A 5 GeV injector for PEP

The authors describe a project for providing the SSRL (Stanford Synchrotron Radiation Laboratory) with a dedicated injector for both PEP (Positron-Electron Project) and SPEAR by upgrading the SPEAR 3-GeV injector synchrotron, a 10-Hz cycling synchrotron served by a 150-MeV linac capable of accelerating 10¹⁰ or more electrons per cycle now under construction, to function at 6 GeV and by transporting the electron beam through a 240-m-long tunnel to PEP. After injection at 5 GeV, the energy of PEP will be ramped to 6-10 GeV for most anticipated dedicated operation for synchrotron radiation research. As an interim dedicated injector, it will facilitate the utilization and development of PEP as a synchrotron radiation source until a full-energy, dedicated injector is warranted