Amplification on relativistic electron beams in combined helical and axial magnetic fields

L. Friedland*, A. Fruchtman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

A free-electron laser with the guide magnetic field operating as an amplifier is analyzed. A simple dispersion relation, similar in form with or without the guide field, is derived. The study of the solutions of the dispersion relation indicates that the guide allows us to (a) enhance the spatial instability in the amplifier, and (b) significantly extend the frequency range of the instability to lower and higher frequencies. This improved operation of the amplifier with the guide field may be achieved at lower values of the pump helical magnetic field. An expression for the power gain in the amplifier as a function of its length is derived and applied in numerical examples to demonstrate the effects of the guide field.

Original languageEnglish
Pages (from-to)2693-2706
Number of pages14
JournalPhysical Review A
Volume25
Issue number5
DOIs
StatePublished - 1982

Fingerprint

Dive into the research topics of 'Amplification on relativistic electron beams in combined helical and axial magnetic fields'. Together they form a unique fingerprint.

Cite this