Oxford Centre for High Energy Density Science (OxCHEDS)

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Fast ignition relevant study of the flux of high intensity laser-generated electrons via a hollow cone into a laser-imploded plasma

Physics of Plasmas 15:2 (2008)

Authors:

MH Key, JC Adam, KU Akli, M Borghesi, MH Chen, RG Evans, RR Freeman, H Habara, SP Hatchett, JM Hill, A Heron, JA King, R Kodama, KL Lancaster, AJ MacKinnon, P Patel, T Phillips, L Romagnani, RA Snavely, R Stephens, C Stoeckl, R Town, Y Toyama, B Zhang, M Zepf, PA Norreys

Abstract:

An integrated experiment relevant to fast ignition. A Cu-doped deuterated polymer spherical shell target with an inserted hollow Au cone is imploded by a six-beam 900-J, 1-ns laser. A 10-ps, 70-J laser pulse is focused into the cone at the time of peak compression. The flux of high-energy electrons through the imploded material is determined from the yield of Cu Kα fluorescence by comparison with a Monte Carlo model. The electrons are estimated to carry about 15% of the laser energy. Collisional and Ohmic heating are modeled, and Ohmic effects are shown to be relatively unimportant. An electron spectrometer shows significantly greater reduction of the transmitted electron flux than is calculated in the model. Enhanced scattering by instability-induced magnetic fields is suggested. An extension of this fluor-based technique to measurement of coupling efficiency to the ignition hot spot in future larger-scale fast ignition experiments is outlined. © 2008 American Institute of Physics.
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Physics: Complexity in fusion plasmas

Science 319:5867 (2008) 1193-1194

Abstract:

Images of imploding fusion plasmas reveal complex electric and magnetic field structures.
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Deformation Substructures and Their Transitions in Laser Shock–Compressed Copper-Aluminum Alloys

Metallurgical and Materials Transactions A Springer Nature 39:2 (2008) 304-321

Authors:

MA Meyers, MS Schneider, H Jarmakani, B Kad, BA Remington, DH Kalantar, J McNaney, B Cao, J Wark
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Effect of laser intensity on fast-electron-beam divergence in solid-density plasmas (Physical Review Letters (2008) 100 (015003))

Physical Review Letters 100:3 (2008)

Authors:

JS Green, VM Ovchinnikov, RG Evans, KU Akli, H Azechi, FN Beg, C Bellei, RR Freeman, H Habara, R Heathcote, MH Key, JA King, KL Lancaster, NC Lopes, T Ma, AJ MacKinnon, K Markey, A McPhee, Z Najmudin, P Nilson, R Onofrei, R Stephens, K Takeda, KA Tanaka, W Theobald, T Tanimoto, J Waugh, L Van Woerkom, NC Woolsey, M Zepf, JR Davies, PA Norreys
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Artificial collimation of fast-electron beams with two laser pulses

Physical Review Letters 100:2 (2008)

Authors:

APL Robinson, M Sherlock, PA Norreys

Abstract:

A scheme for artificially collimating fast-electron beams produced in high intensity (>1019Wcm-2) laser-solid interactions is proposed. The scheme uses a laser pulse at the relativistic threshold (1018Wcm-2) that precedes the high intensity pulse to pregenerate a collimating magnetic field. This concept is supported by analytical calculations and numerical calculations performed using a novel hybrid-Vlasov-Fokker-Planck code called LEDA. This scheme may be highly useful for fast ignition inertial confinement fusion. © 2008 The American Physical Society.
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