Ocean Observations Required to Minimize Uncertainty in Global Tsunami Forecasts, Warnings, and Emergency Response

It is possible that no catastrophe has mobilized the global ocean science and coastal emergency management communities more than the 2004 Indian Ocean tsunami.Though the Pacific tsunami threat was recognized, and a warning system had been in place since 1965, there was no warning system in the Indian Ocean, and almost 230,000 people perished.More b

read more

Generation of a bunched positron beam extracted nonadiabatically from a buffer-gas trap and focused in a free field region

Advanced spectroscopy experiments and new physics experiments with positronium atoms in vacuum will benefit from positronium production in an environment free of magnetic and electrostatic fields.Here, we present a novel scheme for generating a bunched positron beam.The positron bunches are prebunched before extraction from a buffer-gas trap, nonad

read more