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H. Ohgaki,T. Kii,K. Masuda,M. Omer,T. Misawa,C. H. Pyeon,R. Hajima,T. Hayakawa,T. Shizuma,M. Kando,I. Daito,H. Toyokawa 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.51
A nuclear material detection system based on neutron / gamma-ray hybrid system has been proposed for the container inspection at the sea port. The neutron from the inertial electrostatic confinement fusion source will be used for a fast pre-screening process by using both of neutrons and gamma-rays. The nuclear resonance fluorescence gamma-ray induced by quasi-monochromatic gamma-ray beam from the laser Compton Backscattering will be used in isotope identification for the precise post-screening process. The combination of two different probes, neutrons and gamma-rays, can detect nuclear material hidden by any kind of shielding.
Research Activities on a MIR-FEL and Table-Top THz Generation in Kyoto University
H. Ohgaki,T. Kii,K. Masuda,M. A. Bakr,K. Higashimura,R. Kinjo,S. Ueda,T. Sonobe,Y. U. Jeong,K. Yoshida 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.21
Free Electron Lasers (FEL), which could be useful for developing energy materials, have been exploited at the Institute of Advanced Energy, Kyoto University. A mid-infrared FEL has been developed, and FEL gain saturation at 13.2 µm was achieved for the first time in May 2008. A FEL beam characterization was performed. A macro pulse energy of 5 mJ/pulse and a peak power of about 3 MW were achieved. A FEL beam transport system was constructed in the user room. Furthermore a tabletop THz FEL amplifier for the spectral range from 150 to 300 µm, which consists of a photocathode RF gun and an undulator, has been proposed to strengthen the materials research. For evaluation of the proposed design, a start-to-end simulation was carried out. An output power of about 350 kW is expected with the proposed system. Free Electron Lasers (FEL), which could be useful for developing energy materials, have been exploited at the Institute of Advanced Energy, Kyoto University. A mid-infrared FEL has been developed, and FEL gain saturation at 13.2 µm was achieved for the first time in May 2008. A FEL beam characterization was performed. A macro pulse energy of 5 mJ/pulse and a peak power of about 3 MW were achieved. A FEL beam transport system was constructed in the user room. Furthermore a tabletop THz FEL amplifier for the spectral range from 150 to 300 µm, which consists of a photocathode RF gun and an undulator, has been proposed to strengthen the materials research. For evaluation of the proposed design, a start-to-end simulation was carried out. An output power of about 350 kW is expected with the proposed system.
Mahmoud Bakr,R. Kinjo,Y. W. Choi,M. Omer,K. Yoshida,S. Ueda,M. Takasaki,K. Ishida,N. Kimura,H. Zen,T. Sonobe,T. Kii,K. Masuda,H. Ohgaki 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.51
The heating property of LaB_6 and CeB_6 cathodes is investigated against the Back Bombardment (BB) effect in thermionic RF guns using numerical calculation of the stopping range and deposited heat power inside the cathode materials. Then the change in a cathode temperature and corresponding change of current density during 5.5 μs pulse duration are determined by solving two differential equations. The simulation results show that, the change of current density during the macropulse for LaB_6 two times higher than for CeB_6, hence, the effect of the BB electrons in CeB_6 is less than for LaB_6.