The BESS-Polar Experiment Program

BESS-Polar, new, ultra-thin, superconducting spectrometer optimized for long-duration balloon flights, is presently under construction, with the goals of extending current BESS measurements of antiprotons to lower energies, extending the search for antinuclei to greater sensitivities and improving the ability to measure light isotopes in the cosmic radiation. A first flight from Antarctica in December 2004 is planned, with a later flight to be made at Solar minimum. The design, operating parameters and scientific prospects of BESS-Polar will be presented.