Jul 3 – 7, 2023
Europe/Rome timezone

Demonstration of a High-Volume Tunable Haloscope Above 7 GHz

Jul 5, 2023, 11:55 AM
20m
G-003

G-003

University of Rijeka, Rijeka, Croatia

Speaker

Taj Dyson (Stanford University)

Description

We present results from a first experimental demonstration of a tunable thin-shell axion haloscope, as proposed in [JCAP02(2021)018]. This novel geometry decouples the overall volume of the haloscope from its resonant frequency, thereby evading the steep sensitivity degradation in scaled high-frequency haloscopes. An aluminum 4 L pathfinder (designed for 6.8-8.2 GHz) has been fabricated and measured at room temperature. A singly polarized, axion-sensitive, TM$_{010}$-like mode is clearly identified against a background of spurious resonances. The on-resonance $E$-field distribution is mapped, verifying results from numerical calculations. With high-precision alignments, we achieve robust tuning over a representative frequency range. Anticipating future cryogenic operations, we demonstrate successful cavity alignments relying only on microwave reflection measurements, achieving a form factor of 0.57 and a room temperature $Q$ of 5,000

Primary author

Taj Dyson (Stanford University)

Co-authors

Ashley Davidson (Stanford University) Prof. Chao-Lin Kuo (Stanford University) Chelsea Bartram (University of Washington) Laura Futamura (Stanford University) Matthew Withers (Stanford University) Tom Liu (Stanford University)

Presentation materials