Oxford Centre for High Energy Density Science (OxCHEDS)

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Coherent Phonon Spectroscopy using Time-Resolved X-ray Diffraction

Institute of Electrical and Electronics Engineers (IEEE) (2001) 115-116

Authors:

AM Lindenberg, I Kang, SL Johnson, RW Falcone, PA Heimann, T Missalla, Z Chang, RW Lee, JS Wark
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Femtosecond X-ray diffraction: Experiments and limits

Proceedings of SPIE - The International Society for Optical Engineering 4143 (2001) 26-37

Authors:

JS Wark, AM Allen, PC Ansbro, PH Bucksbaum, Z Chang, M DeCamp, RW Falcone, PA Heimann, SL Johnson, I Kang, HC Kapteyn, RW Lee, R Merlin, G Naylor, HA Padmore, DA Reis, A Sjoegren, M Wulff

Abstract:

Although the realisation of femtosecond X-ray free electron laser (FEL) X-ray pulses is still some time away, X-ray diffraction experiments within the sub-picosecond domain are already being performed using both synchrotron and laser-plasma based X-ray sources. Within this paper we summarise the current status of some of these experiments which, to date, have mainly concentrated on observing non-thermal melt and coherent phonons in laser-irradiated semiconductors. Furthermore, with the advent of FEL sources, X-ray pulse lengths may soon be sufficiently short that the finite response time of monochromators may themselves place fundamental limits on achievable temporal resolution. A brief review of time-dependent X-ray diffraction relevant to such effects is presented.
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Investigation of a hydrogen plasma waveguide

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 63:1 II (2001) 1-4

Authors:

DJ Spence, SM Hooker

Abstract:

A hydrogen plasma waveguide for high-intensity laser pulses is described. The guiding channel is formed by a small-scale discharge in a hydrogen-filled capillary. The measured lifetime of the capillary is inferred to be greater than 106 shots. The results of interferometric measurements of the electron density in the capillary are presented. The guiding channel is found to be highly ionized with an axial electron density of 2.7 ×1018 cm-3, and parabolic, the curvature corresponding to a matched spot-size of 37.5 μm. ©2000 The American Physical Society.
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Investigation of a novel hydrogen plasma waveguide for high-intensity laser pulses

Optics InfoBase Conference Papers (2001)

Authors:

DJ Spence, A Butler, SM Hooker

Abstract:

We present measurements of the electron density profile in the guiding channel of a novel plasma waveguide. The results of experiments to demonstrate guiding at peak intensities of >10−17 W cm−2 will be presented.

Production of radioactive nuclides by energetic protons generated from intense laser-plasma interactions

Applied Physics Letters 78:1 (2001) 19-21

Authors:

MIK Santala, M Zepf, FN Beg, EL Clark, AE Dangor, K Krushelnick, M Tatarakis, I Watts, KWD Ledingham, T McCanny, I Spencer, AC Machacek, R Allott, RJ Clarke, PA Norreys

Abstract:

Nuclear activation has been observed in materials exposed to the ablated plasma generated from high intensity laser-solid interactions (at focused intensities up to 2 × 1019 W/cm2) and is produced by protons having energies up to 30 MeV. The energy spectrum of the protons is determined from these activation measurements and is found to be consistent with other ion diagnostics. The possible development of this technique for "table-top" production of radionuclides for medical applications is also discussed.
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