Author : J. L. Palmer
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.3/5 (91 download)
Book Synopsis Effects of Thermal Velocities in Magnetically Focused Electron Beams by : J. L. Palmer
Download or read book Effects of Thermal Velocities in Magnetically Focused Electron Beams written by J. L. Palmer and published by . This book was released on 1961 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.