Crossed-beam energy transfer: polarization effects and evidence of saturation

Recent results on crossed-beam energy transfer are presented. Wavelength tuning was used to vary the amount of energy transfer between two beams in a quasi-stationary plasma with carefully controlled conditions. The amount of transfer agreed well with calculations assuming linear ion acoustic waves...

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Bibliographic Details
Published in:Plasma physics and controlled fusion 2018-04, Vol.60 (5), p.54017
Main Authors: Turnbull, D, Colaïtis, A, Follett, R K, Palastro, J P, Froula, D H, Michel, P, Goyon, C, Chapman, T, Divol, L, Kemp, G E, Mariscal, D, Patankar, S, Pollock, B B, Ross, J S, Moody, J D, Tubman, E R, Woolsey, N C
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CBET
crossed-beam energy transfer
inertial confinement fusion
ion acoustic waves
stimulated Brillouin scattering
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Summary:Recent results on crossed-beam energy transfer are presented. Wavelength tuning was used to vary the amount of energy transfer between two beams in a quasi-stationary plasma with carefully controlled conditions. The amount of transfer agreed well with calculations assuming linear ion acoustic waves (IAWs) with amplitudes up to δ n n 0.015 . Increasing the initial probe intensity to access larger IAW amplitudes for otherwise fixed conditions yields evidence of saturation. The ability to manipulate a beam's polarization, which results from the anisotropic nature of the interaction, is revisited; an example is provided to demonstrate how polarization effects in a multibeam situation can dramatically enhance the expected amount of energy transfer.
ISSN:0741-3335
1361-6587
DOI:10.1088/1361-6587/aab6d3