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Physics > Instrumentation and Detectors
Title: High-volume tunable resonator for axion searches above 7 GHz
(Submitted on 1 Feb 2024 (v1), last revised 23 Apr 2024 (this version, v3))
Abstract: We present results from the first experimental demonstration of a tunable thin-shell axion haloscope. This novel geometry decouples the overall volume of the cavity-based resonator from its resonant frequency, thereby evading the steep sensitivity degradation at high-frequencies. An aluminum $2.6$ L ($41$ $\lambda^3$) prototype which tunes from $7.1$ to $8.0$ GHz was fabricated and characterized at room temperature. An axion-sensitive, straightforwardly tunable $\mathrm{TM}$$_{010}$ mode is clearly identified with a room temperature quality factor, $Q$, of $\sim$$5,000$. The on-resonance $E$-field distribution is mapped and found to agree with numerical calculations. Anticipating future cryogenic operation, we develop an alignment protocol relying only on rf measurements of the cavity, maintaining a form factor of $0.57$ across the full tuning range. These measurements demonstrate the feasibility of cavity-based haloscopes with operating volume $V\gg\lambda^3$. We discuss plans for future development and the parameters required for a thin-shell haloscope exploring the post-inflationary axion parameter space ($\sim$$4$ to $\sim$$30$ GHz) at DFSZ sensitivity.
Submission history
From: Taj Dyson [view email][v1] Thu, 1 Feb 2024 23:13:54 GMT (1821kb,D)
[v2] Wed, 14 Feb 2024 00:28:13 GMT (1822kb,D)
[v3] Tue, 23 Apr 2024 19:46:58 GMT (1828kb,D)
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