Space-charge limitation of a femtosecond photoinjector

Abstract

Experimental investigation of a compact 40-kV diode-type photoelectric DC gun driven by 100fs laser pulses revealed that the space-charge-limited current density could exceed 30kA/cm2 and that the density increased linearly with the accelerating voltage. We explained these important properties by the balance between the cathode surface field and the field produced by sheet-like electron bunches near the cathode surface. Our simple physical model agreed well with the experimental results. Copyright © 2011 Hiroko Yamamoto et al.