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WG403 Laser System of Photocathode RF Gun in Pohang Accelerator Laboratory laser, electron, gun, optics 42
 
  • C. Kim, J. Choi, J. Y. Huang, I. S. Ko, Y. W. Parc, J. H. Park, S. J. Park
    PAL, Pohang, Kyungbuk
  Funding: Work supported by the Ministry of Science and Technology (MOST), Korea.

A photocathode RF gun have been installed in a photo-injector test facility for the PAL XFEL in the Pohang Accelerator Laboratory. The photocathode RF gun will provide electron bunches which have high charge (1 nC), short bunch length (10 ps). For this purpose, a new laser system was installed and it can provide laser pulses of 2 mJ energy, 110 fs pulse width at 800 nm wavelength. A triple harmonic generator and Ultraviolet (UV) stretcher system were added to generate UV laser pulses with controllable pulse widths which can be increased up to 10 ps. In this article, we introduce our laser system and report recent progress of electron beam generations under the various laser conditions.

 
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WG422 Proposal of a Photocathode Impulse-Gun and Followed by Impulse Accelerating Structures to Produce Low Emittance Electron Beam emittance, electron, space-charge, laser 45
 
  • Y. Kawashima
    JASRI/SPring-8, Hyogo-ken
  The photocathode impulse-gun must be one of the best methods to produce low emittance electron beam for FEL. To raise the beam energy up to around 10 MeV, RF cavity will be used. However, there is drift space between the photocathode impulse-gun and RF cavity. The beam emittace will get worse due to space charge effect in passing through the drift space. Thus the drift space should be as shorter as possible. Minimizing the space charge effect is essential for the early stage of beam acceleration at an electron beam source and a following pre-acceleration. Mechanically unavoidable drift space degrades the beam emittance drastically. We propose a combined structure of a photocathode impulse-gun followed by an impulse accelerator.  
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