The axion is expected to solve the strong CP problem of quantum chromodynamics and is one of the leading candidates for dark matter. CAPP in South Korea has several axion search experiments based on cavity haloscopes in the frequency range of 1-6 GHz. The main effort focuses on operation of the experiments with the highest possible sensitivity. It requires maintenance of the haloscopes at the lowest physical temperature in the range of mK and usage of low noise components to amplify the weak axion signal. We report development and operation of low noise amplifiers for 5 haloscope experiments targeting at different frequency ranges. The amplifiers show noise temperatures approaching the quantum limit.
@article{arxiv.2304.07222,
title = {CAPP Axion Search Experiments with Quantum Noise Limited Amplifiers},
author = {Sergey V. Uchaikin and Boris I. Ivanov and Jinmyeong Kim and Çağlar Kutlu and Arjan F. Van Loo and Yasunobu Nakamura and Seonjeong OH and Violeta Gkika and Andrei Matlashov and Woohyun Chung and Yannis K. Semertzidis},
journal= {arXiv preprint arXiv:2304.07222},
year = {2023}
}
Comments
6 pages, 7 figures, 29th International Conference on Low Temperature Physics, August 18-24, 2022, Sapporo, Japan