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.
Explore membership for yourself or for your organization.
Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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
Jul 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
August 2025
Nuclear Technology
Fusion Science and Technology
Latest News
ANS joins others in seeking to discuss SNF/HLW impasse
The American Nuclear Society joined seven other organizations to send a letter to Energy Secretary Christopher Wright on July 8, asking to meet with him to discuss “the restoration of a highly functioning program to meet DOE’s legal responsibility to manage and dispose of the nation’s commercial and legacy defense spent nuclear fuel (SNF) and high-level radioactive waste (HLW).”
S. Kitajima, H. Takahashi, Y. Tanaka, H. Utoh, M. Takenaga, M. Yokoyama, S. Inagaki, Y. Suzuki, K. Nishimura, H. Ogawa, J. Shinde, M. Ogawa, H. Aoyama, K. Iwazaki, A. Okamoto, K. Shinto, M. Sasao
Fusion Science and Technology | Volume 50 | Number 2 | August 2006 | Pages 201-206
Technical Paper | Stellarators | doi.org/10.13182/FST06-A1236
Articles are hosted by Taylor and Francis Online.
The influence of the low-order rational surface (n,m) = (5,3) on ion viscosity and radial electric field formation were investigated by electrode current sweep biasing with a hot cathode at the Tohoku University Heliac. In the improved mode, the position of the maximum electric field remained on the n/m = 5/3 rational surface. After the H-L transition, the local maxima shifted outward to the plasma periphery of ~ 0.8. The low-order magnetic islands were formed resonating the magnetic Fourier components of (n,m) = (5,3) by external perturbation coils. As the widths of the magnetic islands were increased, the biasing electrode current required for the improved mode transition increased. It was suggested that the ion viscosity increased according to the increase in magnetic island width. The increase in the biasing electrode current is equivalent to the increase in the driving force for the poloidal rotation. This suggests the possibility of an active viscosity control assisted by externally controlled island width and magnetic island rotation.