High-Quality-Factor Superconducting Cavities in Tesla-Scale Magnetic Fields for Dark-Matter Searches
S. Posen, M. Checchin, O.S. Melnychuk, T. Ring, I. Gonin, T. Khabiboulline
DOI 10.1103/PhysRevApplied.20.034004 · Physical Review Applied
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Abstract
In dark-matter searches using axion haloscopes, the search sensitivity depends on the quality factors (Q0) of radio-frequency cavities immersed in multitesla magnetic fields. Increasing Q0 would increase the scan rate through the parameter space of interest. Researchers developing superconducting radio-frequency cavities for particle accelerators have developed methods for obtaining extremely high Q0 of approximately 1011 in microteslascale magnetic fields. In this paper, we describe efforts to develop high-Q cavities made from Nb3Sn films using a technique developed for particle-accelerator cavities. Geometry optimization for this application is explored, and two cavities are tested: an existing particle-accelerator-style cavity and a geometry developed and fabricated for use in high fields. A quality factor of (5.3±0.3)×105 is obtained at 3.9 GHz and 6 T at 4.2 K.
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. | — | Pressure not reported | unknown |
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