Extensive search for axion dark matter over 1\,GHz with CAPP's Main Axion eXperiment

Saebyeok Ahn, JinMyeong Kim, Boris I. Ivanov, Ohjoon Kwon, HeeSu Byun, Arjan F. van Loo, SeongTae Par, Junu Jeong, Soohyung Lee, Jinsu Kim, Çağlar Kutlu, Andrew K. Yi, Yasunobu Nakamura, Seonjeong Oh, Danho Ahn, SungJae Bae, Hyoungsoon Choi, Jihoon Choi, Yonuk Chong, Woohyun Chung, Violeta Gkika, Jihn E. Kim, Younggeun Kim, Byeong Rok Ko, Lino Miceli, Doyu Lee, Jiwon Lee, Ki Woong Lee, MyeongJae Lee, Andrei Matlashov, Pallavi Parashar, Taehyeon Seong, Yun Chang Shin, Sergey V. Uchaikin, SungWoo Youn, Yannis K. Semertzidis
High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph)
2024-02-20 00:00:00
We report an extensive high-sensitivity search for axion dark matter above 1\,GHz at the Center for Axion and Precision Physics Research (CAPP). The cavity resonant search, exploiting the coupling between axions and photons, explored the frequency (mass) range of 1.025\,GHz (4.24\,$\mu$eV) to 1.185\,GHz (4.91\,$\mu$eV). We have introduced a number of innovations in this field, demonstrating the practical approach of optimizing all the relevant parameters of axion haloscopes, extending presently available technology. The CAPP 12\,T magnet with an aperture of 320\,mm made of Nb$_3$Sn and NbTi superconductors surrounding a 37-liter ultralight-weight copper cavity is expected to convert DFSZ axions into approximately $10^2$ microwave photons per second. A powerful dilution refrigerator, capable of keeping the core system below 40\,mK, combined with quantum-noise limited readout electronics, achieved a total system noise of about 200\,mK or below, which corresponds to a background of roughly $4\times 10^3$ photons per second within the axion bandwidth. The combination of all those improvements provides unprecedented search performance, imposing the most stringent exclusion limits on axion--photon coupling in this frequency range to date. These results also suggest an experimental capability suitable for highly-sensitive searches for axion dark matter above 1\,GHz.
PDF: Extensive search for axion dark matter over 1\,GHz with CAPP's Main Axion eXperiment.pdf
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