SPUD Rational

Take the search for gravity waves to the next level (again!)

Maximally exploit existing infrastructure at Pole:
DASI mount and compressor room (and MAPO)

Maximally exploit technology developed for BICEP2:
Detectors, focal-plane, telescope

Switch from liquid helium to new technology Pulse Tube Coolers
Cool to 4K (-452F) using electric power (8kW each)
This year 3x BICEP2 - next year 5x (if power approved)