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A real-time Data Acquisition (DAQ) system for the CULTASK axion haloscopeexperiment was constructed and tested. The CULTASK is an experiment to searchfor cosmic axions using resonant cavities, to detect photons from axionconversion through the inverse Primakoff effect in a few GHz frequency range ina very high magnetic field and at an ultra low temperature. The constructed DAQsystem utilizes a Field Programmable Gate Array (FPGA) for data processing andFast Fourier Transformation. This design along with a custom Ethernet packetdesigned for real-time data transfer enables 100% DAQ efficiency, which is thekey feature compared with a commercial spectrum analyzer. This DAQ system isoptimally designed for RF signal detection in the axion experiment, with 100 Hzfrequency resolution and 500 kHz analysis window. The noise level of the DAQsystem averaged over 100,000 measurements is around -111.7 dBm. From apseudo-data analysis, an improvement of the signal-to-noise ratio due torepeating and averaging the measurements using this real-time DAQ system wasconfirmed.

Development of an FPGA-based realtime DAQ system for axion haloscope experiments