Oxford Centre for High Energy Density Science (OxCHEDS)

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Direct observation of the alpha-epsilon transition in shock-compressed iron via nanosecond x-ray diffraction

Physical Review Letters 95 (2005) 075502 4pp

Authors:

JS Wark, D. H. Kalantar, J. F. Belak, G. W. Collins
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Characterization of a picosecond laser generated 4.5 keV Ti K -alpha source for pulsed radiography

Review of Scientific Instruments 76:7 (2005)

Authors:

JA King, K Akli, RA Snavely, B Zhang, MH Key, CD Chen, M Chen, SP Hatchett, JA Koch, AJ MacKinnon, PK Patel, T Phillips, RPJ Town, RR Freeman, M Borghesi, L Romagnani, M Zepf, T Cowan, R Stephens, KL Lancaster, CD Murphy, P Norreys, C Stoeckl

Abstract:

Kα radiation generated by interaction of an ultrashort (1 ps) laser with thin (25 μm) Ti foils at high intensity (2× 1016 W cm2) is analyzed using data from a spherical Bragg crystal imager and a single hit charge-coupled device spectrometer together with Monte Carlo simulations of Kα brightness. Laser to Kα and electron conversion efficiencies have been determined. We have also measured an effective crystal reflectivity of 3.75±2%. Comparison of imager data with data from the relatively broadband single hit spectrometer has revealed a reduction in crystal collection efficiency for high Kα yield. This is attributed to a shift in the K -shell spectrum due to Ti ionization. © 2005 American Institute of Physics.
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Modeling X-Ray Photoionized Plasmas Produced at the Sandia Z-Facility

Astrophysics and Space Science Springer Nature 298:1-2 (2005) 147-153

Authors:

PAM Van Hoof, ME Foord, RF Heeter, JE Bailey, H-K Chung, ME Cuneo, WH Goldstein, V Jonauskas, FP Keenan, R Kisielius, DA Liedahl, C Ramsbottom, SJ Rose, PT Springer, RS Thoe
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X-Ray Line Transfer in Plasmas with Large Velocity Gradients

Astrophysics and Space Science Springer Nature 298:1-2 (2005) 171-176

Authors:

FM Kerr, A Gouveia, RW Lee, PK Patel, O Renner, SJ Rose, HA Scott, JS Wark
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Beam instabilities in laser-plasma interaction: Relevance to preferential ion heating

Physical Review Letters 94:24 (2005)

Authors:

JT Mendonça, P Norreys, R Bingham, JR Davies

Abstract:

We propose a new mechanism for anomalous ion heating in ultraintense laser plasmas. This mechanism is based on the excitation of an electron two-stream instability that is driven by the fast electron beam that resonantly decays into ion-acoustic waves. These low frequency waves are then strongly damped by the ion collisions in the dense plasma. The model gives a simple explanation for the preferential heating of the bulk ion population observed in recent laser experiments in the petawatt regime. In particular, this work provides an explanation for the different energy loss in the Au and CD plasmas, in cone-guided fast ignition experiments. © 2005 The American Physical Society.
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