Oxford Centre for High Energy Density Science (OxCHEDS)

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Electron impact excitation of Al XIII: A relativistic approach*

Astronomy & Astrophysics EDP Sciences 432:3 (2005) 1151-1155

Authors:

KM Aggarwal, FP Keenan, SJ Rose
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Vulcan petawatt: Design, operation and interactions at 5 × 1020 Wcm−2

Laser and Particle Beams Cambridge University Press (CUP) 23:1 (2005) 87-93

Authors:

CN DANSON, PA BRUMMITT, RJ CLARKE, JL COLLIER, B FELL, AJ FRACKIEWICZ, S HAWKES, C HERNANDEZ-GOMEZ, P HOLLIGAN, MHR HUTCHINSON, A KIDD, WJ LESTER, IO MUSGRAVE, D NEELY, DR NEVILLE, PA NORREYS, DA PEPLER, CJ REASON, W SHAIKH, TB WINSTONE, RWW WYATT, BE WYBORN
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Pseudoresonant laser wakefield acceleration driven by 10.6-μm laser light

IEEE Transactions on Plasma Science 33:1 I (2005) 3-7

Authors:

WD Kimura, NE Andreev, M Babzien, I Ben-Zvi, DB Cline, CE Dilley, SC Gottschalk, SM Hooker, KP Kusche, SV Kuznetsov, IV Pavlishin, IV Pogorelsky, AA Pogosova, LC Steinhauer, A Ting, V Yakimenko, A Zigler, F Zhou

Abstract:

This paper describes an experiment to demonstrate, for the first time, laser wakefield acceleration (LWFA), driven by 10.6-μm light from a CO2 laser. This experiment is also noteworthy because it will operate in a pseudoresonant LWFA regime, in which the laser-pulse-length is too long for resonant LWFA, but too short for self-modulated LWFA. Nonetheless, high acceleration gradients are still possible. This experiment builds upon an earlier experiment called staged electron laser acceleration (STELLA), where efficient trapping and monoenergetic laser acceleration of electrons were demonstrated using inverse free electron lasers. The aim is to apply the STELLA approach of laser-driven microbunch formation followed by laser-driven trapping and acceleration to LWFA. These capabilities are important for a practical electron linear accelerator based upon LWFA. © 2005 IEEE.
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Dramatic enhancement of xuv laser output using a multimode gas-filled capillary waveguide

Physical Review A - Atomic, Molecular, and Optical Physics 71:1 (2005)

Authors:

T Mocek, CM McKenna, B Cros, S Sebban, DJ Spence, G Maynard, I Bettaibi, V Vorontsov, AJ Gonsavles, SM Hooker

Abstract:

We report a significant increase of the output of a 41.8-nm Xe 8+ laser achieved by means of multimode guiding of high-intensity femtosecond laser pulses in a gas-filled dielectric capillary tube. The optimized lasing signal from a 15-mm-long capillary was nearly an order of magnitude higher than that from a gas cell of the same length. Simulations of the propagation of the pump laser pulse in the capillary confirmed that this enhancement is due to reflections from the capillary wall, which increase the length of the Xe 8+ plasma column generated. The influence of gas pressure and focusing position on the lasing is also presented. © 2005 The American Physical Society.
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Experimental characterization of a strongly coupled solid density plasma generated in a short-pulse laser target interaction

Contributions to Plasma Physics 45:3-4 (2005) 284-292

Authors:

G Gregori, SB Hansen, R Clarke, R Heathcote, MH Key, J King, RI Klein, N Izumi, AJ Mackinnon, SJ Moon, HS Park, J Pasley, N Patel, PK Patel, BA Remington, DD Ryutov, R Shepherd, RA Snavely, SC Wilks, BB Zhang, SH Glenzer

Abstract:

We have measured high resolution copper Kα spectra from a picosecond high intensity laser produced plasma. By fitting the shape of the experimental spectra with a self-consistent-field model which includes all the relevant line shifts from multiply ionized atoms, we are able to infer time and spatially averaged electron temperatures (Te) and ionization state (Z) in the foil. Our results show increasing values for Te and Z when the overall mass of the target is reduced. In particular, we measure temperatures in excess of 200 eV with Z ∼ 13-14. For these conditions the ion-ion coupling constant is Γii ∼ 8-9, thus suggesting the achievement of a strongly coupled plasma regime. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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