Simultaneous Dynamic Compensation of Stopbands and Multipurpose Location of Correction Lenses in the CERN PS Booster

Abstract

Three 3rd order stopbands, amongst them the structural 3Qv = 16 (= number of lattice periods), are compensated simultaneously for the first 100 msec of the acceleration cycle. The location of the correction multipoles was optimized for all relevant resonance harmonics. The ultimate QH-QV working area still being uncertain, all stopbands up to order four as well as 3rd order crossing point were considered when choosing the locations of the new sextupoles and octupoles, eight per type and ring. A solution providing ideal locations for pairs of lenses applying to almost all harmonics was found. Experiments dealing with compensation of 3QV = 16 are described. With simultaneous dynamic correction of 2QH + QV = 14, QH + 2QV 15 and 3QV = 16, high intensity beams of a transverse density hitherto unknown in the PS Booster were obtained.