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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2402.01060 |
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| _version_ | 1866929325981302784 |
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| author | Dyson, Taj A. Bartram, Chelsea L. Davidson, Ashley Ezekiel, Jonah B. Futamura, Laura M. Liu, Tongtian Kuo, Chao-Lin |
| author_facet | Dyson, Taj A. Bartram, Chelsea L. Davidson, Ashley Ezekiel, Jonah B. Futamura, Laura M. Liu, Tongtian Kuo, Chao-Lin |
| contents | 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 ($41$ $λ^3$) 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 $V\ggλ^3$. 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_01060 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | High-volume tunable resonator for axion searches above 7 GHz Dyson, Taj A. Bartram, Chelsea L. Davidson, Ashley Ezekiel, Jonah B. Futamura, Laura M. Liu, Tongtian Kuo, Chao-Lin Instrumentation and Detectors Instrumentation and Methods for Astrophysics High Energy Physics - Experiment 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 ($41$ $λ^3$) 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 $V\ggλ^3$. 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. |
| title | High-volume tunable resonator for axion searches above 7 GHz |
| topic | Instrumentation and Detectors Instrumentation and Methods for Astrophysics High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2402.01060 |