Oxford Centre for High Energy Density Science (OxCHEDS)

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Gigabar material properties experiments on nif and omega

AIP Conference Proceedings AIP Publishing 1426:1 (2012) 477-480

Authors:

Damian Swift, James Hawreliak, David Braun, Andrea Kritcher, Siegfried Glenzer, GW Collins, Stephen Rothman, David Chapman, Steven Rose

Probing dynamic material strength using in situ x-ray diffraction

AIP Conference Proceedings AIP Publishing 1426:1 (2012) 975-978

Authors:

James Hawreliak, Bassem El-dasher, Jon Eggert, JR Rygg, GW Collins, Hector Lorenzana, Giles Kimminau, Andrew Higginbotham, Bob Nagler, Sam Vinko, William Murphy, Thomas Whitcher, Stephen Rothman, Nigel Park, Justin Wark

Quasi-phase-matching high harmonic generation using trains of pulses produced using an array of birefringent plates.

Opt Express 20:6 (2012) 6236-6247

Authors:

Kevin O'Keeffe, Tom Robinson, Simon M Hooker

Abstract:

Quasi-phase-matched high harmonic generation using trains of up to 8 counter-propagating pulses is explored. For trains of up to 4 pulses the measured enhancement of the harmonic signal scales with the number of pulses N as (N + 1)?, as expected. However, for trains with N > 4, no further enhancement of the harmonic signal is observed. This effect is ascribed to changes of the coherence length Lc within the generating medium. Techniques for overcoming the variation of Lc are discussed. The pressure dependence of quasi-phase-matching is investigated and the switch from true-phase-matching to quasi-phase-matching is observed.

26pYC-8 レーザー生成非一様プラブマ中の衝撃波による磁場増幅(26pYC 領域2,宇宙線?宇宙物理領域,領域11合同招待講演 プラズマ宇宙物理?プラズマ基礎(流体?衝撃波?リコネクション),領域2(プラズマ基礎?プラズマ科学?核融合プラズマ?プラズマ宇宙物理))

(2012) 276

Authors:

蔵満 康浩, 坂和 洋一, 森田 太智, 井出 尭夫, 西尾 健斗, CD Gregory, JN Waugh, N Booth, R Heathcote, C Murphy, G Gregori, J Smallcombe, C Barton, A Diziere, M Koenig, N Woolsey, 佐野 孝好, 高部 英明

Self-consistent measurement of the equation of state of liquid deuterium

High Energy Density Physics 8:1 (2012) 76-80

Authors:

K Falk, SP Regan, J Vorberger, MA Barrios, TR Boehly, DE Fratanduono, SH Glenzer, DG Hicks, SX Hu, CD Murphy, PB Radha, S Rothman, AP Jephcoat, JS Wark, DO Gericke, G Gregori

Abstract:

We combine experiments and theoretical models to characterize warm dense deuterium. A shockwave was driven in a planar target by the OMEGA laser without a standard pusher making the analysis independent of a quartz or aluminium pressure standard. The conditions of the shocked material were diagnosed with VISAR and optical pyrometry which yields the shock velocity (16.9 ± 0.9 km/s) and the temperature (0.57 ± 0.05 eV). We find a self-consistent description of the data when using ab initio simulations (DFT-MD), but not for other equation of state (EOS) models tested. ? 2011 Elsevier B.V.