Toroidal Electron Guns for Hollow Beams
- 1 June 1959
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 30 (6) , 826-836
- https://doi.org/10.1063/1.1735249
Abstract
A theory of convergent, high-efficiency electron guns for the production of dense hollow beams is presented. An approximate solution to Poisson's equation is obtained in a cylindrical coordinate system modified to account for the toroidal geometry. Experimental measurements on a series of toroidal guns tend to confirm the space-charge theory. They also show that the annular slit in the anode very seriously affects the uniformity of cathode emission and diverges the beam more than can be accounted for by present theories. These effects of the slit appear to confine the usefulness of these guns to high-power applications.This publication has 5 references indexed in Scilit:
- A UHF traveling-wave amplifier tube employing an electrostatically focused hollow beamIRE Transactions on Electron Devices, 1956
- Axially Symmetric Electron Beam and Magnetic-Field SystemsProceedings of the IRE, 1952
- Some Notes on the Design of Electron GunsProceedings of the IRE, 1945
- Rectilinear Electron Flow in BeamsJournal of Applied Physics, 1940
- Currents Limited by Space Charge between Coaxial CylindersPhysical Review B, 1923