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-Irradiated n-type 4H-SiCBeyer, F. C.*; Hemmingsson, C. G.*; Pedersen, H.*; Henry, A.*; Isoya, Junichi*; Morishita, Norio*; Oshima, Takeshi; Janz
n, E.*
Journal of Physics D; Applied Physics, 45(45), p.455301_1 - 455301_7, 2012/11
Times Cited Count：18 Percentile：57.55(Physics, Applied)Sakasegawa, Hideo; Legendre, F.*; Boulanger, L.*; Brocq, M.*; Chaffron, L.*; Cozzika, T.*; Malaplate, J.*; Henry, J.*; de Carlan, Y.*
Journal of Nuclear Materials, 417(1-3), p.229 - 232, 2011/10
Times Cited Count：64 Percentile：97.53(Materials Science, Multidisciplinary)In our past work, the commercial ferrtic Oxide Dispersion Strengthened (ODS) alloy MA957 had at least two types of nanometer-sized oxide particles: non-stoichiometric Y-, Ti-, O-enriched clusters and Y
TiO
particles. The size of the non-stoichiometric clusters was much smaller than that of YTiO particles and it was confirmed that the non-stoichiometric clusters possibly dominate the oxide dispersion strengthening. Therefore, this study dealt with the stability and evolution mechanisms of non-stoichiometric nanoclusters after the annealing (1473K 
1h). This annealing condition was determined considering the actual condition of consolidation processes. After the annealing, most non-stoichiometric Y-, Ti-, O-enriched clusters were stable, but some clusters became YTiO particles with increasing size. The diffusion of yttrium had an important role for the evolution of these oxides.
-type 4H-SiCBeyer, F. C.*; Hemmingsson, C.*; Pedersen, H.*; Henry, A.*; Janzn, E.*; Isoya, Junichi*; Morishita, Norio*; Oshima, Takeshi
Journal of Applied Physics, 109(10), p.103703_1 - 103703_6, 2011/05
Times Cited Count：17 Percentile：57.65(Physics, Applied)By low-energy electron (200 keV) irradiation into epitaxial n-type 4H-SiC with a dose of 510
/cm
, the bistable M-center is detected in the deep level transient spectroscopy (DLTS) spectrum. The annealing behavior of the M-center is investigated. During the annihilation process of M-center, the bistable EB-centers are detected in the low temperature range of the DLTS spectrum. The value of annealing energy of the M-center is similar to the generation energy of the EB-centers. This suggests that the M-center partially transforms to the EB-centers by annealing. The EB-centers completely disappeared after annealing temperatures higher than 700 
C. Since the threshold energy for moving Si atom in SiC is higher than the applied irradiation energy of electrons, and the annihilation temperatures are relatively low, the M-center and the EB-centers are attributed to defects related to the C atom in SiC.
Beyer, F. C.*; Hemmingsson, C.*; Pedersen, H.*; Henry, A.*; Isoya, Junichi*; Morishita, Norio; Oshima, Takeshi; Janzn, E.*
Materials Science Forum, 645-648, p.435 - 438, 2010/00
By low-energy electron irradiation of epitaxial n-type 4H-SiC, the Deep Level Transient Spectroscopy (DLTS) peaks called the defects Z1/2 and EH6/7 were observed, which were also observed in as-grown layer and the commonly found peaks EH1 and EH3 (M-center) also appeared. New defect named the EB-centers increased after annealing out of EH1 and EH3. Since low energy electron irradiation (less than 220 keV) affects mainly the carbon atom in SiC, both the M- and EB-centers might be carbon related defects.
Matsukawa, Makoto; Kikuchi, Mitsuru; Fujii, Tsuneyuki; Fujita, Takaaki; Hayashi, Takao; Higashijima, Satoru; Hosogane, Nobuyuki; Ikeda, Yoshitaka; Ide, Shunsuke; Ishida, Shinichi; et al.
Fusion Engineering and Design, 83(7-9), p.795 - 803, 2008/12
Times Cited Count：17 Percentile：72.86(Nuclear Science & Technology)no abstracts in English
Henry, D.*; Michel, F.*; Roussel, P.*; Reynaud, P.*; Journeaux, J. Y.*; Marchal, J. L.*; Balaguer, D.*; Roux, C.*; Matsukawa, Makoto; Yoshida, Kiyoshi
AIP Conference Proceedings 985, p.445 - 452, 2008/03
Times Cited Count：0 Percentile：0.07(Thermodynamics)In the framework of the ITER Broader Approach, CEA is carrying out the procurement of the Cryogenic System to the JA-EU Satellite Tokamak JT-60SA, which should be operated in Japan at JAEA, Naka in 2014. According to the Conceptual Design Report, JT-60SA is to operate for periods of at least 6 months per year, with major shutdown periods in between for maintenance and further installation upgrades. For this operation scenario, the cryoplant and the cryodistribution have to cope with different heat loads which depend on the different JT-60SA operating states. The cryoplant consists of one 4.5 K refrigerator and one 80 K helium loop, each pre-cooled by LN2. These cryogenic subsystems have to operate simultaneously in order to remove the heat loads from the superconducting magnets, 80 K shields and the divertor cryopumps. The first part of this study is based on the Process Flow Diagram (PFD) and presents the current design status of the JT-60SA cryogenic system. The second part is dedicated to the analysis of the cryoplant normal operation modes including the regeneration mode of the divertor cryopumps.
-, 4
-, and 6-SiCIsoya, Junichi*; Katagiri, Masayuki*; Umeda, Takahide*; Son, N. T.*; Henry, A.*; Gali, A.*; Morishita, Norio; Oshima, Takeshi; Ito, Hisayoshi; Janzn, E.*
Materials Science Forum, 527-529, p.593 - 596, 2006/00
no abstracts in English
analog state in 
Nb populated by the 
Zr(
, t) reactionVan der Molen, H. K. T.*; Akimune, Hidetoshi*; Van den Berg, A. M.*; Daito, Izuru*; Fujimura, Hisako*; Fujita, Yoshitaka*; Fujiwara, Mamoru; Harakeh, M. N.*; Ihara, F.*; Inomata, Toru*; et al.
Physics Letters B, 502(1-4), p.1 - 8, 2001/03
Times Cited Count：3 Percentile：28.27(Astronomy & Astrophysics)no abstracts in English
