Tuning of the LCLS Linac for User Operation

With the Linac Coherent Light Source (LCLS) now in its third user run reliable electron beam delivery at various beam energies and charge levels has become of high operational importance. In order to reduce the beam tuning time required for such changes, several diagnostics and feedforward procedures have been implemented. We report on improved lattice diagnostics to detect magnet and model errors as well as on measurements of transverse RF kicks and static magnetic field contributions and corresponding correction procedures to facilitate beam energy changes.