AVS 52nd International Symposium
    Applied Surface Science Monday Sessions
       Session AS-MoA

Paper AS-MoA9
Novel Field Emission Source for Electron Microscopy

Monday, October 31, 2005, 4:40 pm, Room 206

Session: Electron Spectroscopies
Presenter: J.R. Noonan, Argonne National Laboratory
Authors: J.W. Lewellen, Argonne National Laboratory
J.R. Noonan, Argonne National Laboratory
Correspondent: Click to Email
A novel field emission electron source that combines desirable features of thermionic cathode and photocathode has been designed. Simulations indicate that the electron beam has very small emittance, ~ 2 nm-radian, and high average current. The emittance can be reduced to less than 0.01 nm-radian by taking beam slices, which also reduces the beam current. The source uses high gradient radio frequency (RF) fields to extract electrons off of a field emitter tip and accelerate these electrons to ~1.5 MeV energy. The resulting gun design show promise in a number accelerator and non-accelerator applications, such as energy recovery LINACS, TeraHertz radiation sources, high voltage electron microscopy, electron beam welding, and thin film deposition. This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under contract No. W-31-109-ENG-38.