Trajectory studies for SPEAR3 LTB

Abstract

In this note, trajectory stability in SPEAR3 Linac-to-booster (LTB) transport line is studied. It is observed that an electron gun body temperature variation or a linac RF phase variation may introduce beam energy variation which then translates into a trajectory change after certain dipole magnets. Long time BPM resolution is also investigated, plus a calculation on the initial beam angle variation. Beam trajectory is controlled for a good injection efficiency into the booster, by using the measured response matrix of certain steering correctors. Dispersion is also measured for a future implementation of a beam energy feedback.