Speaker
Description
The Axion Dark Matter eXperiment (ADMX) is a major haloscope experiment that has achieved DFSZ sensitivity at around 1 GHz. VERA (“Volume Enhanced Resonators for Axions”) is an ADMX high-frequency working group that explores new geometries for resonators with volumes far exceeding $\lambda^3$ ($V\gg \lambda^3$). The main objective is to extend ADMX's sensitivity to theoretically motivated axion models up to approximately 40 GHz using the existing magnet infrastructure through a combination of haloscope and detector advancements.
In this talk, I will present two volume-enhanced haloscope concepts and share the latest experimental results. ADMX-Bee, a near-term upgrade under strong consideration by the collaboration, will target the 2.6–5.3 GHz range using the novel “beehive” geometry. This tubable honeycomb resonator is made of a hexagonal array of strongly coupled cavities that produce a single coherent resonance mode, allowing for a volume orders of magnitude larger than a conventional cylindrical cavity operating at the same frequency. We have developed a 19-cell prototype beehive and observed a tunable high-Q resonance across multiple cells at room temperature.
I will also present the recent development in tunable wedge-cavity geometries, which are viable candidates for haloscope resonators above approximately 8 GHz. We developed a prototype 9-11 GHz triple-wedge cavity that features fully independent multi-degree-of-freedom adjustments and power combination. I will present the latest experimental results that demonstrate a coherently resonant cavity with an effective volume greater than $10^2 \lambda^3$ .
| Primary Abstract Topic | Experiment: Axions and Wave-Like-DM |
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