Congratulations to Yue Yin and Runqi Kang for publishing  Haloscope Searching for Dark Photons at Q-band with a Novel Coupling Tuning Structure in Physical Review D!

We report the first Q-band haloscope searching for dark photons with a 33.141 GHz cavity. A novel coupling tuning structure separated from the cavity was designed to ensure excellent tunability while maintaining high quality factor. We have established the most stringent constraints χ < 2.5 *10^-12 at a confidence level of 90 % in the frequency range from 33.139 GHz to 33.143 GHz, corresponding to the mass of dark photons ranging from 137.05 µeV to 137.07 µeV. The results surpass the previous astronomical constraints by nearly 3 orders of magnitude. This work has demonstrated the feasibility of dark matter haloscopes at Q band. In the future, the constraints can be further improved by more than one order of magnitude through low temperature experiments, and the setup can be extended to search for axions, axion-like particles, and high-frequency gravitational waves.

 

https://doi.org/10.1103/PhysRevD.111.095022