Oxford Centre for High Energy Density Science (OxCHEDS)

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Excitation rate coefficients for transitions from the ground level of Gd XXXVII

Journal of Physics B Atomic Molecular and Optical Physics IOP Publishing 35:6 (2002) l127

Authors:

KM Aggarwal, FP Keenan, PH Norrington, GJ Pert, SJ Rose
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Characterization of a gamma-ray source based on a laser-plasma accelerator with applications to radiography

Applied Physics Letters 80:12 (2002) 2129-2131

Authors:

RD Edwards, MA Sinclair, TJ Goldsack, K Krushelnick, FN Beg, EL Clark, AE Dangor, Z Najmudin, M Tatarakis, B Walton, M Zepf, KWD Ledingham, I Spencer, PA Norreys, RJ Clarke, R Kodama, Y Toyama, M Tampo

Abstract:

The application of high intensity laser-produced gamma rays is discussed with regard to picosecond resolution deep-penetration radiography. The spectrum and angular distribution of these gamma rays is measured using an array of thermoluminescent detectors for both an underdense (gas) target and an overdense (solid) target. It is found that the use of an underdense target in a laser plasma accelerator configuration produces a much more intense and directional source. The peak dose is also increased significantly. Radiography is demonstrated in these experiments and the source size is also estimated. © 2002 American Institute of Physics.
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Response to “Comment on ‘Collisionless shock and supernova remnant simulations on VULCAN’ ” [Phys. Plasmas 9, 727 (2002)]

Physics of Plasmas AIP Publishing 9:2 (2002) 729-730

Authors:

NC Woolsey, Y Abou Ali, RG Evans, RAD Grundy, SJ Pestehe, PG Carolan, NJ Conway, RO Dendy, P Helander, KG McClements, JG Kirk, PA Norreys, MM Notley, SJ Rose
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Measuring huge magnetic fields

Nature 415:6869 (2002) 280

Authors:

M Tatarakis, I Watts, FN Beg, EL Clark, AE Dangor, A Gopal, MG Haines, PA Norreys, U Wagner, MS Wei, M Zepf, K Krushelnick
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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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