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10th International Workshop on Thin Films and New Ideas for Pushing the Limits of RF Superconductivity

Sep 19 – 23, 2022
Jefferson Lab
US/Eastern timezone

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Session

Theoretical approach for SRF Thin Films & Structures

Mo3
Sep 19, 2022, 10:50 AM
Jefferson Lab

Jefferson Lab

Conveners

Theoretical approach for SRF Thin Films & Structures

  • Uttar Pudasaini (Jefferson Lab)

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  1. 5. Model for heat dissipation by constrictions of electric field in granular thin film Niobium
    Claire Antoine (CEA)
    9/19/22, 10:50 AM
    Theoretical approach for SRF Thin Films & Structures

    We propose an alternative model to explain power dissipation leading to the formation of hot spots in the inner walls of niobium porous thin film superconducting rf cavities. The physical mechanism that we explore is related to the constriction of surface electrical current flow at grain interface boundaries. These constrictions create an additional electrical contact resistance which induces...

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  2. 38. Modelisation of Oxygen profile tailoring in bulk and thin film Nb
    Eric Lechner (Jefferson Lab)
    9/19/22, 11:20 AM
  3. 6. Nonlinear Meissner effect in Nb3Sn thin film coplanar resonators
    Alexander Gurevich (ODU)
    9/19/22, 11:40 AM

    We investigated the nonlinear Meissner effect (NLME) in Nb3Sn thin film coplanar resonators by measuring the resonance frequency as a function of a dc magnetic field applied parallel to the film surface at different temperatures. We used low rf power probing in films thinner than the London penetration depth λ(B) to significantly increase the field onset of vortex penetration and measure the...

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  4. 40. Thermal-conductivity-related New Strategy for Breaking the Eacc Limit
    Didi Luo (Institute of Modern Physics, Chinese Academy of Sciences (Remote))
    9/19/22, 12:10 PM
    Theoretical approach for SRF Thin Films & Structures

    In this talk, we started with the cavity degradations' appearance and found two strategies to increase the cavity's thermal conductivity--- the outer-wall groove structure (OGS) and the inner-wall thermal conducting film (ITCF). We performed COMSOL simulations and found them effective. We hope these two structures can improve the thermal conductivity, thus increasing the cavity's Eacc limit.

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