Oxford Centre for High Energy Density Science (OxCHEDS)

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Gamma‐ray strength functions and their relation to astrophysics

AIP Conference Proceedings AIP Publishing 1377:1 (2011) 239-246

Authors:

AC Larsen, S Goriely, E Algin, U Agvaanluvsan, A Bürger, A Görgen, M Guttormsen, TW Hagen, T Lönnroth, GE Mitchell, HT Nyhus, JB Rekstad, T Renstro̸m, SJ Rose, IE Ruud, A Schiller, S Siem, NUH Syed, HK Toft, GM Tveten, A Voinov, K Wikan, Paraskevi Demetriou, Rauno Julin, Sotirios Harissopulos
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Measuring fast electron distribution functions at intensities up to 10 21 W cm-2

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 653:1 (2011) 137-139

Authors:

N Booth, RJ Clarke, D Doria, LA Gizzi, G Gregori, P Hakel, P Koester, L Labate, T Levato, B Li, M Makita, RC Mancini, J Pasley, PP Rajeev, D Riley, APL Robinson, E Wagenaars, JN Waugh, NC Woolsey

Abstract:

Here we present results from ultra-intense experiments demonstrating the viability of polarization spectroscopy as a diagnostic of the electron return current and spatial anisotropy and distribution function of the fast electron beam. The measurements extend to ultra-relativistic intensities of 10 21 W cm-2, including laserplasma interaction regimes important for fast ignition studies, for example HiPER, and the development of secondary sources from next generation ultra-short pulse, ultra-intense laser facilities such as Astra-Gemini and ELI. As an in situ diagnostic, spectroscopic measurements are vital to understanding fast electron beams, enabling extrapolation of results to define fast ignition inertial confinement fusion and secondary source facilities. © 2011 Elsevier B.V.
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Present states and future prospect of fast ignition realization experiment (FIREX) with Gekko and LFEX Lasers at ILE

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 653:1 (2011) 84-88

Authors:

M Koga, Y Arikawa, H Azechi, Y Fujimoto, S Fujioka, H Habara, Y Hironaka, H Homma, H Hosoda, T Jitsuno, T Johzaki, J Kawanaka, R Kodama, K Mima, N Miyanaga, M Murakami, H Nagatomo, M Nakai, Y Nakata, H Nakamura, H Nishimura, T Norimatsu, Y Sakawa, N Sarukura, K Shigemori, H Shiraga, T Shimizu, H Takabe, M Tanabe, KA Tanaka, T Tanimoto, T Tsubakimoto, T Watari, A Sunahara, M Isobe, A Iwamoto, T Mito, O Motojima, T Ozaki, H Sakagami, T Taguchi, Y Nakao, H Cai, M Key, P Norreys, J Pasley

Abstract:

The fast ignition realization experiment (FIREX) project is progressing. The new short pulse laser system, LFEX laser, has been completely assembled and one of the four beamlets is now in operation. A fast-ignition experiment was performed using this single short pulse combined with the Gekko XII implosion laser. The energy of the GXII implosion laser was about 2 kJ and the pulse width was 1.5 ns. The energy of the LFEX laser was increased upto 800 J and two pulse durations 5 and 1.6 ps were compared. Targets were deuterated plastic shells with gold cones. It was found that the neutron yield was increased by a factor of 30 as a result of the fast electron-induced heating in LFEX 1.6 ps shot. The estimated coupling efficiency between the LFEX laser pulse and the compressed fuel was low (less than 5%). This may be due to pre-plasma formed by light arriving at the target before the main laser pulse. Further investigations and attempts to overcome these problems are now in progress. © 2011 Elsevier B.V.
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High Harmonic Optical Generator (Polarization Beating 1/2)

(2011) UK Patent Application GB1117355.6

Authors:

LZ Liu, K O'Keeffe, SM Hooker

Density fluctuations in the Yukawa one-component plasma: An accurate model for the dynamical structure factor

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 84:4 (2011)

Authors:

JP Mithen, J Daligault, BJB Crowley, G Gregori

Abstract:

Using numerical simulations, we investigate the equilibrium dynamics of a single-component fluid with Yukawa interaction potential. We show that, for a wide range of densities and temperatures, the dynamics of the system are in striking agreement with a simple model of generalized hydrodynamics. Since the Yukawa potential can describe the ion-ion interactions in a plasma, our results have significant applicability for both analyzing and interpreting the results of x-ray scattering data from high-power lasers and fourth-generation light sources. © 2011 American Physical Society.
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