Researches on new photocathode for RF electron gun

Semiconductor photocathode and metal photocathode have different properties , To consider the properties of both, we studied a new type of photocathode - ion implanted photocathode. Cesium ions are implanted into a metal subst rate. A photocathode preparation chamber is set up to make this photocathod e. A cesium ion source is attached to the common photocathode preparation c hamber. In the past two years, we finished making this photocathode and did research on its properties. A series of experiments have been done with di fferent metal substrates, implanting dosages and implanting energies, in or der to get a kind of photocathode material with high quantum efficiency and good stability. An increase of quantum efficiency after implantation has b een observed. A more interesting result is that the emission spectrum becom es broader. (C) 2000 Elsevier Science B.V. All rights reserved.