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Dewald, E L; Milovich, J L; Michel, P; Landen, O L; Kline, J L; Glenn, S; Jones, O; Kalantar, D H; Pak, A; Robey, H F; Kyrala, G A; Divol, L; Benedetti, L R; Holder, J; Widmann, K; Moore, A; Schneider, M B; Döppner, T; Tommasini, R; Bradley, D K; Bell, P; Ehrlich, B; Thomas, C A; Shaw, M; Widmayer, C; Callahan, D A; Meezan, N B; Town, R P J; Hamza, A; Dzenitis, B; Nikroo, A; Moreno, K; Van Wonterghem, B; Mackinnon, A J; Glenzer, S H; MacGowan, B J; Kilkenny, J D; Edwards, M J; Atherton, L J; Moses, E I
Physical review letters, 2013-Dec-06, Letnik: 111, Številka: 23Journal Article
On the National Ignition Facility, the hohlraum-driven implosion symmetry is tuned using cross-beam energy transfer (CBET) during peak power, which is controlled by applying a wavelength separation between cones of laser beams. In this Letter, we present early-time measurements of the instantaneous soft x-ray drive at the capsule using reemission spheres, which show that this wavelength separation also leads to significant CBET during the first shock, even though the laser intensities are 30× smaller than during the peak. We demonstrate that the resulting early drive P2/P0 asymmetry can be minimized and tuned to <1% accuracy (well within the ±7.5% requirement for ignition) by varying the relative input powers between different cones of beams. These experiments also provide time-resolved measurements of CBET during the first 2 ns of the laser drive, which are in good agreement with radiation-hydrodynamics calculations including a linear CBET model.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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