Advanced Laser Technologies for High-brightness Photocathode Electron Gun

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  • TOMIZAWA Hiromitsu
    Laser Beamline & Optics Team, Advanced Experimental Facility Group, XFEL Division, JASRI

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  • 高輝度光陰極電子銃を実現する先端レーザ技術
  • コウキド コウインキョク デンシジュウ オ ジツゲン スル センタン レーザ ギジュツ

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Abstract

  A laser-excited photocathode RF gun is one of the most reliable high-brightness electron beam sources for XFELs. Several 3D laser shaping methods have been developed as ideal photocathode illumination sources at SPring-8 since 2001. To suppress the emittance growth caused by nonlinear space-charge forces, the 3D cylindrical UV-pulse was optimized spatially as a flattop and temporally as squarely stacked chirped pulses. This shaping system is a serial combination of a deformable mirror that adaptively shapes the spatial profile with a genetic algorithm and a UV-pulse stacker that consists of four birefringent α-BBO crystal rods for temporal shaping. Using this 3D-shaped pulse, a normalized emittance of 1.4 π mm mrad was obtained in 2006. Utilizing laser's Z-polarization, Schottky-effect-gated photocathode gun was proposed in 2006. The cathode work functions are reduced by a laser-induced Schottky effect. As a result of focusing a radially polarized laser pulse with a hollow lens in vacuum, the Z-field (Z-polarization) is generated at the cathode.<br>

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