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
Robotics & Remote Systems
The Mission of the Robotics and Remote Systems Division is to promote the development and application of immersive simulation, robotics, and remote systems for hazardous environments for the purpose of reducing hazardous exposure to individuals, reducing environmental hazards and reducing the cost of performing work.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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
Aug 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
September 2024
Nuclear Technology
August 2024
Fusion Science and Technology
Latest News
Constellation accepting applications for 2024 Energy to Educate grant program
Constellation is taking applications for its 2024 E2 Energy to Educate grant program, which provides funding for student projects focusing on energy innovation.
Educators and students in grades 6–12 can apply for program grants of up to $25,000, and those in two- and four-year colleges can apply for grants of up to $50,000.
T. Mizuuchi, F. Sano, K. Nagasaki, H. Okada, S. Kobayashi, K. Hanatani, Y. Torii, Y. Ijiri, T. Senju, K. Yaguchi, K. Sakamoto, K. Toshi, M. Shibano, K. Kondo, Y. Nakamura, M. Kaneko, H. Arimoto, G. Motojima, S. Fujikawa, H. Kitagawa, H. Nakamura, T. Tsuji, M. Uno, S. Watanabe, H. Yabutani, S. Matsuoka, M. Nosaku, N. Watanabe, S. Yamamoto, K. Y. Watanabe, Y. Suzuki, M. Yokoyama
Fusion Science and Technology | Volume 50 | Number 3 | October 2006 | Pages 352-360
Technical Paper | Stellarators | doi.org/10.13182/FST06-A1256
Articles are hosted by Taylor and Francis Online.
In the helical-axis heliotron configuration, bumpiness of the Fourier components in Boozer coordinates is introduced to control the neoclassical transport. The bumpiness helps not only to align the mod-Bmin contours with the magnetic flux surfaces but also to control the balance of bootstrap currents due to helical and toroidal ripples. Effects of bumpiness control on the plasma performance (noninductive currents, fast-ion behavior, and global energy confinement) have been investigated in Heliotron J by selecting three configurations with different bumpiness ([curly epsilon]b = B04/B00 = 0.01, 0.06, and 0.15 at = 2/3) but almost the same edge rotational transform and plasma volume. The dependence of noninductive toroidal currents is qualitatively consistent with the neoclassical prediction for the bootstrap current. The high-bumpiness configuration seems to be preferable for the confinement of fast ions. However, the longer global energy confinement time is not observed in the highest-bumpiness configuration ([curly epsilon]b = 0.15). When the dependence of the effective ripple modulation amplitude in International Stellarator Scaling 04 scaling is examined, the experimental results show that the normalized global energy confinement time seems long in the configuration with the minimum effective ripple modulation amplitude, where [curly epsilon]b is 0.06.