Phasing tools for the klystrons at the SLC

Computer-based tools have been developed to aid in the phasing of the klystron RF sources at the SLC (Stanford Linear Collider). Each klystron, and by necessity each sector of klystrons, must be phased correctly to control emittance growth and to preserve the energy and energy spread of the beam. Phasing is accomplished using the beam as the primary reference. This insures that both the total energy gain and the energy gain profile of the linac correspond to the current operational requirements, and also insures that there are no errors in the quadrupole focusing lattice. Changes in hardware can result in different phase values for maximum energy gain; hunting for the sources of these changes continues. Results and operational experience are presented