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Suzuki, Yutaka; Kawashima, Hisato; Coster, D. P.*; Sakurai, Shinji; Shimizu, Katsuhiro; Takizuka, Tomonori
Contributions to Plasma Physics, 48(1-3), p.169 - 173, 2008/03
The simulation studies of the divertor for JT-60SA are discussed in both single-null and double-null configurations with the B2.5-Eirene code (SOLPS5.0). Electron density ne of 2 - 5
10
/m
at the edge plasma boundary and power out flux Q
of 20 - 35 MW are parametrically adopted in the simulation. The carbon impurity generated by the sputtering on the divertor targets is also included in the simulation. In the gas puffing cases of fueling gas (D
) and impurity (Ne), the reduction of heat load is confirmed consistently with progressing the dense and cold divertor states. One of the SN simulated results of the divertor properties of electron density and radiation loss profiles indicates that the radiated power in the divertor plasma reached about 60% of Q and the area of high loss power is distributed near the target. The loss power and the distribution of radiative cooling will be investigated in this paper for various operating conditions of JT-60SA.
Tomita, Yukihiro*; Smirnov, R. D.*; Takizuka, Tomonori; Tskhakaya, D.*
Contributions to Plasma Physics, 48(1-3), p.285 - 289, 2008/03
Times Cited Count：6 Percentile：23.57(Physics, Fluids & Plasmas)no abstracts in English
Kawashima, Hisato; Shimizu, Katsuhiro; Takizuka, Tomonori
Contributions to Plasma Physics, 48(1-3), p.158 - 163, 2008/03
Times Cited Count：6 Percentile：23.57(Physics, Fluids & Plasmas)To characterize the divertor pumping for particle control in the SOL/divertor and to extrapolate to future devices, simulations using the SOLDOR/NEUT2D code are performed on JT-60U. It reproduces fairly well the neutral pressure and pumping flux in the exhaust chamber at experiment. It shows that higher pumping capability within is necessary for active particle control. In order to improve pumping capability, we analyze the inward/outward neutral flux into/from the exhaust chamber with introducing the pumping efficiency (pumping flux/generating flux). We find that the efficiency is increased by shortening the distance from pumping slot to strike point on the target or tilting the targets vertically. For the design study of JT-60SA divertor, an increase of the efficiency is indicated with narrowing the pumping slot width. To understand these phenomena, we are identifying the role of neutral processes such as ionization, charge-exchange and so on.
Hayashi, Nobuhiko; Takizuka, Tomonori; Aiba, Nobuyuki; Ozeki, Takahisa; Oyama, Naoyuki
Contributions to Plasma Physics, 48(1-3), p.196 - 200, 2008/03
Times Cited Count：3 Percentile：12.45(Physics, Fluids & Plasmas)The effect of the pressure profile on the energy loss caused by edge localized modes (ELMs) has been investigated by using an integrated simulation code TOPICS-IB based on a transport code with a stability code for the peeling-ballooning modes and a model for scrape-off-layer and divertor plasmas. The steep pressure gradient inside the pedestal top is found to broaden the region of the ELM enhanced transport through the broadening of eigenfunctions and enhance the ELM energy loss. The ELM energy loss in the simulation becomes larger than 15% of the pedestal energy, as is shown in the database of multi-machine experiments.
Shimizu, Katsuhiro; Takizuka, Tomonori; Kawashima, Hisato
Contributions to Plasma Physics, 48(1-3), p.270 - 274, 2008/03
Times Cited Count：6 Percentile：23.57(Physics, Fluids & Plasmas)no abstracts in English
Hiwatari, Ryoji*; Hatayama, Akiyoshi*; Takizuka, Tomonori
Contributions to Plasma Physics, 48(1-3), p.174 - 178, 2008/03
Times Cited Count：1 Percentile：4.76(Physics, Fluids & Plasmas)no abstracts in English
Takizuka, Tomonori; Oyama, Naoyuki; Hosokawa, Masanari*
Contributions to Plasma Physics, 48(1-3), p.207 - 211, 2008/03
Times Cited Count：5 Percentile：19.97(Physics, Fluids & Plasmas)no abstracts in English
Honda, Mitsuru; Fukuyama, Atsushi*
no journal, ,
no abstracts in English
