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Park, J. H.

Paper Title Page
TUPMN055 First Principle Measurements of Thermal Emittance for Copper and Magnesium 1049
  • D. Xiang, Y.-C. Du, W.-H. Huang, R. K. Li, Y. Lin, C.-X. Tang, L. X. Yan
    TUB, Beijing
  • J. H. Park, S. J. Park
    PAL, Pohang, Kyungbuk
  Funding: This work was supported by the Chinese National Foundation of Natural Sciences under Contract no. 10645002.

There are growing interests in generation, preservation and applications of high brightness electron beam. With the rapid development in the techniques for emittance compensation and laser shaping, we are approaching the limit-the uncorrelated thermal emittance. In this paper, we report the measurements of thermal emittance for Cu and Mg. The measurement is conducted in a field-free region. The energy spectrum and angular distribution of the electrons are measured immediately after its emission and further used to reconstruct the initial phase space and the corresponding thermal emittance. We also show how cathode surface roughness* and laser incidence angle as well as its polarization state** affect the quantum efficiency and thermal emittance.

*X. Z. He, High energy physics and nuclear physics,28(2004)1007.**Dao Xiang,et al, NIM A,562(2006)48.

TUPMN064 Experimental Approaches for the Beam Dynamics Study in the PC RF Gun at the PAL 1070
  • J. H. Park, J. Y. Huang, C. Kim, I. S. Ko, Y. W. Parc, S. J. Park
    PAL, Pohang, Kyungbuk
  • D. Xiang
    TUB, Beijing
  Funding: This work is supported in parts by the Center for High Energy Physics at the KNU and the Grant No. R01-2006-000-11309-0 from the Basic Research Program of the Korea Science and Engineering Foundation.

A high-brightness electron beam is emitted from a photo-cathode (PC) RF gun for use in the FIR (Far Infrared) facility being built at the Pohang Accelerator Laboratory (PAL). The beam dynamics study for the PAL XFEL injector is essencial to generate low emittance electron beam from the PC RF gun. The XFEL injector requires 1 nC beam with short bunch length and low emittance. This conditions are simulated with PARMELA code and then are realized on experimental conditions. The experimental conditions for the XFEL injector are measured with beam diagnostic devices such as ICT and Faraday cup for charge measurement, a spectrometer for beam energy measurement. In this article, we present the experimental approaches of the beam dynamics study for the XFEL injector.

wpjho@postech.ac.kr (Jangho Park)