film technology
  4. 58. HiPIMS Deposition of Nb Coatings with Bias Voltage: Preparation and Characterization at IHEP
    Haichang Duan (IHEP)
    16/09/2024, 17:05
    Nb thin film technology

    The Nb/Cu film superconducting cavities offer several enhancements over traditional bulk niobium RF cavities, including improved mechanical and thermal stability, as well as a reduced sensitivity to DC magnetic fields. Despite these advantages, Nb/Cu film cavities produced via DC magnetron sputtering often exhibit a pronounced Q-slope issue, potentially due to the low-energy deposition...

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  5. 59. Addressing the Medium-Field Q-Slope Challenge in Nb Thin Film Cavities
    Bektur Abdisatarov (FERMILAB)
    16/09/2024, 17:29
    Nb thin film technology

    In this study, we addressed the persistent medium-field Q-slope issue in Nb thin film cavities, which, despite their high Q at low RF fields, exhibit a significant Q-slope at medium RF fields compared to bulk Nb cavities. Traditional heat treatments, effective in reducing surface resistance and mitigating the Q-slope in bulk Nb SRF cavities, are challenging for Nb thin film cavities. We...

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