Preliminary conceptual design for a 510 MeV electron/positron injector for a UCLA φ factory

UCLA is proposing a compact suer conducting high luminosity (1032-33 cm-2sec-1) e+e- collider for a φ factory. To achieve the required e+e- currents, full energy injections from a linac with intermediate storage in a Positron Accumulator Ring (PAR) is used. The elements of the linac are outlined with cost and future flexibility in mind. The preliminary conceptual design starts with a high current gun similar in design to those developed at SLAC and at ANL (for the APS). Four 4-section linac modules follow, each driven by a 60 MW klystron with a 1 μsec macropulse and an average current of 8.6 A. The first 4-section model is used to create positrons in a tungsten target at 186 MeV. The three remaining three modules are used to accelerate the e+e- beam to 558 MeV (no load limit) for injection into the PAR