Production of and experimentation with antihydrogen at LEAR

This chapter examines the formation of antihydrogen via radiative capture of positrons by antiprotons in flight. The antihydrogen atoms obtained will constitute the first antiatoms ever produced and will be the most suitable species of antiatoms to study questions related to matter-antimatter symmetries. Topics considered include radiative capture, positron production, production from electrons, the use of the large electron-positron (LEP) injection system, positron production from 26 GeV protons, positrons from a β emitter, interaction schemes, the one-passage scheme, the storage ring scheme, cooling of the positron beam, production of a pulsed beam of cooled positrons, H /SUP -o/ formation by laser induced radiative capture, and experiments with antihydrogen atoms (composition of the extracted beam; monitoring of the H /SUP -o/ -atoms; optical spectroscopy of H /SUP -o/; measurement of the 2P /SUB 1/2/ -2P /SUB 1/2/ Lamb Shift). It is demonstrated that a few antihydrogen atoms per second may be formed at the Low-Energy Antiproton Ring (LEAR) by radiative capture from a cooled beam of positrons. A concept is presented where the cooling is done in a positron storage ring which partially overlaps with a straight section of the LEAR