X-Message-Number: 29526 From: "Basie" <> Subject: Bubbles Date: Sat, 26 May 2007 00:06:25 -0400 >Once a hole has been drilled, a deployment team begins lowering a string of >60 optical detectors into it. It takes 11 hours to deploy a single string >and several days for the water in the hole to freeze again. Then atop each of the deep ice strings, UD scientists and technicians are installing two 650-gallon tanks of water that each contain two optical detectors. The tanks are filled with water, and the freeze is controlled to produce perfectly clear ice, with no bubbles or cracks. "The purpose of IceTop on the surface is to detect high-energy cosmic rays that interact in the atmosphere above IceCube," Gaisser noted. "By detecting the same events with IceTop and the deep detectors of IceCube, we expect to get new information about the origin of the most energetic particles in nature. At the same time, the surface detectors help IceCube reject the background of downward cosmic-ray events that obscures the signals of neutrinos coming up through the Earth from below."> http://www.sciencedaily.com/releases/2007/05/070523181619.htm This made me wonder if CI and Alcor degas their suspension solutions. Basie Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=29526