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The evolution of the raw sensitivity of CMB experiments
Plot illustrating the evolution of the raw sensitivity of CMB experiments, which scales as the total number of bolometers. Ground-based CMB experiments are classed into Stages with Stage II experiments having O (1000) detectors, Stage III experiments having O (10,000) detectors, and a Stage IV experiment (such as CMB-S4) having O (100,000) detectors. Figure from Snowmass CF5 Neutrino planning document.
Current status of CMB-S4CMB-S4: Next Generation CMB Experiment

The ''Stage-4'' ground-based cosmic microwave background (CMB) experiment, CMB-S4, consisting of dedicated telescopes equipped with highly sensitive superconducting cameras operating at the South Pole, the high Chilean Atacama plateau, and possibly northern hemisphere sites, will provide a dramatic leap forward in our understanding of the fundamental nature of space and time and the evolution of the Universe. CMB-S4 will be designed to cross critical thresholds in testing inflation, determining the number and masses of the neutrinos, constraining possible new light relic particles, providing precise constraints on the nature of dark energy, and testing general relativity on large scales.