DALI: How a Phased Array Catches an Axion in a Half-Open Resonator
An orchestra of a hundred violins plays in a vast hall. The conductor stands before them but cannot get the instruments to sound in unison: every bow moves at its own tempo, and the music crumbles into noise. The axion search problem looks much the same. These dark matter particles, thought to stream through us every second, turn into microwave photons only when the conditions line up with extreme precision.