ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
Meeting Spotlight
2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Apr 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
June 2024
Nuclear Technology
May 2024
Fusion Science and Technology
Latest News
NRC wants input on Hermes 2 test reactor construction permit
The Nuclear Regulatory Commission is seeking input on its draft environmental assessment and draft finding of no significant impact for Kairos Power’s application to build the Hermes 2 test reactor facility in Oak Ridge, Tenn.
Y. Kamada, T. Fujita, S. Ishida, M. Kikuchi, S. Ide, T. Takizuka, H. Shirai, Y. Koide, T. Fukuda, N. Hosogane, K. Tsuchiya, T. Hatae, H. Takenaga, M. Sato, H. Nakamura, O. Naito, N. Asakura, H. Kubo, S. Higashijima, Y. Miura, R. Yoshino, K. Shimizu, T. Ozeki, T. Hirayama, M. Mori, Y. Sakamoto, Y. Kawano, A. Isayama, K. Ushigusa, Y. Ikeda, H. Kimura, T. Fujii, T. Imai, M. Nagami, S. Takeji, T. Oikawa, T. Suzuki, T. Nakano, N. Oyama, S. Sakurai, S. Konoshima, T. Sugie, K. Tobita, T. Kondoh, H. Tamai, Y. Neyatani, A. Sakasai, Y. Kusama, K. Itami, M. Shimada, H. Ninomiya, H. Urano
Fusion Science and Technology | Volume 42 | Number 2 | September-November 2002 | Pages 185-254
Technical Paper | doi.org/10.13182/FST02-A227
Articles are hosted by Taylor and Francis Online.
Fusion plasma performance and confinement studies on JT-60 and JT-60U are reviewed. With the main aim of providing a physics basis for ITER and the steady-state tokamak reactors, JT-60/JT-60U has been developing and optimizing the operational concepts, and extending the discharge regimes toward sustainment of high integrated performance in the reactor relevant parameter regime. In addition to achievement of high fusion plasma performances such as the equivalent breakeven condition (QDTeq up to 1.25) and a high fusion triple product nD(0)ETi(0) = 1.5 × 1021 m-3skeV, JT-60U has demonstrated the integrated performance of high confinement, high N, full non-inductive current drive with a large fraction of bootstrap current. These favorable performances have been achieved in the two advanced operation regimes, the reversed magnetic shear (RS) and the weak magnetic shear (high-p) ELMy H modes characterized by both internal transport barriers (ITB) and edge transport barriers (ETB). The key factors in optimizing these plasmas towards high integrated performance are control of profiles of current, pressure, rotation, etc. utilizing a variety of heating, current drive, torque input, and particle control capabilities and high triangularity operation. As represented by discovery of ITBs (density ITB in the central pellet mode, ion temperature ITB in the high-p mode, and electron temperature ITB in the reversed shear mode), confinement studies in JT-60/JT-60U have been emphasizing freedom and also restriction of radial profiles of temperature and density. In addition to characterization of confinement and analyses of transport properties of the OH, the L-mode, the H-mode, the pellet mode, the high-p mode, and the RS mode, JT-60U has clarified formation conditions, spatial structures and dynamics of edge and internal transport barriers, and evaluated effects of repetitive MHD events on confinement such as sawteeth and ELMs. Through these studies, JT-60U has demonstrated applicability of the high confinement modes to ITER and the steady-state tokamak reactors.