Multilayer model for coatings with arbitrary layers for superconducting radio-frequency applications
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866910201898074112 |
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| author | Gobeyn, Aaron Ackermann, Wolfgang De Gersem, Herbert |
| author_facet | Gobeyn, Aaron Ackermann, Wolfgang De Gersem, Herbert |
| contents | We extend the multilayer model of \etal{Kubo} for superconductor-insulator-superconductor (SIS) structures in two ways:
first, by generalizing it to arbitrary sequences of layers of arbitrary type, i.e. superconducting, normal conducting, and
insulating; and second, by accounting for all contributions, including ohmic losses and dielectric effects. We examine the maximum
applicable field for $(\text{SI})^n\text{S}$ structures. We find that the optimum configuration corresponds to the
$n=1$ case. However, the thickness of the superconducting coating layers can be reduced to below their penetration depth
with minor performance penalty. We discuss the ability to model transitions in SS bilayers by introducing a set of virtual layers
that represent the transition region through interpolated parameters. We find degradation of the maximum applicable field
with thicker transition layers, and a larger effective penetration depth of the electromagnetic fields. Furthermore,
the surface impedance of the multilayer structure is calculated using the Leontovich boundary condition, yielding a formulation
suitable for integration into finite element simulations. Additionally, the Poynting theorem is used to determine the loss
contributions of individual layers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_07958 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Multilayer model for coatings with arbitrary layers for superconducting radio-frequency applications Gobeyn, Aaron Ackermann, Wolfgang De Gersem, Herbert Accelerator Physics Superconductivity We extend the multilayer model of \etal{Kubo} for superconductor-insulator-superconductor (SIS) structures in two ways: first, by generalizing it to arbitrary sequences of layers of arbitrary type, i.e. superconducting, normal conducting, and insulating; and second, by accounting for all contributions, including ohmic losses and dielectric effects. We examine the maximum applicable field for $(\text{SI})^n\text{S}$ structures. We find that the optimum configuration corresponds to the $n=1$ case. However, the thickness of the superconducting coating layers can be reduced to below their penetration depth with minor performance penalty. We discuss the ability to model transitions in SS bilayers by introducing a set of virtual layers that represent the transition region through interpolated parameters. We find degradation of the maximum applicable field with thicker transition layers, and a larger effective penetration depth of the electromagnetic fields. Furthermore, the surface impedance of the multilayer structure is calculated using the Leontovich boundary condition, yielding a formulation suitable for integration into finite element simulations. Additionally, the Poynting theorem is used to determine the loss contributions of individual layers. |
| title | Multilayer model for coatings with arbitrary layers for superconducting radio-frequency applications |
| topic | Accelerator Physics Superconductivity |
| url | https://arxiv.org/abs/2605.07958 |