Proton radiography of laser-driven imploding target in cylindrical geometry

Year: 2011

Authors: Volpe L., Batani D., Vauzour B., Nicolai Ph., Santos J.J., Regan C., Morace A., Dorchies F., Fourment C., Hulin S., Perez F., Baton S., Lancaster K., Galimberti M., Heathcote R., Tolley M., Spindloe Ch., Koester P., Labate L., Gizzi LA., Benedetti C., Sgattoni A., Richetta M., Pasley J., Beg F., Chawla S., Higginson D.P., MacPhee A.G.

Autors Affiliation: Università degli Studi di Milano-Bicocca, Piazza della scienza 3, Milano 20126, Italy;
INO-CNR, Via G. Moruzzi, 1–56124, Pisa, Italy;
CELIA, Université de Bordeaux, CNRS, CEA, F33405, France;
Università degli Studi di Milano, Dip. di Fisica, via Celoria, 16 1–20133 Milano, Italy;
LULI, Ecole Polytechnique-CNRS-UPMC, 91128 Palaiseau Cedex, France;
RAL, STFC, Harwell Science and Innovation Campus Didcot, OX11 0QX, United Kingdom;
University of Bologna, Via Irnerio 46 Bologna (40126) Italy;
University of Rome “Tor Vergata,” via della Ricerca Scientifica 1, 00133 Roma, Italy;
Department of Physics, University of York, York, YO10 5DD, United Kingdom;
University of California San Diego, La Jolla, California 92093, USA;
LLNL, 7000 East Avenue, Livermore, California 94550, USA

Abstract: An experiment was done at the Rutherford Appleton Laboratory (Vulcan laser petawatt laser) to study fast electron propagation in cylindrically compressed targets, a subject of interest for fast ignition. This was performed in the framework of the experimental road map of HiPER (the European high power laser energy research facility project). In the experiment, protons accelerated by a picosecond-laser pulse were used to radiograph a 220 mu m diameter cylinder (20 mu m wall, filled with low density foam), imploded with similar to 200 J of green laser light in four symmetrically incident beams of pulse length 1 ns. Point projection proton backlighting was used to get the compression history and the stagnation time. Results are also compared to those from hard x-ray radiography. Detailed comparison with two-dimensional numerical hydrosimulations has been done using a Monte Carlo code adapted to describe multiple scattering and plasma effects. Finally we develop a simple analytical model to estimate the performance of proton radiography for given implosion conditions. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3530596]


Volume: 18 (1)      Pages from: 012704  to: 012704

More Information: The authors acknowledge the support of the HiPER project and Preparatory Phase Funding Agencies (EC, MSMT, and STFC) in undertaking this work.
DOI: 10.1063/1.3530596

Citations: 27
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