Speaker
Dr
Woohyun Chung
(CAPP/IBS)
Description
CAPP’s flagship axion experiment, CULTASK, employs dilution refrigerators to lower the physical temperature of resonant cavities to less than 40 mK - the coldest ever for axion search. We prepared a complete experimental setup (CAPP-PACE) equipped with an 8 T superconducting magnet with 12 cm inner bore in order to search for axions with mass around 10 µeV. The frequency tuning system installed in a split-design resonant cavity with a high Q-factor utilizes piezoelectric actuators with interchangeable sapphire and copper rods and performs flawlessly in searching a wide range of axion mass. The feeble signal (~10^-24 W) from the cavity is amplified and transmitted through the RF receiver chain, specially designed to minimize the noise temperature of the system employing an 1 K HEMT or a quantum-limited SQUID (Superconducting Quantum Interference Device) amplifier, which eventually raise the sensitivity and speed up the axion search. I will present the results from the CAPP’s first physics data in the axion mass range from 9.83 to 11.38 µeV and discuss our future plans.
Primary author
Dr
Woohyun Chung
(CAPP/IBS)
Co-authors
Mr
Caglar Kutlu
(KAIST/CAPP)
Mr
Danho Ahn
(KAIST/CAPP)
Mr
Doyu Lee
(KAIST/CAPP)
Mr
Jinsu Kim
(KAIST/CAPP)
Dr
Ohjoon Kwon
(IBS/CAPP)
Prof.
Yannis Semertzidis
(CAPP/IBS and KAIST)
