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Yang, Byeong Su
액시온 및 극한상호작용 연구단
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Extended Axion Dark Matter Search Using the CAPP18T Haloscope

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Title
Extended Axion Dark Matter Search Using the CAPP18T Haloscope
Author(s)
Byeongsu Yang; Yoon, Hojin; Moohyun Ahn; Lee, Youngjae; Jonghee Yoo
Publication Date
2023-08
Journal
Physical Review Letters, v.131, no.8
Publisher
American Physical Society
Abstract
We report an extended search for the axion dark matter using the CAPP18T haloscope. The CAPP18T experiment adopts innovative technologies of a high-temperature superconducting magnet and a Josephson parametric converter. The CAPP18T detector was reconstructed after an unexpected incident of the hightemperature superconducting magnet quenching. The system reconstruction includes rebuilding the magnet, improving the impedance matching in the microwave chain, and mechanically readjusting the tuning rod to the cavity for improved thermal contact. The total system noise temperature is ∼0.6 K. The coupling between the cavity and the strong antenna is maintained at β ≃ 2 to enhance the axion search scanning speed. The scan frequency range is from 4.8077 to 4.8181 GHz. No significant indication of the axion dark matter signature is observed. The results set the best upper bound of the axion-photon-photon coupling (gaγγ ) in the mass ranges of 19.883 to 19.926 μeV at ∼0.7 × jgKSVZ aγγ j or ∼1.9 × jgDFSZ aγγ j with 90% confidence level. The results demonstrate that a reliable search of the high-mass dark matter axions can be achieved beyond the benchmark models using the technology adopted in CAPP18T
URI
https://pr.ibs.re.kr/handle/8788114/14272
DOI
10.1103/PhysRevLett.131.081801
ISSN
0031-9007
Appears in Collections:
Center for Axion and Precision Physics Research(액시온 및 극한상호작용 연구단) > 1. Journal Papers (저널논문)
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