EFFECTS OF THERMAL VELOCITIES IN MAGNETICALLY FOCUSED ELECTRON BEAMS
Abstract
Three different models for representing an axially symmetric, magnetically focused electron beam, the laminar model, the optical model and the ballistic model, are analyzed mathematically and the computed behavior of each is compared with experimental observations of real electron beams. The over-all behavior of the laminar model agrees to some ex ent with the behavior of real electron beams; however, the motion of individual electrons or groups of electrons is not at all well predicted by the laminar model. The optical model describes with good accuracy the motion of individual electrons or groups of electrons, as well as the over-all behavior of real beams. The spreading of a beam by ther al velocities and the appearance of images in the current density at periodic intervals along a beam, phenomena that are observed experimentally, are predicted accurately by the optical model. Simple forms of lens aberrations are also treated with the aid of the optical model. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1961
- Accession Number
- AD0267039
Entities
People
- J.l. Palmer
Organizations
- University of California, Berkeley