Oxford Centre for High Energy Density Science (OxCHEDS)

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Fast heating of super-solid density plasmas towards laser fusion ignition

Plasma Physics and Controlled Fusion 44:12 B SPEC (2002)

Authors:

R Kodama, KA Tanaka, S Fujioka, H Fujita, H Habara, Y Izawa, T Jitsuno, Y Kitagawa, K Krushelnick, K Mima, N Miyanaga, K Nagai, P Norreys, T Norimatsu, K Shigemori, H Shiraga, Y Toyama, M Zepf, T Yamanaka

Abstract:

We have studied fast heating of highly compressed plasmas using multi 100 TW laser light. Efficient propagation of the ultra-intense laser light and heating of the imploded plasmas were realized with a cone-attached shell target. Energy deposition rate of the ultra-intense laser pulse into high-density plasmas was evaluated from neutron measurements. Generation and propagation property of energetic electrons in the ultra-intense laser interactions were also investigated with solid density targets. About 40% of the laser energy converted to mega electron volts energetic electrons in the interactions with solid targets at intensities of 1019W cm-2. These electrons propagated in the high-density plasmas with a divergence of 20-30° or jet-like collimation. Taking account of these experimental results, heating laser spot size is optimized for laser fusion ignition with a simple estimation.
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Picosecond X-Ray Diffraction Studies of Shocked Crystals

Institute of Electrical and Electronics Engineers (IEEE) (2002) 299-300

Authors:

JS Wark, A Allen, A Loveridge-Smith, J Belak, D Kalantar, RW Lee, S Pollaine, B Remmgton, S Weber, T Boehly, A Hauer, B Holian, G Kyrala, P Lomdahl, D Paisley, DC Swift, MA Meyers
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Picosecond X-Ray Diffraction Studies of Shocked Crystals

Institute of Electrical and Electronics Engineers (IEEE) (2002) 115

Authors:

JS Wark, A Allen, A Loveridge-Smith, J Belak, D Kalantar, RW Lee, S Pollaine, B Remington, S Weber, Lawrence Livermore, T Boehly, A Hauer, B Holian, G Kyrala, P Lomdahl, D Paisley, DC Swift, MA Meyers
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Recreating planetary cores in the laboratory

Institute of Electrical and Electronics Engineers (IEEE) (2002) 206

Authors:

GW Collins, PM Celliers, D Hicks, D Bradley, J Eggert, J Kane, SJ Moon, R Cauble, B Hammel, W Hsing, M Koenig, A Benuzzi, G Huser, E Henry, D Batani, J Pasley, O Willi, P Loubeyre, R Jeanloz, KM Lee, LR Benedetti, D Neely, M Notley, C Danson
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Simulations of a hydrogen-filled capillary discharge waveguide

Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics 65:1 (2002)

Authors:

NA Bobrova, AA Esaulov, JI Sakai, PV Sasorov, DJ Spence, A Butler, SM Hooker, SV Bulanov

Abstract:

A one-dimensional dissipative magnetohydrodynamics code is used to investigate the discharge dynamics of a waveguide for high-intensity laser pulses: the gas-filled capillary discharge waveguide. Simulations are performed for the conditions of a recent experimental measurement of the electron density profile in hydrogen-filled capillaries [D. J. Spence et al., Phys. Rev. E 63, 015401 (R) (2001)], and are found to be in good agreement with those results. The evolution of the discharge in this device is found to be substantially different to that found in Z-pinch capillary discharges, owing to the fact that the plasma pressure is always much higher than the magnetic pressure. Three stages of the capillary discharge are identified. During the last of these the distribution of plasma inside the capillary is determined by the balance between ohmic heating, and cooling due to electron heat conduction. A simple analytical model of the discharge during the final stage is presented, and shown to be in good agreement with the magnetohydrodynamic simulations. © 2001 The American Physical Society.
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