Proton radiography of laser-driven imploding target in cylindrical geometry
- Universita degli Studi di Milano-Bicocca, Piazza della scienza 3, Milano 20126 (Italy)
- CELIA, Universite de Bordeaux, CNRS, CEA, F33405 (France)
- Universita degli Studi di Milano, Dipartimento 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)
- INO-CNR, Via G. Moruzzi, 1-56124, Pisa (Italy)
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 {approx}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.
- OSTI ID:
- 21532180
- Journal Information:
- Physics of Plasmas, Vol. 18, Issue 1; Other Information: DOI: 10.1063/1.3530596; (c) 2011 American Institute of Physics; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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