Oxford Centre for High Energy Density Science (OxCHEDS): publications

Proton probe imaging of fields within a laser-generated plasma channel

IEEE Transactions on Plasma Science 39:11 PART 1 (2011) 2616-2617

Authors:

L Willingale, PM Nilson, AGR Thomas, J Cobble, RS Craxton, A Maksimchuk, PA Norreys, TC Sangster, RHH Scott, C Stoeckl, C Zulick, K Krushelnick

Abstract:

The proton probing technique is used to image quasi-static electromagnetic fields present in the wake of a high-intensity short-pulse laser propagating through an underdense plasma. Bubblelike field structures form along the channel filaments and expand in time. © 2006 IEEE.

Proton radiography of intense-laser-irradiated wire-attached cone targets

IEEE Transactions on Plasma Science 39:11 PART 1 (2011) 2822-2823

Authors:

T Yabuuchi, H Sawada, T Bartal, D Batani, LA Gizzi, MH Key, AJ MacKinnon, HS McLean, PA Norreys, PK Patel, RB Stephens, C Spindloe, W Theobald, MS Wei, FN Beg

Abstract:

Measurements of extreme electrostatic and magnetic fields are of interest for the study of high-energy-density plasmas. Results of proton deflectometry of cone-wire targets that are of interest to fast-ignition inertial confinement fusion are presented. © 2006 IEEE.

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

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.

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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