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Cho, M.-H.

Paper Title Page
WEPMA083 Design of C-band Standing-wave Accelerating Structure 440
 
  • S. H. Kim, M.-H. Cho, W. Namkung, B. Park, H. R. Yang
    POSTECH, Pohang, Kyungbuk
  • S. D. Jang, J.-S. Oh, S. J. Park, Y. G. Son
    PAL, Pohang, Kyungbuk
  
  We design a C-band standing-wave accelerating structure for a compact electron linac. It is capable to produce electron beams with the beam energy of 4 MeV and the pulsed beam current of 50 mA. It is to be operated in the π/2 mode with the on-axis coupled structure. The beamline is composed of the E-gun and the accelerating column with 3 and half bunching cells and 9 and half normal cells. We design standing-wave RF cavities using the OMEGA3P code to implement the asymmetric magnetic coupling slots. For the beam dynamics study, we use the PARMELA code with the SUPERFISH fields configuration. Without the pre-buncher cavity and the focusing magnets, the lost beam power to the wall is 10 kW for the output beam power of 200 kW, while the transmission is 58%.  
THPMA114 Activities on the Nuclear Data Measurement at the Pohang Neutron Facility Based on Electron Linac 800
 
  • G. N. Kim
    Kyungpook National University, Daegu
  • M.-H. Cho, I. S. Ko, W. Namkung
    POSTECH, Pohang, Kyungbuk
  • H.-S. Kang, Y. D. Oh
    PAL, Pohang, Kyungbuk
  
  We report the present status of the Pohang Neutron Facility which consists of an electron linear accelerator, a water-cooled Ta target, and a 12-m time-of-flight path. We measured the neutron total cross-sections in the neutron energy range from 0.1 eV to few hundreds eV by using the neutron time-of-flight method. A 6LiZnS(Ag) glass scintillator was used as a neutron detector. The neutron flight path from the water-cooled Ta target to the neutron detector was 12.1 m. The background level was determined by using notch-filters of Co, In, Ta, and Cd sheets. In order to reduce the gamma rays from Bremsstrahlung and those from neutron capture, we employed a neutron-gamma separation system based on their different pulse shapes. The present measurements of Ta, Hf, Ag, and Mo samples are in general agreement with the evaluated data in ENDF/B-VI. The resonance parameters were extracted from the transmission data from the SAMMY fitting and compared with the previous ones.  
THPMA127 Development of L-band Electron Accelerator for Irradiation Source 821
 
  • S. H. Kim, M.-H. Cho, S.-I. Moon, W. Namkung, B. Park, H. R. Yang
    POSTECH, Pohang, Kyungbuk
  • S. D. Jang, J.-S. Oh, S. J. Park, Y. G. Son
    PAL, Pohang, Kyungbuk
  
  An intense L-band electron accelerator is under development for irradiation applications. It is capable of producing 10-MeV electron beams of 30 kW with the fully beam-loaded condition. The accelerator is powered by a pulsed klystron of 1.3 GHz and 25 MW with the 60-kW average power. The accelerating column, a traveling-wave structure, is operated with the 2π/3 mode and is installed vertically with other beam-line components. With the beam dynamics simulation, the beam transmission efficiency is over 90% and the beam size is enough to clear the apertures. Design details and the status of installation are presented for the L-band electron accelerator.