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h Ninomiya,T. Imai,T. Fujii,T. Suzuki,T. Fujita,T. Yamamoto,Y. Uesugi,Y. Kamada,Y. Takase,Y. Kudo,Y. Miura,Y. Ikeda,Y. M. Miura,A. Shimizu,A. Kimura,A. Morioka,A. Nishimura,A. Sagara,G. Kurita,H. Kubo 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The NCT Program, in which the present JT-60U is being modified into a superconducting coil machine, is discussed under nationwide collaboration in Japan. Its mission is to establish high-beta steady-state operation for DEMO and to contribute to ITER. NCT is designed to have potential to investigate such research.
Kamada, K.,Nikl, M.,Kurosawa, S.,Shoji, Y.,Pejchal, J.,Ohashi, Y.,Yokota, Y.,Yoshikawa, A. Elsevier [etc.] 2016 Journal of luminescence Vol.169 No.2
Pr doped (Lu,Gd)<SUB>3</SUB>(Ga,Al)<SUB>5</SUB>O<SUB>12</SUB> single crystals were grown by the micro-pulling down (μ-PD) method. The crystals were greenish and transparent with 3.0mm in diameter, 10-30mm in length. Neither visible inclusions nor cracks were observed. Luminescence and scintillation properties were measured. The substitution at the Al<SUP>3+</SUP> sites by Ga<SUP>3+</SUP> in garnet structure has been studied. The Pr<SUP>3+</SUP> 5d-4f emission is observed within 300-380nm wavelength superposed with 312nm emission line of Gd<SUP>3+</SUP>. Pr0.2%:Lu<SUB>2.5</SUB>Gd<SUB>1</SUB>Ga<SUB>3</SUB>Al<SUB>2</SUB>O<SUB>12</SUB> shows highest emission intensity. The light yield of Pr0.2%:Lu<SUB>2.5</SUB>Gd<SUB>0.5</SUB>Ga<SUB>2</SUB>Al<SUB>3</SUB>O<SUB>12</SUB> sample with diameter 3mmx1mm size was around 8000ph/MeV. Two-exponential approximations of scintillation decay showed 39.6ns (30.6%) and 151ns (69.4%) decay times.
Digital silicon photomultiplier readout of a new fast and bright scintillation crystal (Ce:GFAG)
Lee, Y.S.,Leem, H.T.,Yamamoto, S.,Choi, Y.,Kamada, K.,Yoshikawa, A.,Park, S.G.,Yeom, J.Y. North-Holland 2016 Nuclear Instruments & Methods in Physics Research. Vol.832 No.-
A new Gadolinium Fine Aluminum Gallate (Ce:GFAG) scintillation crystal with both high energy resolution and fast timing properties has successfully been grown. Compared to Gd<SUB>3</SUB>Al<SUB>2</SUB>Ga<SUB>3</SUB>O<SUB>12</SUB> (Ce:GAGG), this new inorganic scintillation crystal has a high luminosity similar to and a faster decay time. In this paper, we report on the timing and energy performance results of the new GFAG scintillation crystal read out with digital silicon photomultipliers (dSiPM) for positron emission tomography (PET) application. The best coincidence resolving time (FWHM) of polished 3x3x5mm<SUP>3</SUP> crystals was 223+/-6ps for GFAG crystals compared to 396+/-28ps for GAGG crystals and 131+/-3ps for LYSO crystals respectively. An energy resolution (511keV peak of Na-22) of 10.9+/-0.2% was attained with GFAG coupled to dSiPM after correcting for saturation effect, compared to 9.5+/-0.3% for Ce:GAGG crystals and 11.9+/-0.4% for LYSO crystals respectively. It is expected that this new scintillator may be competitive in terms of overall properties such as energy resolution, timing resolution and growing (raw material) cost, compared to existing scintillators for positron emission tomography (PET).
Lattice Modulation in YMn2O5 and TbMn2O5 Studied by Using Synchrotron Radiation X-rays
Yukio Noda,H Kimura,H Sawa,K Kohn,N Ikeda,S Kobayashi,Y Ishikawa,Y Kamada,Y Wakabayashi 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
RMn2O5 (R = Y and rare earth) shows successive magnetic and ferroelectric phase transitions at about 45 K, 40 K, 39 K, 20 K and 10 K and is called a multiferroic compound. We have investigated the lattice modulation vectors (qL) of YMn2O5 and TbMn2O5 by using single crystal Synchrotron Radiation X-ray diraction and compared them with the magnetic propagation vectors (qM) studied by neutron diraction. The relation of the propagation vectors between magnetic materials and dielectrics is found to be qL = 2qM. A preliminary structure analysis of the atomic displacement pattern in the commensurate ferroelectric phase of TbMn2O5 is discussed.fb
Evaluation of Embrittlement in Isochronal Aged Fe-Cr Alloys by Magnetic Hysteresis Loop Technique
J. N. Mohapatra,Y. Kamada,H. Kikuchi,S. Kobayashi,J. Echigoya,D. G. Park,Y. M. Cheong 한국자기학회 2011 Journal of Magnetics Vol.16 No.2
Fe-Cr alloys with different Cr contents were prepared by an arc melting technique. The alloys were isochronally aged in the range from 400 ℃ to 900 ℃ with 50 ℃ steps with a holding time of 100 hours. The ageing produced embrittlement in the alloys due to either the formation of a Cr-rich α’ phase or a σ phase at high temperatures. Magnetic Hysteresis Loop (MHL) and Micro-Vickers hardness were measured at each step to correlate the magnetic and mechanical properties. Coercivity and hardness of the alloys were increased and remanence decreased up to 500-550 ℃ due to formation of a Cr-rich α’ phase. Beyond 500-550 ℃ range, the coercivity and hardness decreased and remanence increased due to the coarsening or dissolution of the Cr-rich α’ phase. In the Fe-48% Cr alloy, formation of the σ phase at 700 ℃ reduced the maximum induction of the alloy significantly.
Present Status and Future Prospects of the JT-60SA Project
S. Ishida,P. Barabaschi,Y. Kamada 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
The JT-60SA project has been implemented jointly by Europe and Japan since June 2007. Afterthe disassembly of JT-60 from the torus hall had been completed in October 2012, the projectachieved the major milestone of starting the tokamak’s assembly at the JAEA Naka site in January2013 following the completion of the cryostat base in Europe and its transport to Japan. Procurementand assembly activities for components such as the superconducting magnet, cryogenicsystem, power supply, vacuum vessel, divertor and cryostat are progressing on track towards thestart of operation in March 2019. In preparation for exploitation, the JT-60SA Research Plan wasissued in December 2011, and the research integration activities are addressing JT-60SA data management,validation and analysis tools. This paper overviews the latest evolution of the project interms of construction and exploitation for JT-60SA.
Effect of Cr-Rich Phase Precipitation on Magnetic and Mechanical Properties of Fe-20% Cr Alloy
Mohapatra, J. N.,Kamada, Y.,Kikuchi, H.,Kobayashi, S.,Echigoya, J.,Park, D. G.,Cheong, Y. M. IEEE 2011 IEEE transactions on magnetics Vol.47 No.10
<P>Magnetic Hysteresis Loop (MHL) and micro-Vickers hardness measurements were carried out in isothermal aged Fe-20 wt. % Cr alloy. The results were compared with the existing atom probe data at similar heat treated conditions. Coercivity and hardness of the alloy was increased and remanence of the alloy was decreased with the increase in ageing time. Such increase in the magnetic and mechanical hardness was due to the nucleation and growth of Cr rich α' phase. The size of the Cr rich α' phase precipitates were increased and the number density of the precipitates were decreased with the increase in ageing time observed by atom probe analysis. In this work a good correlation between hardness (H<SUB>v</SUB>) and coercivity (H<SUB>c</SUB>) was found with the combined effect of precipitate size (r) and number density (n). A linear relationship was found with the change in coercivity and hardness of the alloy indicating that the MHL technique would be a good Non-Destructive Evaluation (NDE) tool for the evaluation of thermal embrittlement in structural components made of Fe-Cr alloys.</P>