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| TUPPH024 |
Review of Manipulation Laser Technology on 3D-Pulse-Shape & Polarization for the Conventional Photocathode RF Gun and the Future Z-polarization Schottky Emission Gun
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289 |
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- H. Tomizawa, H. Dewa, H. Hanaki, A. Mizuno, T. Taniuchi
JASRI/SPring-8, Hyogo-ken
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I developed an adaptive 3D shaping UV-pulse laser system for an RF gun. To suppress emittance growth due to space charge effect, the 3D shape of the laser pulse is optimized as spatially top-hat and temporally a smooth square macro pulse stacked with chirpedμpulses. I applied a deformable mirror that automatically shapes the spatial profile with a feedback routine, based on a genetic algorithm, and a pulse stacker consisting of three birefringence crystal rods for temporal shaping at the same time. The homogeneity of temporal stacking is automatically maximized with a feedback routine between AOPDF UV-pulse measurement and DAZZLER as aμchirped pulse shaper. I proposed a hollow normal incidence as the third incidence method to suppress asymmetrical wake field effect. I developed the optical elements for a new hollow laser incidence with an axicon final focusing. In 2006, I propose a laser-induced Schottky-effect-gated photocathode gun using Z-polarization of the laser on the cathode. I am applying the hollow laser incidence after a radial polarizer with a convex lens focusing. This concept of laser-induced Schottky emission can be applied to photocathode RF and DC guns.
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