Oxford Centre for High Energy Density Science (OxCHEDS)

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The 10 PW OPCPA Vulcan Laser Upgrade

CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference (2009)

Authors:

O Chekhlov, J Collier, RJ Clark, C Hernandez-Gomez, A Lyachev, P Matousek, IO Musgrave, D Neely, PA Norreys, I Ross, Y Tang, TB Winstone, BE Wyborn
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Design of a sub 100-femtosecond X-ray Streak Camera

2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum Electronics and Laser Science Conference, CLEO/QELS 2009 (2009)

Authors:

B Li, PP Rajeev, G Gregori, M Benetou, B Dobson, A Cavalleri, L Pickworth, P Lau, P Jaanimagi, F Read, J Lynn, D Neely

Abstract:

The temporal resolution of existing streak cameras are limited by electron transit time dispersion. Here we present a state-of-art design compensating this to achieve a breakthrough of 100fs time resolution. ©2009 IEEE.
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Measurements of radiative shock properties using X-ray Thomson scattering

IEEE International Conference on Plasma Science (2009)

Authors:

A Visco, RP Drake, MJ Grosskopf, SH Glenzer, DH Froula, G Gregori
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Effect of reentrant cone geometry on energy transport in intense laser-plasma interactions

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 80:4 (2009)

Authors:

KL Lancaster, M Sherlock, JS Green, CD Gregory, P Hakel, KU Akli, FN Beg, SN Chen, RR Freeman, H Habara, R Heathcote, DS Hey, K Highbarger, MH Key, R Kodama, K Krushelnick, H Nakamura, M Nakatsutsumi, J Pasley, RB Stephens, M Storm, M Tampo, W Theobald, L Van Woerkom, RL Weber, MS Wei, NC Woolsey, T Yabuuchi, PA Norreys

Abstract:

The energy transport in cone-guided low- Z targets has been studied for laser intensities on target of 2.5× 1020 W cm-2. Extreme ultraviolet (XUV) imaging and transverse optical shadowgraphy of the rear surfaces of slab and cone-slab targets show that the cone geometry strongly influences the observed transport patterns. The XUV intensity showed an average spot size of 65±10 μm for slab targets. The cone slabs showed a reduced spot size of 44±10 μm. The shadowgraphy for the aforementioned shots demonstrate the same behavior. The transverse size of the expansion pattern was 357±32 μm for the slabs and reduced to 210±30 μm. A transport model was constructed which showed that the change in transport pattern is due to suppression of refluxing electrons in the material surrounding the cone. © 2009 The American Physical Society.
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Soft x-ray free electron laser microfocus for exploring matter under extreme conditions.

Opt Express 17:20 (2009) 18271-18278

Authors:

AJ Nelson, S Toleikis, H Chapman, S Bajt, J Krzywinski, J Chalupsky, L Juha, J Cihelka, V Hajkova, L Vysin, T Burian, M Kozlova, RR Fäustlin, B Nagler, SM Vinko, T Whitcher, T Dzelzainis, O Renner, K Saksl, AR Khorsand, PA Heimann, R Sobierajski, D Klinger, M Jurek, J Pelka, B Iwan, J Andreasson, N Timneanu, M Fajardo, JS Wark, D Riley, T Tschentscher, J Hajdu, RW Lee

Abstract:

We have focused a beam (BL3) of FLASH (Free-electron LASer in Hamburg: lambda = 13.5 nm, pulse length 15 fs, pulse energy 10-40 microJ, 5 Hz) using a fine polished off-axis parabola having a focal length of 270 mm and coated with a Mo/Si multilayer with an initial reflectivity of 67% at 13.5 nm. The OAP was mounted and aligned with a picomotor controlled six-axis gimbal. Beam imprints on poly(methyl methacrylate) - PMMA were used to measure focus and the focused beam was used to create isochoric heating of various slab targets. Results show the focal spot has a diameter of < or =1 microm. Observations were correlated with simulations of best focus to provide further relevant information.
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