Abstract

To design an efficient source for generation of femtosecond (≤200 fs) bursts of high-energetic (20–40 KeV), high intensive (10³-10⁹) photoelectrons, a variety of photocathodes were investigated. Among them there are high-vacuum classical ones like multialkali (Na-K-Sb-Cs) and silver-caesium- oxide (Ag-Cs-O), NEA-photocathodes based on InGaAs/InP/Ag-heterostructures, as well as atmosphere resistant photoemitters like traditional metals (Au, Al, etc) and oxidized alloys like (AlMgCu)O_x. A chosen photocathode was placed inside demountable vacuum chamber in which a specially developed electrostatic electron lens (so- called electron gun) was also installed.

© 1996 Optical Society of America