Search Results - "Berger, L. R."

High-Performance Indirect-Drive Cryogenic Implosions at High Adiabat on the National Ignition Facility by Baker, K L, Thomas, C A, Casey, D T, Khan, S, Spears, B K, Nora, R, Woods, T, Milovich, J L, Berger, R L, Strozzi, D, Clark, D, Hohenberger, M, Hurricane, O A, Callahan, D A, Landen, O L, Bachmann, B, Benedetti, R, Bionta, R, Celliers, P M, Fittinghoff, D, Goyon, C, Grim, G, Hatarik, R, Izumi, N, Gatu Johnson, M, Kyrala, G, Ma, T, Millot, M, Nagel, S R, Pak, A, Patel, P K, Turnbull, D, Volegov, P L, Yeamans, C

“…To reach the pressures and densities required for ignition, it may be necessary to develop an approach to design that makes it easier for simulations to guide…”
Get full text

Multibeam Stimulated Raman Scattering in Inertial Confinement Fusion Conditions by Michel, P, Divol, L, Dewald, E L, Milovich, J L, Hohenberger, M, Jones, O S, Hopkins, L Berzak, Berger, R L, Kruer, W L, Moody, J D

“…Stimulated Raman scattering from multiple laser beams arranged in a cone sharing a common daughter wave is investigated for inertial confinement fusion (ICF)…”
Get full text

The foot of Homo naledi by Harcourt-Smith, W. E. H., Throckmorton, Z., Congdon, K. A., Zipfel, B., Deane, A. S., Drapeau, M. S. M., Churchill, S. E., Berger, L. R., DeSilva, J. M.

“…Modern humans are characterized by a highly specialized foot that reflects our obligate bipedalism. Our understanding of hominin foot evolution is, although,…”
Get full text

Longitudinal and Transverse Instability of Ion Acoustic Waves by Chapman, T, Berger, R L, Cohen, B I, Banks, J W, Brunner, S

“…Ion acoustic waves are found to be susceptible to at least two distinct decay processes. Which process dominates depends on the parameters. In the cases…”
Get full text

Joule-Level High-Efficiency Energy Transfer to Subpicosecond Laser Pulses by a Plasma-Based Amplifier by Marquès, J.-R., Lancia, L., Gangolf, T., Blecher, M., Bolaños, S., Fuchs, J., Willi, O., Amiranoff, F., Berger, R. L., Chiaramello, M., Weber, S., Riconda, C.

“…Power amplification and pulse compression of short-pulse laser beams by three-wave nonlinear processes in a plasma was proposed by Malkin, Shvets, and Fisch…”
Get full text

Simulating the filamentation of smoothed laser beams with three-dimensional nonlinear dynamics by Babati, L. J., Farmer, W. A., Berger, R. L., Belyaev, M. A., Chapman, T., Hinkel, D. E., Kur, E., Williams, E. A.

“…In a plasma, the ponderomotive force of an inhomogeneous electromagnetic field expels plasma from regions of high intensity. When a laser propagates through a…”
Get full text

Experiments and multiscale simulations of laser propagation through ignition-scale plasmas by Glenzer, S. H, Froula, D. H, Divol, L, Dorr, M, Berger, R. L, Dixit, S, Hammel, B. A, Haynam, C, Hittinger, J. A, Holder, J. P, Jones, O. S, Kalantar, D. H, Landen, O. L, Langdon, A. B, Langer, S, MacGowan, B. J, Mackinnon, A. J, Meezan, N, Moses, E. I, Niemann, C, Still, C. H, Suter, L. J, Wallace, R. J, Williams, E. A, Young, B. K. F

“…With the next generation of high-power laser facilities for inertial fusion coming online, ensuring laser beam propagation through centimetre-scale plasmas is…”
Get full text

Observation of the density threshold behavior for the onset of stimulated Raman scattering in high-temperature hohlraum plasmas by Froula, D H, Divol, L, London, R A, Berger, R L, Döppner, T, Meezan, N B, Ross, J S, Suter, L J, Sorce, C, Glenzer, S H

“…We show that the measured stimulated Raman scattering (SRS) in a large-scale high-temperature plasma scales strongly with the plasma density, increasing by an…”
Get full text

Simulating time-dependent energy transfer between crossed laser beams in an expanding plasma by Hittinger, J.A.F., Dorr, M.R., Berger, R.L., Williams, E.A.

“…A coupled mode system is derived to investigate a three-wave parametric instability leading to energy transfer between co-propagating laser beams crossing in a…”
Get full text

Kinetic theory and Vlasov simulation of nonlinear ion-acoustic waves in multi-ion species plasmas by Chapman, T, Berger, R L, Brunner, S, Williams, E A

“…The theory of damping and nonlinear frequency shifts from particles resonant with ion-acoustic waves (IAWs) is presented for multi-ion species plasma and…”
Get full text

Body proportions in Australopithecus afarensis and A. africanus and the origin of the genus Homo by MCHENRY, H. M, BERGER, L. R

“…New discoveries of A. africanus fossils from Member 4 Sterkfontein reveal a body form quite unlike earlier Australopithecus species. The new adult material…”
Get full text

Leopards as Taphonomic Agents in Dolomitic Caves—Implications for Bone Accumulations in the Hominid-bearing Deposits of South Africa by de Ruiter, Darryl J, Berger, Lee R

“…It has been hypothesised that leopards were significant contributors to the bone accumulations of the Plio-Pleistocene hominid-bearing caves of South Africa…”
Get full text

Multistep redirection by cross-beam power transfer of ultrahigh-power lasers in a plasma by Moody, J. D., Michel, P., Divol, L., Berger, R. L., Bond, E., Bradley, D. K., Callahan, D. A., Dewald, E. L., Dixit, S., Edwards, M. J., Glenn, S., Hamza, A., Haynam, C., Hinkel, D. E., Izumi, N., Jones, O., Kilkenny, J. D., Kirkwood, R. K., Kline, J. L., Kruer, W. L., Kyrala, G. A., Landen, O. L., LePape, S., Lindl, J. D., MacGowan, B. J., Meezan, N. B., Nikroo, A., Rosen, M. D., Schneider, M. B., Strozzi, D. J., Suter, L. J., Thomas, C. A., Town, R. P. J., Widmann, K., Williams, E. A., Atherton, L. J., Glenzer, S. H., Moses, E. I.

“…Laser redirection by cross-beam power transfer in a plasma is an important example of a nonlinear optics process which uses laser–plasma instabilities to one’s…”
Get full text

Late Australopiths and the Emergence of Homo by de Ruiter, Darryl J, Churchill, S.E, Hawks, J, Berger, L.R

“…New fossil discoveries and new analyses increasingly blur the lines between Australopithecus and Homo , changing scientific ideas about the transition between…”
Get full text

Kinetic simulations of the self-focusing and dissipation of finite-width electron plasma waves by Winjum, B J, Berger, R L, Chapman, T, Banks, J W, Brunner, S

“…Two-dimensional simulations, both Vlasov and particle-in-cell, are presented that show the evolution of the field and electron distribution of finite-width,…”
Get full text

Examining criteria for identifying and differentiating fossil faunal assemblages accumulated by hyenas and hominins using extant hyenid accumulations by Kuhn, B. F., Berger, L. R., Skinner, J. D.

“…Numerous authors have put forth criteria for distinguishing between assemblages collected by hyenas and hominins. Of the seven most recognised criteria used to…”
Get full text

Linearized Coulomb Collision Operator for Simulation of Interpenetrating Plasma Streams by Dimits, A. M., Joseph, I., Banks, J. W., Berger, R. L., Brunner, S., Chapman, T., Copeland, D., Ghosh, D., Arrighi, W. J., Hittinger, J.

“…We present an extension of a linearized Coulomb collision operator, previously used in several Eulerian kinetic codes for like-species collisions and…”
Get full text

Comment on “Deliberate body disposal by hominins in the Dinaledi Chamber, Cradle of Humankind, South Africa?” [J. Hum. Evol. 96 (2016) 145–148] by Dirks, P.H.G.M., Berger, L.R., Hawks, J., Randolph-Quinney, P.S., Backwell, L.R., Roberts, E.M.

Get full text

Stochastic ion heating from many overlapping laser beams in fusion plasmas by Michel, P, Rozmus, W, Williams, E A, Divol, L, Berger, R L, Town, R P J, Glenzer, S H, Callahan, D A

“…In this Letter, we show through numerical simulations and analytical results that overlapping multiple (N) laser beams in plasmas can lead to strong stochastic…”
Get full text

Backscatter reduction using combined spatial, temporal, and polarization beam smoothing in a long-scale-length laser plasma by Moody, J D, MacGowan, B J, Rothenberg, J E, Berger, R L, Divol, L, Glenzer, S H, Kirkwood, R K, Williams, E A, Young, P E

“…Spatial, temporal, and polarization smoothing schemes are combined for the first time to reduce to a few percent the total stimulated backscatter of a NIF-like…”
Get full text