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Fast DAQ system with image rejection for axion dark matter searches

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arxiv 2109.08312 v2 pith:CHZBNTS3 submitted 2021-09-17 physics.ins-det hep-ex

Fast DAQ system with image rejection for axion dark matter searches

S. Ahn , M. J. Lee , A. K. Yi , B. Yeo , B. R. Ko , Y. K. Semertzidis This is my paper
classification physics.ins-det hep-ex
keywords axionsearchesfastdarkefficiencyhaloscopeimagematter
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A fast data acquisition (DAQ) system for axion dark matter searches utilizing a microwave resonant cavity, also known as axion haloscope searches, has been developed with a two-channel digitizer that can sample 16-bit amplitudes at rates up to 180 MSamples/s. First, we realized a practical DAQ efficiency of greater than 99% for a single DAQ channel, where the DAQ process includes the online fast Fourier transforms (FFTs). Using an IQ mixer and two parallel DAQ channels, we then also implemented a software-based image rejection without losing the DAQ efficiency. This work extends our continuing effort to improve the figure of merit in axion haloscope searches, the scanning rate.

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