Advances in development of Nb3Sn superconducting radio-frequency cavities
Sam Posen, Matthias Liepe
DOI 10.1103/PhysRevSTAB.17.112001 · Physical Review Special Topics - Accelerators and Beams
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
A 1.3 GHz Nb3Sn superconducting radio-frequency cavity prepared with a modified annealing step reached Bpk>50 mT, well above Bc1=25±7 mT, without the strong Q-slope observed in previous Nb3Sn cavities. At 4.2 K, it has a Q0 of approximately 1×1010 at >10 MV/m, far outperforming Nb at useable gradients. At 2 K, quench occurred at ∼55 mT, apparently due to a defect, so additional treatment may increase the maximum gradient. Material parameters of the coating were extracted from Q vs T data, including a Tc of 18.0±0.1 K, close to the maximum literature value. High power pulses were used to reach fields far higher than in CW measurements, and near Tc, quench fields close to the superheating field were observed. Based on a review of previous experience with Nb3Sn cavities, a speculative mechanism involving weak link grain boundaries is presented to explain how the modified annealing step could be the cause of the absence of strong Q-slope. Finally, an analysis of the progress to date provides hints that the path forward for Nb3Sn cavities should focus on minimizing defects.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb3Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | unknown |
Similar papers
Enhanced electron-phonon coupling of Ti-doped superconducting Nb3Sn films investigated at microwave frequencies
similarity 0.96M. Perpeet & M. A. Hein
Source status unknown — claims are unverified
High-frequency diode effect in superconducting Nb3Sn microbridges
similarity 0.95Sara Chahid et al.
Source status unknown — claims are unverified
Evolution of T2 resistivity and superconductivity in Nb3Sn under pressure
similarity 0.95Z. Ren et al.
Source status unknown — claims are unverified
Improved high-gradient performance for medium-velocity superconducting half-wave resonators: Surface preparation and trapped flux mitigation
similarity 0.94Yuting Wu et al.
Source status unknown — claims are unverified
Interplay between lattice dynamics and superconductivity in Nb3Sn thin films
similarity 0.94S. Couet et al.
Source status unknown — claims are unverified
Flux penetration into superconducting Nb3Sn in oblique magnetic fields
similarity 0.93Diana G. Gheorghe et al.
Source status unknown — claims are unverified