High-Quality Laser-Produced Proton Beam Realized by the Application of a Synchronous RF Electric Field

概要

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A short-pulse (${\sim}210$ fs) high-power (${\sim}1$ TW) laser was focused on a tape target 3 and 5 μm in thickness to a size of $11\times 15$ μm2 with an intensity of $3\times 10^{17}$ W/cm2. Protons produced by this laser with an energy spread of 100% were found to be improved to create peaks in the energy distribution with a spread of ${\sim}7$% by the application of the RF electric field with an amplitude of ${\pm}40$ kV synchronous to the pulsed laser. This scheme combines the conventional RF acceleration technique with laser-produced protons for the first time. It is possible to be operated up to 10 Hz, and is found to have good reproducibility for every laser shot with the capability of adjusting the peak positions by control of the relative phase between the pulsed laser and the RF electric field.
2007-08-25