Fast DAQ system with image rejection for axion dark matter searches

TL;DR

This paper presents a high-speed, efficient data acquisition system with image rejection capabilities for axion dark matter searches, significantly enhancing the scanning rate in axion haloscope experiments.

Contribution

Developed a two-channel 16-bit DAQ system with over 99% efficiency and implemented software-based image rejection to improve axion search sensitivity.

Findings

Achieved >99% DAQ efficiency including FFT processing

Implemented effective software-based image rejection

Enhanced the scanning rate for axion haloscope searches

Abstract

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.