University of Maryland
Atlantic Building, Room 2400
4:30 PM Monday, November 20, 2006
Coffee, Tea & Snacks 4:15-4:30 PM

MooHyun Lee
IPST, University of Maryland

Performance of the CREAM calorimeter

The Cosmic Ray Energetics And Mass (CREAM) balloon-borne experiment was designed to directly measure cosmic-ray particle spectra of single elements from hydrogen to iron in the energy range from ~1011 to ~1015 eV. CREAM had two successful flights, launched in Antarctica on December 2004 and December 2005, with a combined duration of 70 days and a total of about 67 million science events collected. Energies of incoming cosmic-ray particles were measured using a sampling tungsten/scintillating fiber calorimeter. The CREAM calorimeter is comprised of 20 layers of tungsten, each 1 radiation length (X0) thick, interleaved with 20 active layers, each made up of fifty 1 cm wide scintillating fiber ribbons. Performance of the calorimeter in various tests carried out during the construction and in flights will be presented.