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Kang, H.-S.

Paper Title Page
MOPP044 Beam Diagnostic System for PAL-XFEL 146
 
  • J.Y. Huang, Y.S. Bae, M.-H. Chun, Y.J. Han, S.-H. Jeong, H.-S. Kang, D.T. Kim, S.H. Kim, S.-C. Kim, I.S. Ko, H.J. Park, I.-S. Park, S.J. Park, Y.J. Park, S.Y. Rah, J.-H. Suh
    PAL, Pohang, Kyungbuk
  • J.H. Hong, C. Kim
    POSTECH, Pohang, Kyungbuk
  
 

Funding: Work supported by Ministry of Science and Technology (MOST)

Beam diagnostics for PAL-XFEL physics calls for precision of femto-second in time structure and sub-micrometer in beam position measurement(BPM). Existing instruments can be used for standard diagnostics such as single bunch charge measurement, wire scanner or optical transition radiator for beam size measurement. Instead, major R&D efforts should be focused on the measurement of femto-second bunch structure using electro-optic crystal, coherent radiation and transverse deflecting cavity. Nanometer BPM technique being developed in collaboration with linear collider group will also be utilized for sub-micrometer BPM. Overall plan and the ongoing R&D activities will be presented.

  
   
MOPP046 Beam Transport Line Design for Emittance Adjustment PLS X-FEL 153
 
  • M. Kim, Y.S. Bae, J. Choi, H.-S. Kang, T.-Y. Lee
    PAL, Pohang, Kyungbuk
  
 

PLS W-FEL (1.2 GeV) and X-FEL (3.7 GeV) are designed to have large angle about 30 degree and 20 degree totally because of geometric restriction. This results in severe emittance growth. So PLS FEL BTL Design is focused to adjust emittance growth. This paper talks simulation results of emittance growth and another beam dynamic parameters.

  
   
THPP021 Issue of Energy Spread and Transverse Coherency of PAL-XFEL 499
 
  • H.-S. Kang, J. Choi, T.-Y. Lee
    PAL, Pohang, Kyungbuk
  
 

Funding: The Ministry of Science and Technology, Korea

PAL-XFEL has been designed to generate 0.3-nm SASE radiation with 3.7-GeV electron beam and 4-mm gap in-vacuum undulator. The requirement of energy spread in undulator is tighter than LCLS and EU-FEL. Laser beam heating to reduce the micro-bunching instability inevitably induces an increase of energy spread during the bunching process in bunch compressor. Two factors are contradictory, which should be compromised. Transverse higher modes have comparatively large growth rates which results in poor transverse coherency. Growth rates of transverse modes are calculated with different beam conditions.

  
   
THPP024 Study of PAL-XFEL Wake Field Effects with the Genesis Code 502
 
  • T.-Y. Lee, J. Choi, H.-S. Kang
    PAL, Pohang, Kyungbuk
  
 

PAL-XFEL is the newly announced SASE FEL project that is going to achieve 0.3 nm wavelength radiation with 3.7 GeV electron beam. To overcome the relatively low energy of 3.7 GeV, short period and small gap in-vacuum undulator will be adopted. Wake field effects of this in-vacuum undulator on the SASE process is studied in this paper.