Ponderomotive Enhancement of Charged Particle Beam Limiting Current

Celso Grebogi*, Han S. Uhm

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution


The space-charge-limiting current problem is investigated for a magnetized particle beam propagating in a cylindrical drift tube and in the presence of a waveguide mode. It is shown that with a proper choice of a waveguide mode, the limiting current can be greatly enhanced due to ponderomotive effects. Physically, this is accomplished by using the ponderomotive energy to reduce the potential depression due to the beam's self-space-charge field. Formulas for the limiting current as a function of beam energy and waveguide RF field for solid and hollow beams are derived. It is found from these formulas that in appropriate parameter regimes, the space charge limiting current of, say, a 250-kV beam can be enhanced by 70%.

Original languageEnglish
Title of host publicationProceedings of the 1987 IEEE Particle Accelerator Conference: Accelerator Engineering and Technology
EditorsEric R. Lindstrom, Louise S. Taylor
PublisherIEEE Press
Number of pages3
Publication statusPublished - 1987


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