Oxford Centre for High Energy Density Science (OxCHEDS)

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High brightness keV harmonics from relativistically oscillating plasma surfaces

European Physical Journal: Special Topics 175:1 (2009) 57-60

Authors:

B Dromey, D Adams, S Kar, C Bellei, DC Carroll, RJ Clarke, JS Green, S Kneip, K Markey, SR Nagel, PT Simpson, L Willingale, P McKenna, D Neely, Z Najmudin, K Krushelnick, PA Norreys, M Zepf

Abstract:

X-ray harmonic radiation extending to 3.3 Å, 3.8 keV from Petawatt class laser-solid interactions is presented. The harmonic spectra display a relativistic limit scaling up to ∼3000th order, above which an intensity dependent scaling roll-over is observed. Highly directional beamed emission for harmonic photon energy hv > 1 keV is found to be into a cone angle < 4°, significantly less than that of the incident laser cone (20°). © EDP Sciences and Springer 2009.
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Perspective for high energy density studies on x-ray FELs

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 7451 (2009) 74510e-74510e-7

Authors:

RW Lee, B Nagler, U Zastrau, R Fäustlin, SM Vinko, T Whitcher, R Sobierajski, J Krzywinski, L Juha, AJ Nelson, S Bajt, K Budil, RC Cauble, T Bornath, T Burian, J Chalupsky, H Chapman, J Cihelka, T Döppner, T Dzelzainis, S Düsterer, M Fajardo, E Förster, C Fortmann, SH Glenzer, S Göde, G Gregori, V Hajkova, P Heimann, M Jurek, FY Khattak, AR Khorsand, D Klinger, M Kozlova, T Laarmann, H-J Lee, K-H Meiwes-Broer, P Mercere, WJ Murphy, A Przystawik, R Redmer, H Reinholz, D Riley, G Röpke, K Saksl, R Thiele, J Tiggesbäumker, S Toleikis, T Tschentscher, I Uschmann, RW Falcone, R Shepherd, JB Hastings, WE White, JS Wark
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A dual-channel, curved-crystal spectrograph for petawatt laser, x-ray backlighter source studies

Review of Scientific Instruments AIP Publishing 80:8 (2009) 083501

Authors:

W Theobald, C Stoeckl, PA Jaanimagi, PM Nilson, M Storm, DD Meyerhofer, TC Sangster, D Hey, AJ MacKinnon, H-S Park, PK Patel, R Shepherd, RA Snavely, MH Key, JA King, B Zhang, RB Stephens, KU Akli, K Highbarger, RL Daskalova, L Van Woerkom, RR Freeman, JS Green, G Gregori, K Lancaster, PA Norreys

Abstract:

A dual-channel, curved-crystal spectrograph was designed to measure time-integrated x-ray spectra in the approximately 1.5 to 2 keV range (6.2-8.2 A wavelength) from small-mass, thin-foil targets irradiated by the VULCAN petawatt laser focused up to 4x10(20) W/cm(2). The spectrograph consists of two cylindrically curved potassium-acid-phthalate crystals bent in the meridional plane to increase the spectral range by a factor of approximately 10 compared to a flat crystal. The device acquires single-shot x-ray spectra with good signal-to-background ratios in the hard x-ray background environment of petawatt laser-plasma interactions. The peak spectral energies of the aluminum He(alpha) and Ly(alpha) resonance lines were approximately 1.8 and approximately 1.0 mJ/eV sr (approximately 0.4 and 0.25 J/A sr), respectively, for 220 J, 10 ps laser irradiation.
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Laser-driven particle acceleration

Nature Photonics 3:8 (2009) 423-425
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Ion structure in dense plasmas: MSA versus HNC

Journal of Physics A: Mathematical and Theoretical 42:21 (2009)

Authors:

K Wünsch, J Vorberger, G Gregori, DO Gericke

Abstract:

We present results for the ionic structure in dense, moderately to strongly coupled plasmas using two models: the mean spherical approximation (MSA) and the hypernetted chain (HNC) approach. While the first method allows for an analytical solution, the latter has to be solved iteratively. Independent of the coupling strength, the results show only small differences when the ions are considered to form an unscreened one-component plasma (OCP) system. If the electrons are treated as a polarizable background, the different ways to incorporate the screening yield, however, large discrepancies between the models, particularly for more strongly coupled plasmas. © 2009 IOP Publishing Ltd.
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