Crossed-beam energy transfer: polarization effects and evidence of saturation. (5th April 2018)

• Record Type: Journal Article
• 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
• Is Part Of: Plasma physics and controlled fusion. Volume 60:Number 5(2018:May)
• Publication Date: 2018-04-05
• Subjects: crossed-beam energy transfer -- CBET -- stimulated Brillouin scattering -- inertial confinement fusion -- ion acoustic waves; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/1361-6587/aab6d3
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: 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.