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Analytical evaluation of surface barrier and resistance in iron-based superconducting multilayers for Superconducting Radio-Frequency applications

Carlos Redondo Herrero, Akira Miyazaki

Abstract

New superconducting materials, particularly iron-based superconductors (IBS), have recently attracted attention for their potential applications in particle detectors and accelerators. This paper discusses the application of these materials in multilayer structures for radio-frequency resonators used to accelerate charged particles, with the aim of improving performance compared to bulk niobium. These materials are compared with previously studied multilayers composed of conventional superconductors in terms of the maximum magnetic field they can withstand, their surface resistance, and their power loss per unit surface area. Finally, perspectives and future applications aimed at increasing operating temperatures are discussed.

Analytical evaluation of surface barrier and resistance in iron-based superconducting multilayers for Superconducting Radio-Frequency applications

Abstract

New superconducting materials, particularly iron-based superconductors (IBS), have recently attracted attention for their potential applications in particle detectors and accelerators. This paper discusses the application of these materials in multilayer structures for radio-frequency resonators used to accelerate charged particles, with the aim of improving performance compared to bulk niobium. These materials are compared with previously studied multilayers composed of conventional superconductors in terms of the maximum magnetic field they can withstand, their surface resistance, and their power loss per unit surface area. Finally, perspectives and future applications aimed at increasing operating temperatures are discussed.

Paper Structure

This paper contains 17 sections, 36 equations, 7 figures, 2 tables.

Table of Contents

  1. Introduction
  2. Theory
  3. Field distributions
  4. Vortex penetration field
  5. Surface resistance and RF loss
  6. Results
  7. NbN/I/Nb Multilayer Structure
  8. Nb$_3$Sn/I/Nb Multilayer structure
  9. FeSe/I/Nb Multilayer Structure
  10. FeSe/I/Nb$_3$Sn
  11. Discussions
  12. Influence of the substrate
  13. Comparison of various multilayers
  14. Conclusion
  15. Derivation of the EM field inside a multilayer
  16. ...and 2 more sections

Figures (7)

  • Figure 1: Multilayer structure, where the superconductor thin-film is denoted as $S_1$ in the red layer, the insulator layer is denoted as $I$ in the green layer, and the superconductor substrate is denoted as $S_2$ in the turquoise layer. (Color online)
  • Figure 2: Normalized value of the Electric and Magnetic fields inside the multilayered distribution using the parameters of NbN/I/Nb. The naive fields have been determined by using the exponential decay in the superconductors $e^{-x/\lambda}$ for the magnetic field, and for the electric field $\textbf{E}\propto \nabla\times \textbf{B}$ due to the Ampère-Maxwell equation. (Color online)
  • Figure 3: Results for the NbN/I/Nb multilayer structure. Figure (a): maximum applicable field of the multilayer. Figure (b): Surface resistance of the multilayer. (Color online)
  • Figure 4: Results for the Nb$_3$Sn/I/Nb multilayer structure. Figure (a): maximum applicable field of the multilayer. Figure (b): Surface resistance of the multilayer. (Color online)
  • Figure 5: Results for the FeSe/I/Nb multilayer structure. Figure (a): maximum applicable field of the multilayer. Figure (b): Surface resistance of the multilayer. (Color online)
  • ...and 2 more figures