Bevatron Operation and Development. XVII. Period Covered

Book excerpt: Beam evaluation was completed preparatory to a K/sup +/p/sup +/ scattering experiment. The K+ meson beam was also used to expose sixteen emulsion stacks for eight outside groups. The study of K- mesons continued, using the liquid hydrogen bubble chamber and emulsions. Antiproton interactions were observed by using counters, the propane bubble chamber, and nuclear emulsions; p-p( - ) interactions were also observed in the hydrogen bubble chamber. Three target bombardments were made for the laboratory chemistry group and sixteen borabardments made for external groups. The rapid beam ejector was successfully operated and has been used to produce short beam pulses, 20 microseconds in duration, for bubble chamber runs. On April 23, 1950, Bevatron operation was suspended when a bolt was sheared off the armature of the east generator, resulting in abrasion and fire damage to one-third of the stator windings and in electrical arc damage to a bearing and journal. Operation is scheduled to resume on May 26, 1958, with one generator, after an inspection has been made of the east machine. The damaged generator is expected to be operable about the end of July. (For preceding period see UCRL-8261.) (auth).