A Superconducting 352 MHz Prototype Cavity for LEP

Advances in Nb3Sn superconducting radiofrequency cavities towards first practical accelerator applications

“…At the maximum field, the cavity showed a Q 0 above 10 10 at 4.4 K. The dissipated power at 10 MV m −1 is just 1.1 watts at 4.4 K, well within the range of large capacity cryocoolers, demonstrating the potential of coatings with this quality for compact accelerator applications. The performance is substantially improved compared to the limited experience reported in the literature of Nb 3 Sn cavities with frequency <1 GHz [3].…”

“…not pulsed) accelerating gradients significantly smaller than Nb, with the best cavities being limited by quench (loss of superconductivity) at 18 MV m −1 , compared to the best Nb cavities reaching up to ∼50 MV m −1 [2]. Furthermore, larger Nb 3 Sn cavities-cavities with more than two cells or with frequency below ∼1 GHz-have in past research programs had limited development and relatively poor performance in the small number of tests performed on them, generally limited to ∼5 MV m −1 [3,4].…”

Nb3Sn superconducting radiofrequency cavities: fabrication, results, properties, and prospects

“…Work at Wuppertal, which included collaboration with Thomas Jefferson National Laboratory [38], resulted in the production of the first multi-cell cavities coated with Nb 3 Sn [39], as well as a number of single-cell 1.5 GHz cavities. Studies on Nb 3 Sn SRF cavities during the 1970s through to the 1990s were also performed at CERN [40], SLAC [41], and Cornell [42].…”

Physics and Accelerator Applications of RF Superconductivity

“…From the pattern and amplitude of the observed temperature rise at increasing field levels, it is possible to deduce the Fowler & Nordheim properties of the emission site. As analyzed from temperature maps, the {3 values of emitters range from 100 to 700, and the area of emitters range from 10-9 to 10-18 m2 (22,36,52). It is clear that when high fields were reached, low {3 values were attained.…”