Oxford Centre for High Energy Density Science (OxCHEDS)

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Focused intensities of 1020 Wcm-2 with the upgraded Vulcan CPA interaction facility

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 3492 (1999) 82-93

Authors:

Colin N Danson, Ric M Allott, S Angood, G Booth, JL Collier, AR Damerell, Christopher B Edwards, PS Flintoff, J Govans, S Hancock, P Hatton, SJ Hawkes, MHR Hutchinson, Michael H Key, C Hernandez-Gomez, John Leach, W Lester, David Neely, Peter A Norreys, MM Notley, David A Pepler, CJ Reason, DA Rodkiss, Ian N Ross, WT Toner, M Trentelman, JA Walczak, RA Wellstood, TB Winstone, RWW Wyatt, BE Wyborn
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Measurement of the electron-density profile in a discharge-ablated capillary waveguide

Optics Letters 24:14 (1999) 993-995

Authors:

DJ Spence, PDS Burnett, SM Hooker

Abstract:

Discharged-ablated capillary waveguides were investigated based on electron-density profile using time-resolved interferometric measurements. A pronounced axial minimum with a relative depth of as much as 60% of the axial electron density was developed in the electron density profile. Results showed that this profile can be used for high-intensity laser pulse tunneling.
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A spectroscopic analysis of near solid density plasmas

Laser and Particle Beams Cambridge University Press (CUP) 17:3 (1999) 477-485

Authors:

R SMITH, GJ TALLENTS, SJ PESTEHE, G HIRST, J LIN, S ROSE, M TAGVIASHVILI
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Fast electron propagation and energy deposition in laser shock compressed plasmas

Laser and Particle Beams Cambridge University Press (CUP) 17:3 (1999) 519-528

Authors:

A BERNARDINELLO, D BATANI, V MASELLA, TA HALL, S ELLWI, M KOENIG, A BENUZZI, J KRISHNAN, F PISANI, A DJAOUI, P NORREYS, D NEELY, S ROSE, MH KEY, P FEWS
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Observation of a highly directional γ-ray beam from ultrashort, ultraintense laser pulse interactions with solids

Physics of Plasmas AIP Publishing 6:5 (1999) 2150-2156

Authors:

PA Norreys, M Santala, E Clark, M Zepf, I Watts, FN Beg, K Krushelnick, M Tatarakis, AE Dangor, X Fang, P Graham, T McCanny, RP Singhal, KWD Ledingham, A Creswell, DCW Sanderson, J Magill, A Machacek, JS Wark, R Allott, B Kennedy, D Neely

Abstract:

Novel measurements of electromagnetic radiation above 10 MeV are presented for ultra intense laser pulse interactions with solids. A bright, highly directional source of γ rays was observed directly behind the target. The γ rays were produced by bremsstrahlung radiation from energetic electrons generated during the interaction. They were measured using the photoneutron reaction [63Cu(γ,n)62Cu] in copper. The resulting activity was measured by coincidence counting the positron annihilation γ rays which were produced from the decay of Cu62. New measurements of the bremsstrahlung radiation at 1019 W cm−2 are also presented.
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