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Park, S. J.

Paper Title Page
THPPH045 Electro-Optic Sampling Method Using High DC Voltage Applying Setup 692
 
  • Y. W. Parc, J. Y. Huang, C. Kim, I. S. Ko, J. H. Park, S. J. Park
    PAL, Pohang, Kyungbuk
  • X. Dao
    TUB, Beijing
  
  A RF photo-cathode (RF PC) gun with 1.6 cell cavity is installed at GTS(Gun Test Stand) being built at the Pohang Accelerator Laboratory (PAL). The short, intense, and low emittance electron beams are produced by the RF PC gun. For the successful construction of PAL-XFEL, the timing jitter and bunch length of the beam at the exit of the gun should be measured accurately. EOS (Electro-Optic Sampling) is a very promising method to measure the jitter without any interference with the electron beam. The spatially resolved method will be used in this experiment, which is a single shot measurement using cooled CCD carmera due to very low energy. Before the measurement with the beam at the exit of the gun, the calibration experiment is done with DC high voltage applying setup with 1mm thick ZnTe crystal. The broadening of our laser pulse by the ZnTe crystal is measured with auto-correlation method to know the resolution limit in this experiment and to do data analysis properly. In this presentation, the result of calibration experiment will be presented with a description of the experiment in detail.  
THPPH046 Preliminary Measurement of Emittance Evolution Using Emittance Meter at the PAL 695
 
  • J. H. Park, J. Y. Huang, C. Kim, I. S. Ko, Y. W. Parc, S. J. Park
    PAL, Pohang, Kyungbuk
  • X. Dao
    TUB, Beijing
  • X. J. Wang
    BNL, Upton, Long Island, New York
  
  A high-brightness electron beam is emitted from a RF photocatoode gun with 1.6 cell cavity from October 2005 at the Pohang Accereator Laboratory (PAL). The project of 4th Generation Light Source (4GLS) with the Spontaneous Amplification Sponteneous Emission Free-electron Laser (SASE FEL) in the PAL is called Pohang Accereator Laboratory X-ray Free-electron Laser (PAL-XFEL). In order to success of the PAL-XFEL project, it is necessary to research the high-brightness electron beam at the injector. A emittance meter (E-Meter) is installed for the high-brightness research in GTS (Gun Test Stand). The measurement of transverse emittance and beam size profile along the longitudinal direction was done by the E-Meter. Precise measurement of the emittance profile will provide powerful tool for the commissioning of the 4GLS injectors based on the emittance compensation principle. We are going to achieve this with the use of slit-based E-Meter that can be moved along the longitudinal direction. In this article, we present a preliminary measurement of the emittance evolution with the E-Meter for the commissioning of the RF photocathode gun.