Demonstration of $E$_acc = 10 MV m⁻¹ with Nb₃Sn cavities in a cryomodule

Accelerating cryomodules with superconducting cavities are key components for particle accelerators. The efficiency, energy gain and operating temperature of cavities drive the operating and capital costs; hence, advances in these areas enable future accelerators. While superconducting cavities are currently made from Nb, Nb₃Sn, with a superconducting transition temperature and superheating field approximately twice that of Nb, is poised to substantially improve the efficiency and energy gain. We present results from the first cryomodule with two five-cell 1.5 GHz superconducting radiofrequency Nb cavities coated with Nb₃Sn, which attained an accelerating gradient of ⩾10 MV m⁻¹ with low cryogenic loss at 4.4 K.. Authors: Eremeev, Grigory V. [Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)] (ORCID:0000000238211300); Pudasaini, Uttar [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)]; Cheban, Sergey [Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)] (ORCID:0009000067314918); Ciovati, Gianluigi [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)] (ORCID:0000000193167704); Drury, Michael [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)]. DOE Contract: 89243024CSC000002; AC05-06OR23177. Subjects: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY