Effects of Cathode Surface Roughness on the Quality of Electron Beams
Abstract
The effects of the roughness of the cathode surface on the emittance of an electron beam are examined. Tentative scaling laws are suggested which yield the bounds on the beam emittance due to surface roughness for both temperature limited and space charge limited regimes. These formulas are found to be consistent with numerical integration of electron trajectories over a wide range of parameters. In general, roughness-induced beam emittance may be reduced by a factor of two to five, if the cathode is operated in the space charge limited regime rather than in the temperature limited regime.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 12, 1986
- Accession Number
- ADA173189
Entities
People
- Yueying Lau
Organizations
- United States Naval Research Laboratory