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2. Completion of JT-60SA construction and contribution to ITER

Author

Kamada Y., Di Pietro E., Hanada M., Barabaschi P., Ide S., Davis S., Yoshida M., Giruzzi G., Sozzi C., Abdel Maksoud W., Abe H., Aiba N., Akiyama T., Ayllon-Guerola J., Arai T., Artaud J. -F., Asakura N., Ashikawa N., Balbinot L., Bando T., Baulaigue O., Belonohy E., Bin W., Bombarda F., Bolzonella T., Bonne F., Bonotto M., Botija J., Cabrera-Perez S., Cardella A., Carraro L., Cavalier J., Chernyshova M., Chiba S., Clement-Lorenzo S., Cocilovo V., Coda S., Coelho R., Coffey I., Collin B., Corato V., Cucchiaro A., Czarski T., Dairaku M., Day C., de la Luna E., De Tommasi G., Decool P., Di Pace L., Dibon M., Disset G., Ejiri A., Endo Y., Ezumi N., Falchetto G., Fassina A., Fejoz P., Ferro A., Fietz W., Figini L., Fornal T., Frello G., Fujita T., Fukuda T., Fukui K., Fukumoto M., Furukawa M., Futatani S., Gabellieri L., Gaio E., Galazka K., Garcia J., Garcia-Dominguez J., Garcia-Lopez J., Garcia-Munoz M., Garzotti L., Gasparini F., Gharafi S., Giacomelli L., Ginoulhiac G., Giudicotti L., Guillen Gonzalez R., Hajnal N., Hall S., Hamada K., Hanada K., Hasegawa K., Hatae T., Hatakeyama S., Hauer V., Hayashi N., Hayashi T., Heller R., Higashijima S., Hinata J., Hiranai S., Hiratsuka J., Hiwatari R., Hoa C., Homma H., Honda A., Honda M., Horiike H., Hoshino K., Hurzlmeier H., Iafrati M., Ibano K., Ichige H., Ichikawa M., Ichimura M., Ida K., Idei H., Iijima T., Iio S., Ikeda R., Ikeda Y., Imai T., Imazawa R., Inagaki S., Inomoto M., Inoue S., Isayama A., Ishida S., Ishii Y., Isobe M., Janky F., Joffrin E., Jokinen A., Kado S., Kajita S., Kajiwara K., Kamata I., Kaminaga A., Kamiya K., Kanapienyte D., Kashiwa Y., Kashiwagi M., Katayama K., Kawamata Y., Kawamura G., Kawano K., Kawashima H., Kin F., Kitajima S., Kiyono K., Kizu K., Kobayashi K., Kobayashi M., Kobayashi S., Kobayashi T., Kocsis G., Koide Yo., Koide Yu., Kojima A., Kokusen S., Komuro K., Konishi S., Kovacsik A., Ksiazek I., Kubkowska M., Kuhner G., Kuramochi M., Kurihara K., Kurki-Suonio T., Kurniawan A. B., Kuwata T., Lacroix B., Lamaison V., Lampasi A., Lang P., Lauber P., Lawson K., Louzguiti A., Maekawa R., Maekawa T., Maeyama S., Maffia G., Maget P., Mailloux J., Maione I., Maistrello A., Malinowski K., Marchiori G., Marechal J. -L., Massaut V., Masuzaki S., Matsunaga G., Matsunaga S., Mayri Ch., Mattei M., Medrano M., Mele A., Meyer I., Michel F., Minami T., Miyata Y., Miyazawa J., Miyo Y., Mizuuchi T., Mogaki K., Morales J., Moreau P., Mori M., Morisaki T., Morishima S., Moriyama S., Moro A., Murakami H., Murayama M., Murakami S., Nagasaki K., Naito O., Nakamura S., Nakano T., Nakashima Y., Nardino V., Narita E., Narushima Y., Natsume K., Nemoto S., Neu R., Nicollet S., Nishikawa M., Nishimura S., Nishiura M., Nishiyama T., Nocente M., Nobuta Y., Novello L., Nunio F., Ochoa S., Ogawa T., Ogawa Y., Ohdachi S., Ohmori Y., Ohno N., Ohtani Y., Ohzeki M., Oishi T., Okano F., Okano J., Okano K., Onishi Y., Osakabe M., Oshima T., Ostuni V., Oya M., Oya Y., Oyama N., Ozeki T., Pasqualotto R., Pelli S., Peretti E., Phillips G., Piccinni C., Pigatto L., Pironti A., Pizzuto A., Plockl B., Polli G., Poncet J. -M., Ponsot P., Puiatti M., Radloff D., Raimondi V., Ramos F., Rancsik P., Ricci D., Ricciarini S., Rincon E., Romano A., Rossi P., Roussel P., Rubino G., Saeki H., Sagara A., Sakakibara S., Sakamoto H., Sakamoto M., Sakamoto Y., Sakasai A., Sakata S., Sakuma T., Sakurai S., Salanon B., Salmi A., Sannazzaro G., Sano R., Sanpei A., Sasajima T., Sasaki S., Sasao H., Sato F., Sato M., Sawahata M., Scherber A., Scully S., Seki M., Seki S., Shibama Y., Shibata Y., Shikama T., Shimada K., Shimono M., Shinde J., Shinya T., Shinohara K., Shirai H., Shiraishi J., Soare S., Soleto A., Someya Y., Streciwilk-Kowalska E., Strobel H., Sueoka M., Sukegawa A., Sulistyanintyas D., Sumida S., Sunaoshi H., Suzuki H., Suzuki M., Suzuki S., Suzuki T., Suzuki Y., Svoboda J., Szabolics T., Szepesi T., Takahashi K., Takase Y., Takechi M., Takeda K., Takeiri Y., Takenaga H., Taliercio C., Tamura N., Tanaka H., Tanaka K., Tani K., Tanigawa H., Tardocchi M., Terakado A., Terakado M., Terakado T., Teuchner B., Tilia B., Tobita K., Toi K., Toida N., Tojo H., Tokitani M., Tokuzawa T., Tormarchio V., Tomine M., Torre A., Totsuka T., Tsuchiya K., Tsujii N., Tsuru D., Tsutsui H., Uchida M., Ueda Y., Uno J., Urano H., Usui K., Utoh H., Valisa M., Vallar M., Vallcorba-Carbonell R., Vallet J. -C., Varela J., Vega J., Verrecchia M., Vieillard L., Villone F., Vincenzi P., Wada K., Wada R., Wakatsuki T., Wanner M., Watanabe F., Watanabe K., Wauters T., Wiesen S., Wischmeier M., Yagi M., Yagyu J., Yajima M., Yokooka S., Yokoyama M., Yamamoto S., Yamanaka H., Yamauchi K., Yamauchi Y., Yamazaki H., Yamazaki K., Yamazaki R., Yamoto S., Yanagi S., Yanagihara K., Yoshizawa N., Zani L., Zito P., Kamada, Y., Di Pietro, E., Hanada, M., Barabaschi, P., Ide, S., Davis, S., Yoshida, M., Giruzzi, G., Sozzi, C., Abdel Maksoud, W., Abe, H., Aiba, N., Akiyama, T., Ayllon-Guerola, J., Arai, T., Artaud, J. -F., Asakura, N., Ashikawa, N., Balbinot, L., Bando, T., Baulaigue, O., Belonohy, E., Bin, W., Bombarda, F., Bolzonella, T., Bonne, F., Bonotto, M., Botija, J., Cabrera-Perez, S., Cardella, A., Carraro, L., Cavalier, J., Chernyshova, M., Chiba, S., Clement-Lorenzo, S., Cocilovo, V., Coda, S., Coelho, R., Coffey, I., Collin, B., Corato, V., Cucchiaro, A., Czarski, T., Dairaku, M., Day, C., de la Luna, E., De Tommasi, G., Decool, P., Di Pace, L., Dibon, M., Disset, G., Ejiri, A., Endo, Y., Ezumi, N., Falchetto, G., Fassina, A., Fejoz, P., Ferro, A., Fietz, W., Figini, L., Fornal, T., Frello, G., Fujita, T., Fukuda, T., Fukui, K., Fukumoto, M., Furukawa, M., Futatani, S., Gabellieri, L., Gaio, E., Galazka, K., Garcia, J., Garcia-Dominguez, J., Garcia-Lopez, J., Garcia-Munoz, M., Garzotti, L., Gasparini, F., Gharafi, S., Giacomelli, L., Ginoulhiac, G., Giudicotti, L., Guillen Gonzalez, R., Hajnal, N., Hall, S., Hamada, K., Hanada, K., Hasegawa, K., Hatae, T., Hatakeyama, S., Hauer, V., Hayashi, N., Hayashi, T., Heller, R., Higashijima, S., Hinata, J., Hiranai, S., Hiratsuka, J., Hiwatari, R., Hoa, C., Homma, H., Honda, A., Honda, M., Horiike, H., Hoshino, K., Hurzlmeier, H., Iafrati, M., Ibano, K., Ichige, H., Ichikawa, M., Ichimura, M., Ida, K., Idei, H., Iijima, T., Iio, S., Ikeda, R., Ikeda, Y., Imai, T., Imazawa, R., Inagaki, S., Inomoto, M., Inoue, S., Isayama, A., Ishida, S., Ishii, Y., Isobe, M., Janky, F., Joffrin, E., Jokinen, A., Kado, S., Kajita, S., Kajiwara, K., Kamata, I., Kaminaga, A., Kamiya, K., Kanapienyte, D., Kashiwa, Y., Kashiwagi, M., Katayama, K., Kawamata, Y., Kawamura, G., Kawano, K., Kawashima, H., Kin, F., Kitajima, S., Kiyono, K., Kizu, K., Kobayashi, K., Kobayashi, M., Kobayashi, S., Kobayashi, T., Kocsis, G., Koide, Yo., Koide, Yu., Kojima, A., Kokusen, S., Komuro, K., Konishi, S., Kovacsik, A., Ksiazek, I., Kubkowska, M., Kuhner, G., Kuramochi, M., Kurihara, K., Kurki-Suonio, T., Kurniawan, A. B., Kuwata, T., Lacroix, B., Lamaison, V., Lampasi, A., Lang, P., Lauber, P., Lawson, K., Louzguiti, A., Maekawa, R., Maekawa, T., Maeyama, S., Maffia, G., Maget, P., Mailloux, J., Maione, I., Maistrello, A., Malinowski, K., Marchiori, G., Marechal, J. -L., Massaut, V., Masuzaki, S., Matsunaga, G., Matsunaga, S., Mayri, Ch., Mattei, M., Medrano, M., Mele, A., Meyer, I., Michel, F., Minami, T., Miyata, Y., Miyazawa, J., Miyo, Y., Mizuuchi, T., Mogaki, K., Morales, J., Moreau, P., Mori, M., Morisaki, T., Morishima, S., Moriyama, S., Moro, A., Murakami, H., Murayama, M., Murakami, S., Nagasaki, K., Naito, O., Nakamura, S., Nakano, T., Nakashima, Y., Nardino, V., Narita, E., Narushima, Y., Natsume, K., Nemoto, S., Neu, R., Nicollet, S., Nishikawa, M., Nishimura, S., Nishiura, M., Nishiyama, T., Nocente, M., Nobuta, Y., Novello, L., Nunio, F., Ochoa, S., Ogawa, T., Ogawa, Y., Ohdachi, S., Ohmori, Y., Ohno, N., Ohtani, Y., Ohzeki, M., Oishi, T., Okano, F., Okano, J., Okano, K., Onishi, Y., Osakabe, M., Oshima, T., Ostuni, V., Oya, M., Oya, Y., Oyama, N., Ozeki, T., Pasqualotto, R., Pelli, S., Peretti, E., Phillips, G., Piccinni, C., Pigatto, L., Pironti, A., Pizzuto, A., Plockl, B., Polli, G., Poncet, J. -M., Ponsot, P., Puiatti, M., Radloff, D., Raimondi, V., Ramos, F., Rancsik, P., Ricci, D., Ricciarini, S., Rincon, E., Romano, A., Rossi, P., Roussel, P., Rubino, G., Saeki, H., Sagara, A., Sakakibara, S., Sakamoto, H., Sakamoto, M., Sakamoto, Y., Sakasai, A., Sakata, S., Sakuma, T., Sakurai, S., Salanon, B., Salmi, A., Sannazzaro, G., Sano, R., Sanpei, A., Sasajima, T., Sasaki, S., Sasao, H., Sato, F., Sato, M., Sawahata, M., Scherber, A., Scully, S., Seki, M., Seki, S., Shibama, Y., Shibata, Y., Shikama, T., Shimada, K., Shimono, M., Shinde, J., Shinya, T., Shinohara, K., Shirai, H., Shiraishi, J., Soare, S., Soleto, A., Someya, Y., Streciwilk-Kowalska, E., Strobel, H., Sueoka, M., Sukegawa, A., Sulistyanintyas, D., Sumida, S., Sunaoshi, H., Suzuki, H., Suzuki, M., Suzuki, S., Suzuki, T., Suzuki, Y., Svoboda, J., Szabolics, T., Szepesi, T., Takahashi, K., Takase, Y., Takechi, M., Takeda, K., Takeiri, Y., Takenaga, H., Taliercio, C., Tamura, N., Tanaka, H., Tanaka, K., Tani, K., Tanigawa, H., Tardocchi, M., Terakado, A., Terakado, M., Terakado, T., Teuchner, B., Tilia, B., Tobita, K., Toi, K., Toida, N., Tojo, H., Tokitani, M., Tokuzawa, T., Tormarchio, V., Tomine, M., Torre, A., Totsuka, T., Tsuchiya, K., Tsujii, N., Tsuru, D., Tsutsui, H., Uchida, M., Ueda, Y., Uno, J., Urano, H., Usui, K., Utoh, H., Valisa, M., Vallar, M., Vallcorba-Carbonell, R., Vallet, J. -C., Varela, J., Vega, J., Verrecchia, M., Vieillard, L., Villone, F., Vincenzi, P., Wada, K., Wada, R., Wakatsuki, T., Wanner, M., Watanabe, F., Watanabe, K., Wauters, T., Wiesen, S., Wischmeier, M., Yagi, M., Yagyu, J., Yajima, M., Yokooka, S., Yokoyama, M., Yamamoto, S., Yamanaka, H., Yamauchi, K., Yamauchi, Y., Yamazaki, H., Yamazaki, K., Yamazaki, R., Yamoto, S., Yanagi, S., Yanagihara, K., Yoshizawa, N., Zani, L., and Zito, P.

Subjects
assembly, Cryostat, Nuclear and High Energy Physics, Materials science, Tokamak, Nuclear engineering, Plasma, Condensed Matter Physics, Field coil, ITER risk mitigation, Overcurrent, law.invention, Control theory, law, Electromagnetic coil, research plan, broader approach, Voltage
Abstract

Construction of the JT-60SA tokamak was completed on schedule in March 2020. Manufacture and assembly of all the main tokamak components satisfied technical requirements, including dimensional accuracy and functional performances. Development of the plasma heating systems and diagnostics have also progressed, including the demonstration of the favourable electron cyclotron range of frequency (ECRF) transmission at multiple frequencies and the achievement of long sustainment of a high-energy intense negative ion beam. Development of all the tokamak operation control systems has been completed, together with an improved plasma equilibrium control scheme suitable for superconducting tokamaks including ITER. For preparation of the tokamak operation, plasma discharge scenarios have been established using this advanced equilibrium controller. Individual commissioning of the cryogenic system and the power supply system confirmed that these systems satisfy design requirements including operational schemes contributing directly to ITER, such as active control of heat load fluctuation of the cryoplant, which is essential for dynamic operation in superconducting tokamaks. The integrated commissioning (IC) is started by vacuum pumping of the vacuum vessel and cryostat, and then moved to cool-down of the tokamak and coil excitation tests. Transition to the super-conducting state was confirmed for all the TF, EF and CS coils. The TF coil current successfully reached 25.7 kA, which is the nominal operating current of the TF coil. For this nominal toroidal field of 2.25 T, ECRF was applied and an ECRF plasma was created. The IC was, however, suspended by an incident of over current of one of the superconducting equilibrium field coil and He leakage caused by insufficient voltage holding capability at a terminal joint of the coil. The unique importance of JT-60SA for H-mode and high-β steady-state plasma research has been confirmed using advanced integrated modellings. These experiences of assembly, IC and plasma operation of JT-60SA contribute to ITER risk mitigation and efficient implementation of ITER operation.

Published
2022

11. Analysis of JT-60SA operational scenarios

Author

Garzotti, L., primary, Barbato, E., additional, Garcia, J., additional, Hayashi, N., additional, Voitsekhovitch, I., additional, Giruzzi, G., additional, Maget, P., additional, Romanelli, M., additional, Saarelma, S., additional, Stankiewitz, R., additional, Yoshida, M., additional, and Zagórski, R., additional

Published
2018
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15. Investigation of sustainable high-β scenarios in the JT-60SA C-wall

Author

Romanelli, M., primary, Aresta-Belo, P., additional, Corrigan, G., additional, Garzotti, L., additional, Harting, D., additional, Koechl, F., additional, Saarelma, S., additional, Wiesen, S., additional, Wischmeier, M., additional, Zagórski, R., additional, Bolzonella, T., additional, Pigatto, L., additional, Garcia, J., additional, Maget, P., additional, de la Luna, E., additional, Hayashi, N., additional, Nakano, T., additional, Ide, S., additional, Yoshida, M., additional, and Urano, H., additional

Published
2017
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16. Physics and operation oriented activities in preparation of the JT-60SA tokamak exploitation

Author

Giruzzi, G., primary, Yoshida, M., additional, Artaud, J.F., additional, Asztalos, Ö., additional, Barbato, E., additional, Bettini, P., additional, Bierwage, A., additional, Boboc, A., additional, Bolzonella, T., additional, Clement-Lorenzo, S., additional, Coda, S., additional, Cruz, N., additional, Day, Chr., additional, De Tommasi, G., additional, Dibon, M., additional, Douai, D., additional, Dunai, D., additional, Enoeda, M., additional, Farina, D., additional, Figini, L., additional, Fukumoto, M., additional, Galazka, K., additional, Galdon, J., additional, Garcia, J., additional, Garcia-Muñoz, M., additional, Garzotti, L., additional, Gil, C., additional, Gleason-Gonzalez, C., additional, Goodman, T., additional, Granucci, G., additional, Hayashi, N., additional, Hoshino, K., additional, Ide, S., additional, Imazawa, R., additional, Innocente, P., additional, Isayama, A., additional, Itami, K., additional, Joffrin, E., additional, Kamada, Y., additional, Kamiya, K., additional, Kawano, Y., additional, Kawashima, H., additional, Kobayashi, T., additional, Kojima, A., additional, Kubo, H., additional, Lang, P., additional, Lauber, Ph., additional, de la Luna, E., additional, Maget, P., additional, Marchiori, G., additional, Mastrostefano, S., additional, Matsunaga, G., additional, Mattei, M., additional, McDonald, D.C., additional, Mele, A., additional, Miyata, Y., additional, Moriyama, S., additional, Moro, A., additional, Nakano, T., additional, Neu, R., additional, Nowak, S., additional, Orsitto, F.P., additional, Pautasso, G., additional, Pégourié, B., additional, Pigatto, L., additional, Pironti, A., additional, Platania, P., additional, Pokol, G.I., additional, Ricci, D., additional, Romanelli, M., additional, Saarelma, S., additional, Sakurai, S., additional, Sartori, F., additional, Sasao, H., additional, Scannapiego, M., additional, Shimizu, K., additional, Shinohara, K., additional, Shiraishi, J., additional, Soare, S., additional, Sozzi, C., additional, Stępniewski, W., additional, Suzuki, T., additional, Suzuki, Y., additional, Szepesi, T., additional, Takechi, M., additional, Tanaka, K., additional, Terranova, D., additional, Toma, M., additional, Urano, H., additional, Vega, J., additional, Villone, F., additional, Vitale, V., additional, Wakatsuki, T., additional, Wischmeier, M., additional, and Zagórski, R., additional

Published
2017
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24. Dynamics of ion internal transport barrier in LHD heliotron and JT-60U tokamak plasmas

Author

Ida, K., primary, Sakamoto, Y., additional, Yoshinuma, M., additional, Takenaga, H., additional, Nagaoka, K., additional, Hayashi, N., additional, Oyama, N., additional, Osakabe, M., additional, Yokoyama, M., additional, Funaba, H., additional, Tamura, N., additional, Tanaka, K., additional, Takeiri, Y., additional, Ikeda, K., additional, Tsumori, K., additional, Kaneko, O., additional, Itoh, K., additional, Inagaki, S., additional, Kobuchi, T., additional, Isayama, A., additional, Suzuki, T., additional, Fujita, T., additional, Matsunaga, G., additional, Shinohara, K., additional, Koide, Y., additional, Yoshida, M., additional, Ide, S., additional, and Kamada, Y., additional

Published
2009
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27. Design optimization for plasma performance and assessment of operation regimes in JT-60SA

Author

Fujita, T., primary, Tamai, H., additional, Matsukawa, M., additional, Kurita, G., additional, Bialek, J., additional, Aiba, N., additional, Tsuchiya, K., additional, Sakurai, S., additional, Suzuki, Y., additional, Hamamatsu, K., additional, Hayashi, N., additional, Oyama, N., additional, Suzuki, T., additional, Navratil, G.A., additional, Kamada, Y., additional, Miura, Y., additional, Takase, Y., additional, Campbell, D., additional, Pamela, J., additional, Romanelli, F., additional, and Kikuchi, M., additional

Published
2007
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28. Simulation of the hybrid and steady state advanced operating modes in ITER

Author

Kessel, C.E., primary, Giruzzi, G., additional, Sips, A.C.C., additional, Budny, R.V., additional, Artaud, J.F., additional, Basiuk, V., additional, Imbeaux, F., additional, Joffrin, E., additional, Schneider, M., additional, Murakami, M., additional, Luce, T., additional, St John, Holger, additional, Oikawa, T., additional, Hayashi, N., additional, Takizuka, T., additional, Ozeki, T., additional, Na, Y.-S., additional, Park, J.M., additional, Garcia, J., additional, and Tucillo, A.A., additional

Published
2007
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31. Chapter 3: MHD stability, operational limits and disruptions

Author

Hender, T.C, primary, Wesley, J.C, additional, Bialek, J, additional, Bondeson, A, additional, Boozer, A.H, additional, Buttery, R.J, additional, Garofalo, A, additional, Goodman, T.P, additional, Granetz, R.S, additional, Gribov, Y, additional, Gruber, O, additional, Gryaznevich, M, additional, Giruzzi, G, additional, Günter, S, additional, Hayashi, N, additional, Helander, P, additional, Hegna, C.C, additional, Howell, D.F, additional, Humphreys, D.A, additional, Huysmans, G.T.A, additional, Hyatt, A.W, additional, Isayama, A, additional, Jardin, S.C, additional, Kawano, Y, additional, Kellman, A, additional, Kessel, C, additional, Koslowski, H.R, additional, Haye, R.J. La, additional, Lazzaro, E, additional, Liu, Y.Q, additional, Lukash, V, additional, Manickam, J, additional, Medvedev, S, additional, Mertens, V, additional, Mirnov, S.V, additional, Nakamura, Y, additional, Navratil, G, additional, Okabayashi, M, additional, Ozeki, T, additional, Paccagnella, R, additional, Pautasso, G, additional, Porcelli, F, additional, Pustovitov, V.D, additional, Riccardo, V, additional, Sato, M, additional, Sauter, O, additional, Schaffer, M.J, additional, Shimada, M, additional, Sonato, P, additional, Strait, E.J, additional, Sugihara, M, additional, Takechi, M, additional, Turnbull, A.D, additional, Westerhof, E, additional, Whyte, D.G, additional, Yoshino, R, additional, Zohm, H, additional, and Group, the ITPA MHD, Disruption and Magnet, additional

Published
2007
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32. Chapter 6: Steady state operation

Author

Gormezano, C, primary, Sips, A.C.C, additional, Luce, T.C, additional, Ide, S, additional, Becoulet, A, additional, Litaudon, X, additional, Isayama, A, additional, Hobirk, J, additional, Wade, M.R, additional, Oikawa, T, additional, Prater, R, additional, Zvonkov, A, additional, Lloyd, B, additional, Suzuki, T, additional, Barbato, E, additional, Bonoli, P, additional, Phillips, C.K, additional, Vdovin, V, additional, Joffrin, E, additional, Casper, T, additional, Ferron, J, additional, Mazon, D, additional, Moreau, D, additional, Bundy, R, additional, Kessel, C, additional, Fukuyama, A, additional, Hayashi, N, additional, Imbeaux, F, additional, Murakami, M, additional, Polevoi, A.R, additional, and John, H.E. St, additional

Published
2007
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34. Design study of National Centralized Tokamak facility for the demonstration of steady state high-β plasma operation

Author

Tamai, H, primary, Akiba, M, additional, Azechi, H, additional, Fujita, T, additional, Hamamatsu, K, additional, Hashizume, H, additional, Hayashi, N, additional, Horiike, H, additional, Hosogane, N, additional, Ichimura, M, additional, Ida, K, additional, Imai, T, additional, Ishida, S, additional, Itoh, S, additional, Kamada, Y, additional, Kawashima, H, additional, Kikuchi, M, additional, Kimura, A, additional, Kizu, K, additional, Kubo, H, additional, Kudo, Y, additional, Kurihara, K, additional, Kurita, G, additional, Kuriyama, M, additional, Masaki, K, additional, Matsukawa, M, additional, Matsuoka, M, additional, Miura, Y, additional, Miura, Y.M, additional, Miya, N, additional, Morioka, A, additional, Nakamura, K, additional, Ninomiya, H, additional, Nishimura, A, additional, Okano, K, additional, Okuno, K, additional, Sagara, A, additional, Sakamoto, M, additional, Sakurai, S, additional, Sato, K, additional, Shimada, R, additional, Shimizu, A, additional, Suzuki, T, additional, Takahashi, H, additional, Takase, Y, additional, Takechi, M, additional, Tanaka, S, additional, Tsuchiya, K, additional, Tsutsui, H, additional, Uesugi, Y, additional, Yatsu, K, additional, and Yoshida, N, additional

Published
2005
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40. Achievement of high fusion triple product, steady-state sustainment and real-time NTM stabilization in high- pELMy H-mode discharges in JT-60U

Author

Isayama, A, primary, Kamada, Y, additional, Hayashi, N, additional, Suzuki, T, additional, Oikawa, T, additional, Fujita, T, additional, Fukuda, T, additional, Ide, S, additional, Takenaga, H, additional, Ushigusa, K, additional, Ozeki, T, additional, Ikeda, Y, additional, Umeda, N, additional, Yamada, H, additional, Isobe, M, additional, Narushima, Y, additional, Ikeda, K, additional, Sakakibara, S, additional, Yamazaki, K, additional, Nagasaki, K, additional, and Team, the JT-60, additional

Published
2003
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42. Development of advanced inductive scenarios for ITER.

Author

Luce, T.C., Challis, C.D., Ide, S., Joffrin, E., Kamada, Y., Politzer, P.A., Schweinzer, J., Sips, A.C.C., Stober, J., Giruzzi, G., Kessel, C.E., Murakami, M., Na, Y.-S., Park, J.M., Polevoi, A.R., Budny, R.V., Citrin, J., Garcia, J., Hayashi, N., and Hobirk, J.

Subjects
TOKAMAKS, PRESSURE, EMPIRICAL research, PLASMA gases, DATABASES
Abstract

Since its inception in 2002, the International Tokamak Physics Activity topical group on Integrated Operational Scenarios (IOS) has coordinated experimental and modelling activity on the development of advanced inductive scenarios for applications in the ITER tokamak. The physics basis and the prospects for applications in ITER have been advanced significantly during that time, especially with respect to experimental results. The principal findings of this research activity are as follows. Inductive scenarios capable of higher normalized pressure (βN ⩾ 2.4) than the ITER baseline scenario (βN = 1.8) with normalized confinement at or above the standard H-mode scaling are well established under stationary conditions on the four largest diverted tokamaks (AUG, DIII-D, JET, JT-60U), demonstrated in a database of more than 500 plasmas from these tokamaks analysed here. The parameter range where high performance is achieved is broad in q95 and density normalized to the empirical density limit. MHD modes can play a key role in reaching stationary high performance, but also define the limits to achieved stability and confinement. Projection of performance in ITER from existing experiments uses empirical scalings and theory-based modelling. The status of the experimental validation of both approaches is summarized here. The database shows significant variation in the energy confinement normalized to standard H-mode confinement scalings, indicating the possible influence of additional physics variables absent from the scalings. Tests using the available information on rotation and the ratio of the electron and ion temperatures indicate neither of these variables in isolation can explain the variation in normalized confinement observed. Trends in the normalized confinement with the two dimensionless parameters that vary most from present-day experiments to ITER, gyroradius and collision frequency, are significant. Regression analysis on the multi-tokamak database has been performed, but it appears that the database is not conditioned sufficiently well to yield a new scaling for this type of plasma. Coordinated experiments on size scaling using the dimensionless parameter scaling approach find a weaker scaling with normalized gyroradius than the standard H-mode scaling. Preliminary studies on scaling with collision frequency show a favourable scaling stronger than the standard H-mode scaling. Coordinated modelling activity has resulted in successful benchmarking of modelling codes in the ITER regime. Validation of transport models using these codes on present-day experiments is in progress, but no single model has been shown to capture the variations seen in the experiments. However, projection to ITER using these models is in general agreement with the favourable projections found with the empirical scalings. [ABSTRACT FROM AUTHOR]

Published
2014
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44. Hydrogen isotope effects on ITG scale length, pedestal and confinement in JT-60 H-mode plasmas.

Author

Urano, H., Takizuka, T., Aiba, N., Kikuchi, M., Nakano, T., Fujita, T., Oyama, N., Kamada, Y., and Hayashi, N.

Subjects
HYDROGEN isotopes, HEAT transfer, PLASMA confinement, ELECTRON temperature, ION temperature, THERMAL diffusivity
Abstract

The dependence of heat transport, edge pedestal and confinement on isotopic composition was investigated in conventional H-mode plasmas. Identical profiles for the electron density, electron temperature and ion temperature were obtained for hydrogen and deuterium plasmas, whereas the required power clearly increased for hydrogen, which resulted in a reduction in heat diffusivity for deuterium. The determination of identical temperature profiles, despite the different heating power, suggested that the characteristics of heat conduction essentially differ for hydrogen and deuterium, even at the same scale length of temperature gradient. The self-regulating physics mechanism determining the overall H-mode confinement was also addressed. The inverse of the ion temperature gradient (ITG) scale length, or VTi/Tl, which is required for a given ion heat diffusivity, increased by a factor of approximately 1.2 for deuterium compared with that for hydrogen. The relationship between edge pedestal pressure and global βp holds true consistently regardless of the difference in the isotopic composition. A higher value of βp was obtained for deuterium because of its smaller ITG scale length and because of the additional stored energy in the thermal and fast ion components, the latter due to an increase in the slowing down time with an increase in isotopic mass. [ABSTRACT FROM AUTHOR]

Published
2013
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45. Effects of local toroidal field ripples due to test blanket modules for ITER on radial transport of thermal ions.

Author

Oyama, N., Urano, H., Shinohara, K., Honda, M., Takizuka, T., Hayashi, N., and Kamada, Y.

Subjects
RIPPLES (Fluid dynamics), THERMAL analysis, IONS, STEEL, MAGNETIC fields, MONTE Carlo method, FERROMAGNETISM, PARTICLES (Nuclear physics)
Abstract

The effects of local toroidal field (TF) ripples due to ferromagnetic steels used in test blanket modules (TBMs) in ITER on the radial transport of thermal ions located near the top of the pedestal are investigated using a fully three-dimensional magnetic field orbit following Monte Carlo (F3D-OFMC) code. In the simulation, the threedimensional motion of 20 000 test particles, distributed near the top of the pedestal (ΨN = 0.91) with the same Maxwellian velocity distribution as the thermal ions at this location, is traced for 1.9 s. In comparison with the number of lost particles in the case without a TBM, the additional loss with three TBM ports expected in ITER is evaluated to be less than 1% of the test particles. The additional losses increase linearly with the number of TBM ports and with the square of the amplitude of the local TF ripple. The poloidal structure of the TF ripple without ferritic inserts and a case with 18 TBM ports are also compared. It is found that cases having the same ripple amplitude at a certain point can have substantially different additional loss rates if the poloidal ripple structure is not the same. The ripple amplitude near the banana tip seems to be the most important factor in determining the radial diffusion of thermal ions. [ABSTRACT FROM AUTHOR]

Published
2012
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47. Cross-machine benchmarking for ITER of neoclassical tearing mode stabilization by electron cyclotron current drive

Author

La Haye, R.J., Prater, R., Buttery, R.J., Hayashi, N., Isayama, A., Maraschek, M.E., Urso, L., and Zohm, H.

Abstract

Neoclassical tearing modes (NTMs) will be the principal limit on performance in ITER in the standard scenario, which has beta well below the ideal kink limit. Measurements of island size from ASDEX Upgrade, DIII-D and JET in beta rampdown experiments are used to determine the marginal size for m/n= 3/2 NTM removal. This is compared with data from ASDEX Upgrade, DIII-D and JT-60U with removal of the 3/2 NTM by electron cyclotron current drive (ECCD) at near constant beta. The empirical marginal island size is consistent in both sets of removal experiments and is found to be about twice the ion banana width. A common methodology is developed for fitting the saturated m/n= 3/2 island before (or without) ECCD in all four experimental devices, ASDEX Upgrade, DIII-D, JET and JT-60U. To this is added (and model tested to experiments) the effect of un-modulated co-ECCD on the island width due to replacing the missing bootstrap current and making the tearing stability parameter ?' more negative. The common model is then used to evaluate the ITER ECCD system, with or without modulation, for both the m/n= 3/2 mode, which is benchmarked here, as well as the m/n= 2/1 NTM. The ITER ECCD top launch system with 20?MW of power is found to be effective in greatly reducing the size of the islands. An m/n= 2/1 mode locking model is used to show that the rotation in ITER should be sufficient for the island reduction by ECCD to avoid locking that causes loss of H-mode and disruption.

Published
2006
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48. Overview of the National Centralized Tokamak programme

Author

Kikuchi, M., Tamai, H., Matsukawa, M., Fujita, T., Takase, Y., Sakurai, S., Kizu, K., Tsuchiya, K., Kurita, G., Morioka, A., Hayashi, N., Miura, Y., Itoh, S., Bialek, J., Navratil, G., Ikeda, Y., Fujii, T., Kurihara, K., Kubo, H., Kamada, Y., Miya, N., Suzuki, T., Hamamatsu, K., Kawashima, H., Kudo, Y., Masaki, K., Takahashi, H., Takechi, M., Akiba, M., Okuno, K., Ishida, S., Ichimura, M., Imai, T., Hashizume, Miura, Y. M., Horiike, H., Kimura, A., Tsutsui, H., Matsuoka, M., Uesugi, Y., Sagara, A., Nishimura, A., Shimizu, A., Sakamoto, M., Nakamura, K., Sato, K., Okano, K., Ida, K., Shimada, H.R., Kishimoto, Y., Azechi, H., Tanaka, S., Yatsu, K., Yoshida, N., Inutake, M., Fujiwara, M., Inoue, N., Hosogane, N., Kuriyama, M., and Ninomiya, H.

Abstract

An overview is given of the National Centralized Tokamak (NCT) programme as a research programme for advanced tokamak research to succeed JT-60U. The mission of NCT is to establish high beta steady-state operation for DEMO and to contribute to ITER. The machine flexibility is pursued in aspect ratio and shape controllability for the demonstration of the high-? steady-state, feedback control of resistive wall modes, wide current and pressure profile control capability and also very long pulse steady-state operation. Existing JT-60 infrastructure such as the heating and current drive system, power supplies and cooling systems will be best utilized for this modification.

Published
2006
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49. Achievement of high fusion triple product, steady-state sustainment and real-time NTM stabilization in high-β<SUB>p</SUB> ELMy H-mode discharges in JT-60U

Author

Isayama, A., Kamada, Y., Hayashi, N., Suzuki, T., Oikawa, T., Fujita, T., Fukuda, T., Ide, S., Takenaga, H., Ushigusa, K., Ozeki, T., Ikeda, Y., Umeda, N., Yamada, H., Isobe, M., Narushima, Y., Ikeda, K., Sakakibara, S., Yamazaki, K., Nagasaki, K., and Team, the JT-60

Abstract

This paper reports results on the progress in steady-state high-βp ELMy H-mode discharges in JT-60U. A fusion triple product, nD(0)τETi(0), of 3.1 × 1020 m−3 s keV under full non-inductive current drive has been achieved at Ip = 1.8 MA, which extends the record value of the fusion triple product under full non-inductive current drive by 50%. A high-beta plasma with βN ~ 2.7 has been sustained for 7.4 s (~60τE), with the duration determined only by the facility limits, such as the capability of the poloidal field coils and the upper limit on the duration of injection of neutral beams. Destabilization of neoclassical tearing modes (NTMs) has been avoided with good reproducibility by tailoring the current and pressure profiles. On the other hand, a real-time NTM stabilization system has been developed where detection of the centre of the magnetic island and optimization of the injection angle of the electron cyclotron wave are done in real time. By applying this system, a 3/2 NTM has been completely stabilized in a high-beta region (βp ~ 1.2, βN ~ 1.5), and the beta value and confinement enhancement factor have been improved by the stabilization.

Published
2003

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