SRF2025 - 22nd International Conference on RF Superconductivity

Session

Thursday Oral Session: A

THA

25 Sept 2025, 08:30

Ito International Research Center

19. Production of Nb3Sn film on copper substrate by the bronze route and the RF characterization of samples with the quadrupole resonator (THA01)

Ming Lu (Helmholtz-Zentrum Berlin für Materialien und Energie, Institute of Modern Physics, Chinese Academy of Sciences)

25/09/2025, 08:30

MC2: Fundamental SRF research and development

Invited Oral Presentation

Copper-based Nb3Sn cavity is a promising candidate for next generation accelerator applications in the field of superconducting radio frequency (SRF). It combines the excellent thermal conductivity of copper and the superior superconducting properties of Nb3Sn, and has the potential to greatly improve the performance of the SRF cavity. The electrochemical and thermal synthesis (ETS) bronze...

12. Development of Nb3Sn coatings on copper at INFN-LNL (THA02)

Dorothea Fonnesu (Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro)

25/09/2025, 08:50

MC2: Fundamental SRF research and development

Invited Oral Presentation

The successful development of Nb3Sn/Cu coatings for the SRF cavities of next generation particle accelerators would result in the reduction of the needed cryogenic power by a factor 3 with respect to what normally needed for bulk Nb cavities, while maintaining operation at 4.5 K. In the framework of the I.FAST and ISAS collaborations, research activities are carried out at INFN-LNL to develop...

80. Improving quench fields of enhanced-Tc surfaces (THA03)

Nathan Sitaraman (Cornell University)

25/09/2025, 09:10

MC2: Fundamental SRF research and development

Invited Oral Presentation

The sensitivity of compound superconductors to gradient-limiting defects is well established. To overcome this challenge and develop recipes for enhanced-Tc surfaces that approach their fundamental limits, we take a multi-pronged theoretical approach: we identify material systems where low-Tc or normal-conducting defects are less likely to occur, where bulk superconducting properties favor...

25. Studies as a function of different ALD capping layers on cavity losses for QIS and accelerators (THA04)

Laura Grassellino (Fermi National Accelerator Laboratory)

25/09/2025, 09:30

MC2: Fundamental SRF research and development

Invited Oral Presentation

Niobium-based bulk SRF cavities have demonstrated exceptional performance. To further improve niobium cavity performance, we present studies involving a novel surface engineering process designed to prevent the formation of amorphous niobium oxides on the surface. This is achieved by encapsulating the niobium surface using thermal Atomic-Layer-Deposition (ALD). This technique has been shown to...

20. Investigation of anti-Q-slope and Q-slope effects in SRF cavities: a unified theoretical framework (THA05)

Antonio Bianchi (Istituto Nazionale di Fisica Nucleare)

25/09/2025, 09:50

MC2: Fundamental SRF research and development

Invited Oral Presentation

In the SRF community, the origin of the anti-Q-slope in bulk niobium cavities and the Q-slope in niobium-coated copper cavities remains an open question. In this contribution, we propose a theoretical framework explaining both phenomena through a unified approach. The distribution function of quasiparticles may play a crucial role in the response of a superconductor exposed to radio-frequency...

17. Nonequilibrium corrections and Higgs mode in superconducting devices: unraveling the pronounced Anti-Q slope in high-frequency regime and current-dependent kinetic inductance (THA06)

Takayuki Kubo (High Energy Accelerator Research Organization)

25/09/2025, 10:10

MC2: Fundamental SRF research and development

Invited Oral Presentation

The anti-Q-slope observed in superconducting RF (SRF) cavities has been a longstanding puzzle. Previous studies by Gurevich [1] and Kubo-Gurevich [2] linked this phenomenon to the smearing of the density of states under high RF current. However, the experimentally observed trend of a more pronounced anti-Q-slope with increasing frequency remains unexplained. Recent theoretical investigations...