The First data of axion mass range around 2.5 GHz at CAPP in Korea

The flagship axion experiment of CAPP (Center for Axion and Precision Physics Research) of IBS in Korea, CULTASK (CAPP's Ultra Low Temperature Axion Search in Korea) has been built on a low vibration facility at Munji campus of KAIST (Korea Advanced Institute for Science and Technology). We have prepared one complete direct-search axion experiment with a powerful dilution refrigerator and a 8T superconducting magnet, ready to explore an axion mass range of 2\textasciitilde 2.5 GHz. A resonant cavity (10 cm OD) with a sapphire tuning rod driven by a piezoelectric actuator system was successfully cooled down below 40 mK and showed a very high unloaded Q-factor (\textasciitilde 130,000) even under 8T magnetic field. The RF receiver employs a 1K HEMT amplifier out of the cavity, but the design is flexible enough to replace it with SQUID amplifier when R{\&}D is completed soon. I will present the results of physics data runs in this mass range and our future plans.