Search Results - "Matsunaga, G"

Prediction of high-beta disruptions in JT-60U based on sparse modeling using exhaustive search by Yokoyama, T., Miyoshi, Y., Hiwatari, R., Isayama, A., Matsunaga, G., Oyama, N., Igarashi, Y., Okada, M., Ogawa, Y.

“…•Disruption predictor based on high-beta plasma experimental data in JT-60U.•Input plasma parameters are selected by sparse modeling using exhaustive…”
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Identification of a low plasma-rotation threshold for stabilization of the resistive-wall mode by Takechi, M, Matsunaga, G, Aiba, N, Fujita, T, Ozeki, T, Koide, Y, Sakamoto, Y, Kurita, G, Isayama, A, Kamada, Y

“…The plasma rotation necessary for stabilization of resistive-wall modes (RWMs) is investigated by controlling the toroidal plasma rotation with external…”
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Conceptual design of the MGI system for JT-60SA by Dibon, M., Nakamura, S., Matsunaga, G., Isayama, A., Phillips, G., Sozzi, C., Davis, S.

“…•Layout of the JT-60SA MGI system inside and outside of the vacuum vessel.•Detailed description of the MGI valves.•Calculations done for the design of the MGI…”
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Assessment of linear disruption predictors using JT-60U data by Vega, J., Hernández, F., Dormido-Canto, S., Isayama, A., Joffrin, E., Matsunaga, G., Suzuki, T.

“…Disruptions are dangerous events in tokamaks that require mitigation methods to alleviate its detrimental effects. A prerequisite to trigger any mitigation…”
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Disruption simulations for JT-60SA design and construction by Takechi, M., Sakurai, S., Masaki, K., Matsunaga, G., Sakasai, A.

“…Disruption simulations with DINA code are performed for JT-60SA design. The simulation results have been applied for the design of many components, not only…”
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In-vessel components for initial operation of JT-60SA by Takechi, M., Tsuru, D., Fukumoto, M., Sasajima, T., Matsunaga, G., Nakamura, S., Yamamoto, S., Itashiki, Y., Hayashi, T., Isayama, A.

“…Minimum sets of in-vessel components were installed for initial operation of JT-60SA in order to product and control the plasma and to know the plasma basic…”
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Final design of the JT-60SA pellet launching system for simultaneous density and ELM control by Lang, P.T., Nakano, T., Davis, S., Matsunaga, G., Pégourié, B., Ploeckl, B., Treuterer, W.

“…The key mission of the new tokamak JT-60SA is to conduct exploitations in view of ITER and to resolve key physics and engineering issues for DEMO. Its pellet…”
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Development of operation scenarios for plasma breakdown and current ramp-up phases in JT-60SA tokamak by Urano, H., Fujita, T., Ide, S., Miyata, Y., Matsunaga, G., Matsukawa, M.

“…The operation scenarios for plasma breakdown and current ramp-up phases in JT-60SA tokamak have been developed and verified in simulation using the TOSCA code…”
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Achievement of precise assembly of the JT-60SA superconducting tokamak by Matsunaga, G., Shibama, Y., Okano, F., Yagyu, J., Takechi, M., Kizu, K., Hamada, K., Murakami, H., Moriyama, S., Hanada, M., Tomarchio, V., Di Pietro, E., Mizumaki, S., Sagawa, K., Hayakawa, A.

“…•We have achieved important mile stone for this project at the end of March 2020 taking about seven years since 2013. Namely, the tokamak main assembly has…”
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Progress of the magnetic sensor development for JT-60SA by Takechi, M., Matsunaga, G., Sakurai, S., Sasajima, T., Yagyu, J., Kawamata, Y., Kurihara, K., Nakamura, K.

“…In order to obtain information for control of JT-60SA plasma and physics research on the plasma, many types of magnetic sensors are developed. We have designed…”
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Role of pressure gradient on intrinsic toroidal rotation in tokamak plasmas by Yoshida, M, Kamada, Y, Takenaga, H, Sakamoto, Y, Urano, H, Oyama, N, Matsunaga, G

“…The toroidal plasma rotation generated by the external momentum input and by the plasma itself (intrinsic rotation) has been separated through a novel momentum…”
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First EMC3‐EIRENE modelling of JT‐60SA edge plasmas with/without resonant magnetic perturbation field by Tanaka, H., Kawamura, G., Hoshino, K., Kobayashi, M., Matsunaga, G., Suzuki, Y., Lunt, T., Feng, Y., Ohno, N.

“…The first EMC3‐EIRENE modelling for the JT‐60SA edge plasmas with/without the resonant magnetic perturbation field (RMP) was conducted. Both core degradation…”
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Design, research and development for plasma facing components in JT-60SA by Tsuru, D, Fukumoto, M, Hayashi, T, Takechi, M, Nakamura, S, Matsunaga, G, Seki, Y, Ezato, K, Suzuki, S

“…An overview of plasma facing components (PFCs) in JT-60SA is introduced, including the upper divertor, lower divertor, inboard first wall and outboard first…”
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Observation of a complex multistage transition in the JT-60U H-mode edge by Kamiya, K, Ida, K, Sakamoto, Y, Matsunaga, G, Kojima, A, Urano, H, Oyama, N, Koide, Y, Kamada, Y

“…A complex multistage transition of the edge radial electric field is observed in JT-60U H-mode phase without edge localized mode. An interesting feature is…”
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Three-dimensional analysis of JT-60SA conducting structures in view of RWM control by Mastrostefano, S., Bettini, P., Bolzonella, T., Palumbo, M. Furno, Liu, Y.Q., Matsunaga, G., Specogna, R., Takechi, M., Villone, F.

“…•3D electromagnetic modelling of the JT60-SA tokamak has been carried out.•Frequency-domain electromagnetic characterization of active coils has been…”
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Observation of an energetic-particle-driven instability in the wall-stabilized high-beta plasmas in the JT-60U tokamak by Matsunaga, G, Aiba, N, Shinohara, K, Sakamoto, Y, Isayama, A, Takechi, M, Suzuki, T, Oyama, N, Asakura, N, Kamada, Y, Ozeki, T

“…We have observed a bursting mode in the high-beta plasmas above the ideal beta limit without a conducting wall. The mode frequency is chirping down as the mode…”
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Thermal and Mechanical Design of Error Field Correction Coil for JT-60SA by Murakami, H., Matsunaga, G., Takechi, M., Sukegawa, A., Sakurai, S., Kizu, K., Tsuchiya, K., Koide, Y., Yoshida, K.

“…The inhomogeneous poloidal magnetic field of tokamak device, which is called error field, has to be reduced because the error field degrades the plasma…”
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Development of magnetic sensors for JT-60SA by Takechi, M., Matsunaga, G., Sakurai, S., Sasajima, T., Yagyu, J., Hoshi, R., Kawamata, Y., Kurihara, K., Nishikawa, T., Ryo, T., Kagamihara, S., Nakamura, K.

“…JT-60SA has been designed and is being constructed to demonstrate and develop steady-state high-beta operation. Resistive wall mode (RWM) control, error field…”
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Edge Radial Electric Field Formation after the L-H Transition on JT-60U by Kamiya, K., Matsunaga, G., Honda, M., Miyato, N., Urano, H., Kamada, Y., Ida, K., Itoh, K., the JT-60 team

“…Spatio‐temporal measurements of the impurity ion temperature, density, and rotation profiles around the plasma edge region have been made in the JT‐60U…”
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Forced magnetic reconnection and field penetration of an externally applied rotating helical magnetic field in the TEXTOR tokamak by Kikuchi, Y, de Bock, M F M, Finken, K H, Jakubowski, M, Jaspers, R, Koslowski, H R, Kraemer-Flecken, A, Lehnen, M, Liang, Y, Matsunaga, G, Reiser, D, Wolf, R C, Zimmermann, O

“…The magnetic field penetration process into a magnetized plasma is of basic interest both for plasma physics and astrophysics. In this context special…”
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