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Development of foam-based layered targets for laser-driven ion beam production
Prencipe, I,Sgattoni, A,Dellasega, D,Fedeli, L,Cialfi, L,Choi, Il Woo,Kim, I Jong,Janulewicz, K A,Kakolee, K F,Lee, Hwang Woon,Sung, Jae Hee,Lee, Seong Ku,Nam, Chang Hee,Passoni, M IOP 2016 Plasma physics and controlled fusion Vol.58 No.3
<P>We report on the development of foam-based double-layer targets (DLTs) for laser-driven ion acceleration. Foam layers with a density of a few mg cm<SUP>−3</SUP> and controlled thickness in the 8–36 <I>μ</I>m range were grown on <I>μ</I>m-thick Al foils by pulsed laser deposition (PLD). The DLTs were experimentally investigated by varying the pulse intensity, laser polarisation and target properties. Comparing DLTs with simple Al foils, we observed a systematic enhancement of the maximum and average energies and number of accelerated ions. Maximum energies up to 30 MeV for protons and 130 MeV for C<SUP>6+</SUP> ions were detected. Dedicated three-dimensional particle-in-cell (3D-PIC) simulations were performed considering both uniform and cluster-assembled foams to interpret the effect of the foam nanostructure on the acceleration process.</P>
Proton Radiography and Fast Electron Propogation Through Cyliderically Compressed Targets
R. Jafer,L. Volpe,D. Batani,M. Koenig,S. Baton,E. Brambrink,F. Perez,K. Lancaster,M. Galimberti,R. Heathcote,M. Tolley,Ch. Spindloe,P. Koester,L. Labate,L. Gizzi,C. Benedetti,A. Sgattoni,M. Richetta,J 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.21
The paper describes the key points contained in the short term HiPER (High Power laser Energy Research) experimental road map, as well as the results of two phases of the experiment performed in “HiPER dedicated time slots. Experimental and theoretical results of relativistic electron transport in cylindrically compressed matter are presented. This experiment was achieved at the VULCAN laser facility (UK) by using four long pulse beams (∽4 × 50 J, 1 ns, at 0.53 µm) to compress a hollow plastic cylinder filled with plastic foam of three different densities (0.1, 0.3, and 1 g cm−3). In the first phase of the experiment, protons accelerated by a picosecond laser pulse were used to radiograph a cylinder filled with 0.1 g/cc foam. Point projection proton backlighting was used to measure the degree of compression as well as the stagnation time. Results were compared to those from hard X-ray radiography. Finally, Monte Carlo simulations of proton propagation in cold and compressed targets allowed a detailed comparison with 2D numerical hydro simulations. 2D simulations predict a density of 2-5 g cm−3 and a plasma temperature up to 100 eV at maximum compression. In the second phase of the experiment, a short pulse (10 ps, 160 J) beam generated fast electrons that propagated through the compressed matter by irradiating a nickel foil at an intensity of 5 × 1018 Wcm−2. X-ray spectrometer and imagers were implemented in order to estimate the compressed plasma conditions and to infer the hot electron characteristics. Results are discussed and compared with simulations.