South Pole Observatory SPT & BICEP • SPT and BICEP Array together form the South Pole Observatory observing the same exceptional low foreground 1500 deg² field. • BICEP Array (including BICEP3) small refractor telescopes provide degree scale B-mode measurements. • SPT provides the arc minute angular resolution for de-lensing the degree scale B-mode measurements. • A new SPT camera "SPT-3G+" being built to start in 2029 could be designed to greatly improve de- lensing sensitivity, leading to σ(r) ~ 0.001 in 2034. Plot showing the SPO σ(r) Forecast. On the y-axis is σ(r) on the x-avis is year from 2019 to 2028. A dark line shows Delensed with SPT-3G. Above that is a line for complex foregrounds, above that is a line for No Delensing. By 2028, the SPT-3G hits the σ(r) = 0.002 line.
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Kelly Lepo
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