TY - JOUR
T1 - Research activities on tokamaks in Japan
T2 - JT-60U, JFT-2M, and TRIAM-1M
AU - Ninomiya, Hiromasa
AU - Kitsunezaki, Akio
AU - Shimizu, Masatsugu
AU - Kuriyama, Masaaki
AU - Kimura, Haruyuki
AU - Kawashima, Hisato
AU - Tsuzuki, Kazuhiro
AU - Sato, Masayasu
AU - Isei, Nobuaki
AU - Miura, Yukitoshi
AU - Hoshino, Katsumichi
AU - Kamiya, Kensaku
AU - Ogawa, Toshihide
AU - Ogawa, Hiroaki
AU - Miyachi, Kengo
AU - Itoh, Satoshi
AU - Yoshida, Naoaki
AU - Hanada, Kazuaki
AU - Nakamura, Kazuo
AU - Zushi, Hideki
AU - Sakamoto, Mizuki
AU - Jotaki, Eriko
AU - Hasegawa, Makoto
PY - 2002/7
Y1 - 2002/7
N2 - Research activities of the Japanese tokamaks JT-60U, JFT-2M, and TRIAM-1M are described. The recent JT-60 program is focused on the establishment of a scientific basis of advanced steady-state operation. Plasma performance in transient and quasi steady states has been significantly improved, utilizing reversed shear and weak shear (high-βp) ELMy H-modes characterized by both internal and edge transport barriers and high bootstrap current fractions. Development of each key issue for advanced steady-state operation has also been advanced. Advanced and basic research of JFT-2M has been performed to develop high-performance tokamak plasma as well as the structural material for a fusion reactor. Toroidal field ripple reduction with ferritic steel plates outside the vacuum vessel is successfully demonstrated. No adverse effects to the plasma were observed with poloidal fields inside the vacuum vessel (partial covering). Preparation is in progress for full-scale testing of the compatibility of the ferritic steel wall (full covering) with plasma. A heavy ion beam probe has been installed to study H-mode plasmas. Compact toroid (CT) injection experiments are performed, showing deep CT penetration into the core region of the H-mode. The TRIAM project has investigated steady-state operation and high-performance plasma of a tokamak with the high toroidal magnetic field superconducting tokamak. Four important contributions in the fields of fusion technology of superconducting tokamaks, steady-state operation, high-performance plasma, and startup of plasma current without the assistance of center solenoid coils have been achieved on TRIAM-1M, especially regarding steady-state operation by realization of a discharge for > 3 h.
AB - Research activities of the Japanese tokamaks JT-60U, JFT-2M, and TRIAM-1M are described. The recent JT-60 program is focused on the establishment of a scientific basis of advanced steady-state operation. Plasma performance in transient and quasi steady states has been significantly improved, utilizing reversed shear and weak shear (high-βp) ELMy H-modes characterized by both internal and edge transport barriers and high bootstrap current fractions. Development of each key issue for advanced steady-state operation has also been advanced. Advanced and basic research of JFT-2M has been performed to develop high-performance tokamak plasma as well as the structural material for a fusion reactor. Toroidal field ripple reduction with ferritic steel plates outside the vacuum vessel is successfully demonstrated. No adverse effects to the plasma were observed with poloidal fields inside the vacuum vessel (partial covering). Preparation is in progress for full-scale testing of the compatibility of the ferritic steel wall (full covering) with plasma. A heavy ion beam probe has been installed to study H-mode plasmas. Compact toroid (CT) injection experiments are performed, showing deep CT penetration into the core region of the H-mode. The TRIAM project has investigated steady-state operation and high-performance plasma of a tokamak with the high toroidal magnetic field superconducting tokamak. Four important contributions in the fields of fusion technology of superconducting tokamaks, steady-state operation, high-performance plasma, and startup of plasma current without the assistance of center solenoid coils have been achieved on TRIAM-1M, especially regarding steady-state operation by realization of a discharge for > 3 h.
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U2 - 10.13182/FST02-A210
DO - 10.13182/FST02-A210
M3 - Article
AN - SCOPUS:0036646449
SN - 1536-1055
VL - 42
SP - 7
EP - 31
JO - Fusion Science and Technology
JF - Fusion Science and Technology
IS - 1
ER -