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February 2, 2026Open Access

First results from a Nb3Sn-coated 1.5-cell 650 MHz SRF cavity for cryogen-free industrial accelerators

Key Points

The aim is to develop a compact, high-power electron beam accelerator using superconducting technology.
Fabrication and surface preparation of the Nb₃Sn-coated 1.5-cell SRF cavity.
Performance assessments using vertical test stand measurements in a liquid helium bath.
Ensuring the design is suitable for cryogen-free operation.
Initial tests provide positive feedback on the performance of the Nb₃Sn SRF cavity.
Demonstrates potential for continuous-wave operation at targeted specifications.
Represents a significant milestone for adoption in industrial contexts.

Abstract

Fermilab is advancing the development of a compact, high-power electron beam accelerator using superconducting radio frequency (SRF) technology as a non-radioactive alternative to traditional radiological sources. The current design targets continuous-wave (CW) operation at 1.6 MeV and 20 kW. To ensure suitability for industrial environments, the system is being designed for cryogen-free operation, driving the adoption of a novel Nb₃Sn-coated 1.5-cell SRF cavity operating at 650 MHz. This contribution reports on the fabrication, surface preparation, and Nb₃Sn coating process of the cavity, as well as first results from vertical test stand (VTS) measurements performed in a liquid helium bath. These initial tests mark a key milestone toward demonstrating the viability of conduction-cooled Nb₃Sn SRF cavities for industrial-scale deployment.

First results from a Nb3Sn-coated 1.5-cell 650 MHz SRF cavity for cryogen-free industrial accelerators

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