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Fourkal Eugene S , Veltchev Lavor , Ma Chang Ming
Laser-accelerated ion beam and target design
. 2006 12/22/05 :40pp
PMID: AN 2006:817297   
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Abstract
Methods for designing a laser-accelerated ion beam are described which entail modeling a system including a heavy ion layer, an elec. field, and high energy light pos. ions having an energy distribution comprising a max. light pos. ion energy; correlating phys. parameters of the heavy ion layer, the elec. field, and the max. light pos. ion energy using the model; and varying the parameters of the heavy ion layer to optimize the energy distribution of the high energy light pos. ions. One method includes analyzing the acceleration of light pos. ions, for example protons, through interaction of a high-power laser pulse with a double-layer target using two-dimensional particle-in-cell (PIC) simulations and a one-dimensional anal. model. The max. energy acquired by the accelerated light pos. ions, e.g., protons, in this model depends on the phys. characteristics of the heavy-ion layer-the electron-ion mass ratio and effective charge state of the ions. The hydrodynamic equations for both electron and heavy ion species solved and the test-particle approxn. for the protons is applied. It was found that the heavy ion motion modifies the longitudinal elec. field distribution, thus changing the acceleration conditions for the light pos. ions. Methods for designing a target used for generating laser-accelerated ion beams are also described which entail modeling a system including a target, an elec. field, and high energy light pos. ions having an energy distribution comprising a max. light pos. ion energy, the target comprising a heavy ion layer characterized by a structural parameter , and varying the structural parameter to optimize the energy distribution of the high energy light pos. ions. The heavy ion layer may comprise carbon, a metal, or any combination of metals. The high energy light pos. ions may be produced from a layer of light pos. ion rich material (e.g., water, hydrocarbons, noble gases, inorg. materials, or polymers). The max. light pos. ion energy is in the 50-250 MeV range. Targets produced by the methods are also described. Application to isotope prodn. for medical diagnosis and hadron therapy is indicated. [on SciFinder (R)]
Notes
CAN 145:237079 71-1 Nuclear Technology Patent written in English. 20060817 1333-74-0 (Hydrogen); 7439-93-2 (Lithium); 7440-01-9 (Neon); 7440-05-3 (Palladium); 7440-06-4 (Platinum); 7440-22-4 (Silver); 7440-37-1 (Argon); 7440-41-7 (Beryllium); 7440-42-8 (Boron); 7440-44-0 (Carbon); 7440-50-8 (Copper); 7440-57-5 (Gold); 7440-59-7 (Helium); 7727-37-9 (Nitrogen); 7732-18-5 (Water); 7782-41-4 (Fluorine); 7782-44-7 (Oxygen) Role: DEV (Device component use), PEP (Physical, engineering or chemical process), PYP (Physical process), PROC (Process), USES (Uses) (laser-accelerated ion beam design and design of targets for producing the ion beams and the targets); 12586-59-3 (Proton) Role: NUU (Other use, unclassified), PEP (Physical, engineering or chemical process), PYP (Physical process), PROC (Process), USES (Uses) (laser-accelerated ion beam design and design of targets for producing the ion beams and the targets) A2 US 2004-638821 20041222