The focussing of narrow electron-beams in vacuo

✍ Scribed by A. Bouwers

• Book ID: 104161071
• Publisher: Elsevier Science
• Year: 1935
• Weight: 337 KB
• Volume: 2
• Category: Article
• ISSN: 0031-8914
• DOI: 10.1016/s0031-8914(35)90076-3

✦ Synopsis

The focussing of electron beams by means of electric fields is studied after discussion of the dispersion caused by space-charge. The basis for the calculations was a t h i n band-shaped beam, b u t conclusions are drawn with respect to circular beams. The focal distances for the axially symmetrical fields (circular beams} are always twice the values found for flat beams, as long as space-charge effect is negligible.

The method followed for calculating focal distances is essentially the application of 1) H. Busch,