Experimental results of nonrelativistic electron beam trapping and energy transfer in a compton scattering free electron laser scheme

R. Z. Olshan*, A. Gover, S. Ruschin, H. Kleinman, A. Friedman, B. Steinberg, I. Katz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We report the first observation of electron trapping and the energy transfer effect induced by two counter-propagating laser beams. The beam sources were two CO2 transversely excited lasers, operating at 9.3 μm, and 10.6 μm, respectively, generating a ponderomotive potential with a short period (about 5 μm). The electron beam had an energy of 1-1.3 keV, corresponding to a velocity in resonance with the ponderomotive potential created by the laser beams. A decelerating axial electric field of 62 V/m was applied in the interaction region. Trapped or quasi-trapped electrons were not fully decelerated by the axial field, allowing energy differentiation between these and the untrapped electrons. Trapping efficiencies of up to 25% were measured, and the laser-induced increase in energy (nondeceleration) ranged between 0 and 5 eV. The measured laser to electron energy transfer resonance curve may be explained by either multimode quasi-trapping or by the phase displacement energy transfer and energy spread processes.

Original languageEnglish
Pages (from-to)244-253
Number of pages10
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume250
Issue number1-2
DOIs
StatePublished - 1 Sep 1986

Funding

FundersFunder number
Air Force Office of Scientific Research82-0239
U.S. Air Force

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