A Network of Axion Haloscopes: Scan Rate and Frequency Coverage Computed from the Cavity Conversion Equation

A network of four axion haloscopes is designed from the scan-rate equation that governs the search for axion dark matter. Each instrument — an 8 T magnet, a 0.20 cubic metre cavity of loaded quality factor 80,000 and a quantum-limited receiver at 0.35 K system temperature — scans at 0.33 GHz per year at the benchmark coupling. Four instruments on adjacent bands cover 1 to 8 GHz in 5.3 years. The network totals 212 tonnes and 300 kW, most of it cryogenics. All figures are computed from the stated conversion model; the design is simulated, not measured.