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Matsunaga, Go; Takechi, Manabu; Aiba, Nobuyuki; Kurita, Genichi; Sakamoto, Yoshiteru; Koide, Yoshihiko; Isayama, Akihiko; Suzuki, Takahiro; Fujita, Takaaki; Oyama, Naoyuki; et al.
Plasma and Fusion Research (Internet), 4, p.051_1 - 051_7, 2009/11
no abstracts in English
Fujimoto, Kayoko; Nakano, Tomohide; Kubo, Hirotaka; Sawada, Keiji*; Takizuka, Tomonori; Kawashima, Hisato; Shimizu, Katsuhiro; Asakura, Nobuyuki
Plasma and Fusion Research (Internet), 4, p.025_1 - 025_7, 2009/08
The volume recombination in detached divertor plasmas is a key process to reduce the ion flux to the divertor plates. Two-dimensional measurement is one of the ways to investigate a spatial structure of the volume recombination. In this work, the deuterium Balmer-series lines from a detached divertor plasma were observed two-dimensionally with a spatial resolution of 1 cm and were reconstructed into two-dimensional emissivities with a tomography technique. The ratio of the D
to the D
emissivity was compared to that calculated by the collisional-radiative model. This ratio could not be explained only by the excitation of D by electron impact, indicating that the volume recombination contributed to the D emission. This is the case for the region above the inner strike point with 8 cm and 4 cm, respectively, in the r- and the z-direction on the poloidal cross-section.
Ochiai, Kentaro; Iida, Hiromasa; Sato, Satoshi; Takakura, Kosuke; Konno, Chikara
Purazuma, Kaku Yugo Gakkai-Shi, 84(9), p.594 - 599, 2008/09
no abstracts in English
Ishii, Yasutomo; Smolyakov, A. I.*
Plasma and Fusion Research (Internet), 3, p.048_1 - 048_7, 2008/08
no abstracts in English
Yamauchi, Toshihiko; Nakagaki, Keita; Kanno, Yoshinori*; Kobayashi, Seiji*; Takemoto, Ryo*
no journal, ,
The CVD system with internal RF multi-turn antenna coil for 27.12 MHz was developed, and to study the transition between CCP (Capacitively Coupled Plasma) and ICP (Inductively Coupled Plasma). The observed transition was classified into three types of transition: the standard transition, the direct transition with the mixed-mode and the repeated transition. The power boundary condition for each transition which is associated with the gas pressure and RF power is presented. Here, the standard transition was mainly presented: The transition time was 8 microsec at 10 Pa, which became longer with the increase of gas pressure. The increments of electron temperature and density by the transition into ICP were three times and double figures higher respectively.
Hiratsuka, Hajime; Hatano, Toshihisa; Hasegawa, Koichi; Abe, Tetsuya
no journal, ,
no abstracts in English
Okamoto, Masaaki*; Shibata, Yoshihide*; Ono, Noriyasu*; Takamura, Shuichi*; Nakano, Tomohide; Kawano, Yasunori; Sugihara, Masayoshi*
no journal, ,
no abstracts in English
Nakano, Tomohide; Kubo, Hirotaka; Asakura, Nobuyuki; Fujimoto, Kayoko; Shimizu, Katsuhiro; Konoshima, Shigeru; Kawashima, Hisato; Higashijima, Satoru
no journal, ,
no abstracts in English
Sakurai, Shinji; Masaki, Kei; Hayashi, Takao; Shibama, Yusuke; Higashijima, Satoru; Sakasai, Akira; Matsukawa, Makoto
no journal, ,
no abstracts in English
Okano, Fuminori; Miyo, Yasuhiko; Nishiyama, Tomokazu; Sato, Yoji; Sasaki, Noboru*; Honda, Masao*; Sakasai, Akira; Sato, Masayasu
no journal, ,
no abstracts in English
Asakura, Nobuyuki; Kawashima, Hisato; Ono, Noriyasu*; Nakano, Tomohide; Uesugi, Yoshihiko*
no journal, ,
Measurement of visible image emitted during its ablation started since 2006, using a fast TV camera located at tangential port in the JT-60U tokamak. Typical frame rate of the TV camera was between 2 kHz and 8 kHz. Trajectory and velocity of emission during dust ablation were measured in ELMy H-mode plasmas. Trajectory of the ablating dust corresponded to a few meter (near-poloidal case) to several meters (near-toroidal case), and toroidal or poloidal velocity was evaluated to be 0.2-0.5 km/s. In divertor, many dusts were observed in inner divertor just after ELM events, in particular, for the inner strike-point located above the normal operations. Toroidal movement of the dusts (ion drift side) was seen frequently and velocity was 0.2-0.4 km/s, which was similar to those at main chamber. Specific movement of dusts was sometimes seen in outer divertor when ELM occurred: dust moved towards separatrix (inboard), then the direction changed away from separatrix (outboard).
Kondo, Hiroo*; Kanemura, Takuji*; Yamaoka, Nobuo*; Miyamoto, Seiji*; Ida, Mizuho; Nakamura, Hiroo; Matsushita, Izuru*; Muroga, Takeo*; Horiike, Hiroshi*
no journal, ,
no abstracts in English
Moriyama, Shinichi; Kobayashi, Takayuki; Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Sawahata, Masayuki; Suzuki, Sadaaki; Terakado, Masayuki; Hiranai, Shinichi; Igarashi, Koichi; et al.
no journal, ,
no abstracts in English
Nakamura, Kazuo*; Matsufuji, Shinji*; Tomoda, Seiji*; Wang, F.*; Mitarai, Osamu*; Kurihara, Kenichi; Kawamata, Yoichi; Sueoka, Michiharu; Sato, Konosuke*; Zushi, Hideki*; et al.
no journal, ,
no abstracts in English
Kagei, Yasuhiro; Tokuda, Shinji
no journal, ,
no abstracts in English
Honda, Mitsuru; Takizuka, Tomonori; Fukuyama, Atsushi*; Yoshida, Maiko; Ozeki, Takahisa
no journal, ,
no abstracts in English
Shimizu, Katsuhiro; Takizuka, Tomonori; Kawashima, Hisato
no journal, ,
As a self-consistent modelling of divertor plasma and impurity transport, we have developed a unified divertor code, SONIC (SOLDOR/NEUT2D/IMPMC). The key feature of this integrated code is to incorporate the elaborate impurity Monte Carlo code, IMPMC. Monte-Carlo (MC) approach is suitable for modelling of interactions between impurities and walls, including kinetic effects, and the complicated dissociation process of hydrocarbons. The MC modelling, however, has the disadvantage for long computational time, large MC noise, and assumption of steady state. The first and second difficulties were solved by developing a new diffusion model and optimizing the IMPMC with a Message Passing Interface (MPI) on the massive parallel computer. The third subject is recently solved by extension of IMPMC code toward time evolution simulation.
Takizuka, Tomonori; Hosokawa, Masanari*
no journal, ,
no abstracts in English
Ozeki, Takahisa
no journal, ,
no abstracts in English
