Taiwan Axion Search Experiment with Haloscope: Designs and operations

TL;DR

This paper details a haloscope axion search experiment near 19.6 μeV using a tunable cavity in a strong magnetic field, setting new limits on axion-photon coupling with detailed experimental design.

Contribution

It introduces a novel experimental setup and methodology for axion detection at specific energies, expanding the search parameters and improving sensitivity.

Findings

Excluded axion-photon coupling constants above 8.1×10⁻¹⁴ GeV⁻¹

Achieved a system noise temperature of approximately 2.2 K

Conducted the search over about one month in a specific mass range

Abstract

We report on a holoscope axion search experiment near $19.6\ {\rm \mu eV}$ from the TASEH collaboration. The experiment is carried out via a frequency-tunable cavity detector with a volume $V = 0.234\ {\rm liter}$ in a magnetic field $B_0 = 8\ {\rm T}$. With a signal receiver that has a system noise temperature $T_{\rm sys} \cong 2.2\ {\rm K}$ and experiment time about 1 month, the search excludes values of the axion-photon coupling constant $g_{\rm a\gamma\gamma} \gtrsim 8.1 \times 10^{-14} \ {\rm GeV}^{-1}$, a factor of 11 above the KSVZ model, at the 95\% confidence level in the mass range of $19.4687-19.8436\ {\rm \mu eV}$. We present the experimental setup and procedures to accomplish this search.