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the NB Heating Technology Group,Kojima, A.,Hanada, M.,Jeong, S.H.,Bae, Y.S.,Chang, D.H.,Kim, T.S.,Lee, K.W.,Park, M.,Jung, B.K.,Mogaki, K.,Komata, M.,Dairaku, M.,Kashiwagi, M.,Tobari, H.,Watanabe, K. North-Holland ; Elsevier Science Ltd 2016 Fusion engineering and design Vol.102 No.-
The long-pulse acceleration of the high-power positive ion beam has been demonstrated with the JT-60 positive ion source in the joint experiment among Japan Atomic Energy Agency (JAEA), Korea Atomic Energy Research Institute (KAERI) and National Fusion Research Institute (NFRI) under the collaboration program for the development of plasma heating and current drive systems. In this joint experiment, the increase of the heat load and the breakdowns induced by the degradation of the beam optics due to the gas accumulation was one of the critical issues for the long-pulse acceleration. As a result of development of the long-pulse operation techniques of the ion source and facilities of the neutral beam test stand in KAERI, 2MW 100s beam has been achieved for the first time. The achieved beam performance satisfies the JT-60SA requirement which is designed to be a 1.94MW ion beam power from an ion source corresponding to total neutral beam power of 20MW with 24 ion sources. Therefore, it was found that the JT-60 positive ion sources were applicable in the JT-60SA neutral beam injectors. Moreover, because this ion source is planned to be a backup ion source for KSTAR, the operational region and characteristic has been clarified to apply to the KSTAR neutral beam injector.
Hasebe, T.,Nagashima, S.,Kamijo, A.,Moon, M.W.,Kashiwagi, Y.,Hotta, A.,Lee, K.R.,Takahashi, K.,Yamagami, T.,Suzuki, T. Elsevier 2013 Diamond and related materials Vol.38 No.-
We investigated the hydrophobicity and non-thrombogenicity of a nanoscale dual rough surface coated with hydrophobic and non-thrombogenic fluorine-incorporated diamond-like carbon (F-DLC) films. We prepared Si (1 0 0) and a dual rough surface composed of coarse posts and nano-sized fine posts as substrates. DLC film was deposited on the Si substrate, and F-DLC film was deposited on Si or the dual rough surface using radio frequency plasma enhanced chemical vapor deposition method. The surface hydrophobicity of each sample was examined with water contact angle measurements and the non-thrombogenicity was evaluated through incubation with platelet-rich plasma isolated from human whole blood. The water repellency was dramatically improved on the F-DLC-coated dual rough surface compared with that on DLC-coated Si or F-DLC-coated Si, which had a water contact angle of 130.6<SUP>o</SUP>. There was no significant difference in the values for the platelet-covered area between DLC-coated Si and the F-DLC-coated dual rough surface. As DLC is being considered for widespread clinical use as a surface coating for medical devices owing to its non-thrombogenicity compared with other biomaterials, the F-DLC-coated dual rough surface presented in this study still has the potential for clinical use, such as temporary blood-contacting medical devices, to take advantage of its high hydrophobicity.
오병훈,C.S. Seo,D.H. Chang,K. Watanabe,K. Usui,K.W. Lee,M. Kawai,M. Kashiwagi,S.H. Jeong,T. Inoue,T.S. Kim,Y. Ikeda 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
A prototype ion source for the KSTAR Neutral Beam (NB) heating system has a multi-cusp plasma chamber with a filament array to produce and maintain a large volume of a uniform and high-density plasma. The filament configuration proper to the structure of cusp magnetic fields is one of the most important factors governing the discharge characteristics of the plasma. The discharge performance of the KSTAR prototype ion source in a fixed-cusp field has been investigated experimentally for three different filament configurations: 1) 32 filaments with a TFTR layer; 2) 32 filaments in a uniformly distributed layer; and 3) 24 filaments in an electron-effective layer. The arc discharge efficiency, defined as the ratio of the ion density to the input arc power, and the plasma uniformity measured by 8 Langmuir probes distributed around the large beam extraction area are the key parameters in estimating the discharge performance of the ion source. The experimental results show that it is necessary to modify not only the filament configuration but also the structure of the cusp magnetic field in the bucket chamber to get a higher plasma efficiency in the source.