Inhibition of crossed-beam energy transfer induced by expansion-velocity fluctuations. (15th February 2018)

• Record Type: Journal Article
• Authors: Neuville, C; Glize, K; Loiseau, P; Masson-Laborde, P-E; Debayle, A; Casanova, M; Baccou, C; Labaune, C; Depierreux, S
• Is Part Of: Plasma physics and controlled fusion. Volume 60:Number 4(2018:Apr.)
• Publication Date: 2018-02-15
• Subjects: laser-plasma interaction -- crossed-beam energy transfer -- expansion-velocity fluctuations -- mitigation of energy transfer -- stimulated Brillouin scattering; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/1361-6587/aaab23
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: Crossed-beam energy transfer between three laser beams has been experimentally investigated in a flowing plasma. Time-evolution measurements of the amplification of a first beam by a second beam highlighted the inhibition of energy transfer by hydrodynamic modifications of the plasma in the crossing volume due to the propagation of a third beam. According to 3D simulations and an analytical model, it appears that the long-wavelength expansion-velocity fluctuations produced by the propagation of the third beam in the crossing volume are responsible for this mitigation of energy transfer. This effect could be a cause of the over-estimation of the amount of the transferred energy in indirect-drive inertial confinement fusion experiments. Besides, tuning such long-wavelength fluctuations could be a way to completely inhibit CBET at the laser entrance holes of hohlraums.