Accepted Paper

First continuous wave 7.1 MeV electron beam acceleration with a Nb $_{3}$ Sn superconducting radio-frequency cryomodule at 4.3 K

Uttar Pudasaini, Gianluigi Ciovati, Ramakrishna Bachimanchi, Alejandro Castilla, Jonathan Creel, Matthew Poelker, Michael Drury, John Fischer, Jake Magnin, Peter Owen, Thomas Powers, Tomasz Plawski, Haipeng Wang, Shaoheng Wang, Yan Wang, Matt Weaks, and Rongli Geng

Phys. Rev. Lett. - Accepted 9 October, 2026

DOI: https://doi.org/10.1103/dt7k-27hr

Abstract

We report on the electron beam acceleration with a Nb_3Sn superconducting radio-frequency (SRF) cryomodule operating at 4.3 K and 2.1 K. Two 5-cell, 1.5 GHz Nb cavities coated with a Nb_3Sn thin film cooled at 4.3 K with liquid helium inside the cryomodule accelerated a 5 µA continuous-wave electron beam from 200 keV to 7.1 MeV. One of the cavities achieved a maximum accelerating gradient of 11.8 MV m^{-1} with a quality factor of ~4 × 10^9 at 4.3 K. These results represent the highest energy gain ever achieved by a Nb3Sn cryomodule operating at 4.3 K and demonstrate the feasibility of this technology for future particle accelerators for scientific research as well as for medical and industrial applications.

If the author has provided any supplemental materials with this article they will be available upon publication of the version of record.

Physical Review Letters

First continuous wave 7.1 MeV electron beam acceleration with a Nb $_{3}$ Sn superconducting radio-frequency cryomodule at 4.3 K

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First continuous wave 7.1 MeV electron beam acceleration with a Nb3Sn superconducting radio-frequency cryomodule at 4.3 K

Abstract

First continuous wave 7.1 MeV electron beam acceleration with a Nb $_{3}$ Sn superconducting radio-frequency cryomodule at 4.3 K