S. Tokunaga

JRR-3冷中性子源装置の新型減速材容器に関わる熱流力設計

S. Tokunaga, Hironori HORIGUCHI, Takemi Nakamura

The cold neutron source (CNS) of the research reactor JRR-3 converts thermal neutrons generated in the reactor into low-energy cold neutrons by moderating them with liquid hydrogen stored in the moderator cell. Cold neutrons generated by the CNS are transported to experimental …

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R&D Activities for Fusion DEMO in the QST Rokkasho Fusion Institute

Yasutomo Ishii, N. Aiba, Masami Ando, N. Asakura et autres

The current status and the progress of research and development (R&D) activities for a Fusion DEMO reactor in the National Institutes for Quantum and Radiological Science and Technology (QST) Rokkasho Fusion Institute is reported. In order to advance the Japanese DEMO activity, …

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Study on measurement results of simulated ground with backfill material by Yamanaka soil hardness tester

S. Tokunaga

Design for the distributed data locator service for multi-site data repositories

H. Nakanishi, Kenjiro Yamanaka, S. Tokunaga, Takahisa OZEKI et autres

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Remote experiment with WEST from ITER Remote Experimentation Centre

S. Tokunaga, Philippe Jacques Moreau, J. Signoret, F. Imbeaux et autres

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Effect of collisionality dependence of thermal force on impurity transport under a lower collisional condition in DEMO scrape-off layer plasma

Yuki Homma, K. Hoshino, S. Yamoto, S. Tokunaga et autres

A preceding study (Homma et al 2018 Contrib. Plasma Phys . 58 629–37) presented an advanced model for thermal force whose applicable condition is extended from collisional to relatively low collisional plasma. According to this extended model, the thermal force reduces when …

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Conceptual design of Japan’s fusion DEMO reactor (JADEMO) and superconducting coil issues

K. Tobita, Hiroyasu Utoh, Ryoji Hiwatari, Yuya MIYOSHI et autres

Goals of Japan's fusion demo nstration (DEMO) reactor are to demonstrate (1) steady and stable electric power generation in a power plant scale, (2) self-sufficient production of fuel (tritium), and (3) reasonable availability using a remote maintenance scheme anticipated in a commercial …

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Development of plant concept related to tritium handling in the water-cooling system for JA DEMO

Ryoji Hiwatari, Kazunari Katayama, Makoto M. Nakamura, Yuya MIYOSHI et autres

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Multi‐impurity divertor simulation using a Monte Carlo kinetic impurity transport model

K. Hoshino, Yuki Homma, S. Tokunaga, Kosuke Shimizu

The effects of multi‐impurity transport are important for the divertor plasma performance. To simulate the radiative divertor plasma precisely, we have extended the integrated divertor code, SONIC, to the simulation with multi‐impurity species. For SONIC extension, a new integrated modelling framework using …

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Studies of power exhaust and divertor design for a 1.5 GW-level fusion power DEMO

N. Asakura, K. Hoshino, S. Suzuki, S. Tokunaga et autres

Power exhaust to the divertor and the conceptual design have been investigated for a steady-state DEMO in Japan with 1.5 GW-level fusion power and the major radius of 8.5 m, where the plasma parameters were revised appropriate for the impurity seeding scenario. …

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Conceptual design study of pellet fueling system for DEMO

S. Tokunaga, A. Matsuyama, Y. Someya, Hiroyasu Utoh et autres

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Development of an information system for efficient emergency transportation

Moe Miyata, S. Tokunaga, Ren Ohmura

Patient must be carried to a hospital and given emergency treatment quickly in emergency situations. Existing emergency information systems in Japan are not enough efficient to share required information among the concerning organizations, such as headquarter, fire stations, ambulances, and hospitals, as …

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