Abstract
A superconducting magnet spectrometer was launched up to an altitude of 36.5km by using a large bolloon-borne in order to observe high energy cosmic rays and to search for primordial antimatter in the Universe. The first balloon-borne experiment was successfully carried out in Northern Canada in summer of 1993. Development of the superconducting magnet spectrometer and progress of the baloon-borne experiment are described in this report.
