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Kim, S. H.

Paper Title Page
TUPMN094 Development of a Model Superconducting Helical Undulator for the ILC Positron Source 1136
 
  • S. H. Kim
  • C. Doose
    ANL, Argonne, Illinois
  
  Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.

Model superconducting helical undulators are under development for the proposed International Linear Collider (ILC) positron source. The undulator requires high-permeability steel poles and superconducting coils to meet the ILC parameters. A fabrication method for steel poles on a nonmagnetic beam chamber was developed. A model undulator with a period length of 14 mm and Nb3Sn coils was fabricated. Both ends of the model were designed to provide for continuous winding of a single conductor with 39 turns per helix. A 10-mm-period model was designed and is in the fabrication process. The 14-mm-period model may be used in the development of a cryogenic magnetic measurement system. Details of the fabrication and test results will be presented.

 
THPMN048 Cold Test on C-band Standing-wave Accelerator 2823
 
  • S. H. Kim
  • M.-H. Cho, Y. M. Gil, S.-I. Moon, W. Namkung, H. R. Yang
    POSTECH, Pohang, Kyungbuk
  • J. Jang, J.-S. Oh, S. J. Park
    PAL, Pohang, Kyungbuk
  
  Funding: Work supported by PAL.

For a compact X-ray source, we designed a C-band standing-wave electron accelerator. It is capable of producing 4-MeV electron beams with 50-mA peak beam current. As an RF source, we use 5-GHz magnetron with duty factor of 0.08%. The accelerating structure is bi-periodic and on-axis coupled structure, operated with π/2-mode standing waves. Each cavity in the bunching and normal cell is designed by the MWS code and measured with aluminium prototype cavity. As per the dispersion relation derived from the measurement results, calibration factor obtained for the actual copper cavity.

 
THPMN049 Current Status of Intense L-band Electron Accelerator for Irradiation Source 2826
 
  • S. H. Kim
  • M.-H. Cho, W. Namkung, H. R. Yang
    POSTECH, Pohang, Kyungbuk
  • S. D. Jang, S. J. Kwon, J.-S. Oh, S. J. Park, Y. G. Son
    PAL, Pohang, Kyungbuk
  
  Funding: Work supported by KAPRA.

An intense L-band electron accelerator is designed and under development for CESC (Cheorwon Electron-beam Service Center) irradiation applications. It is capable of producing 10-MeV electron beams with average 30 kW. For an RF source, a Thales klystron is used with 1.3 GHz, pulsed 25 MW, and average 60 kW. The accelerator column, fabricated by IHEP in China, is operated with 2π/3 mode traveling-wave under the fully-beam-loaded condition. The modulator was fabricated with inverter power supplies. The klystron was assembled to the klystron tank with pulse transformer. The high-voltage pulse test was conducted for the klystron tube. In this paper, we present design details of the accelerator and current status.