Conveners
Alternate material based SRF thin films: Part 1
- Grigory Eremeev (Fermilab)
Alternate material based SRF thin films: Part 2
- Thomas Proslier (IRFU, CEA Saclay)
Coating superconducting Nb3Sn thin film on the inner surface of a superconducting RF cavity is one of the most promising approaches to improve the performance of the accelerating cavity. Compared with traditional tin deposition and sputtering processes, electrochemical coating has the advantages on process simplicity, low cost and mass production. In this paper, Electrochemical and thermal...
Bronze route Nb3Sn growth is a well mastered technique used in conductor development which guarantees phase pure Nb3Sn at low temperatures, 600 – 750 °C. Use of bronze route will allow development of Nb3Sn coated Cu or bronze cavities which is much cheaper alternative to Nb3Sn coated Nb cavities. In addition, high thermal conductivity of Cu will facilitate heat removal from the...
In the present work, an alternative route to grow Nb3Sn film for SRF application is presented. Liquid tin diffusion is an established technology for wire fabrication, already explored in the past at LNL for SRF application.
The deposition process has been completely revised, adopting sample pre-anodization to enhance the Nb3Sn nucleation from the tin vapor diffusion and introducing a double...
A tin vapor diffusion system was constructed for Nb3Sn cavity R&D at KEK.
After construction of the vapor diffusion system, we have performed Nb3Sn coating test for several samples.
Several samples are observed and we optimized the coating parameter for cavity coating.
After coating Nb3Sn for the single-cell cavity, flux expulsion and cavity performance were measured.
In this...
Nb3Sn is considered as a potential candidate for superconducting radiofrequency (SRF) cavities for particle acceleration due to its higher critical temperature of 18.3 K and higher superheating field of 400 mT. We fabricated Nb3Sn films by multilayer sputtering and the film properties were optimized by varying the fabrication conditions (multilayer thickness, substrate temperature, annealing...
Alternative materials are required in the SRF field to push the cavity performance limits. At Cornell, we investigate various A15 superconductor options that include Nb3Sn, V3Si, MgB2, and NbTiN thin films. We also explore different deposition approaches and post processes to optimize the material properties. In the workshop, we provide an overview of the ongoing progress at Cornell....
Nearly all superconducting RF (SRF) cavities today use superconducting niobium: whether it be bulk niobium or thin niobium films on copper. However, Nb/Cu cavities must be operated in very strict thermal conditions so as to operate in the residual resistive regime. To overcome this limitation, new thin film materials must be investigated and A-15 superconductors are a promising avenue of...
It is widely accepted that for further improvement in cavity RF performance, innovation is needed and one may have to turn to other forms of Nb and to other superconducting materials. The potential benefits of using materials other than Nb would be a higher Tc, a potentially higher critical field Hc, leading to potentially significant cryogenics cost reduction if the cavity operation temperature...
