A HIGH-CHARGE AND SHORT-PULSE RF PHOTOCATHODE GUN FOR WAKE-FIELD ACCELERATION

In this paper we present a design report on 1-1/2 cell, L-Band RF phot ocathode gun which is capable of generating and accelerating electron beams with peak currents > 10 kA. We address several critical issues o f high-current RF photoinjectors such as longitudinal space charge eff ect, and transverse emittance growth. Unlike conventional short electr on pulse generation, this design does not require magnetic pulse compr ession. Based on numerical simulations using SUPERFISH and PARMELA, th is design will produce 100 nC beam at 18 MeV with r.m.s. bunch length 1.25 mm and normalized transverse emittance 108 mm mrad. Applications of this source beam for wake-field acceleration are also discussed. (C ) 1998 Elsevier Science B.V. All rights reserved.