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
Fusion Energy
This division promotes the development and timely introduction of fusion energy as a sustainable energy source with favorable economic, environmental, and safety attributes. The division cooperates with other organizations on common issues of multidisciplinary fusion science and technology, conducts professional meetings, and disseminates technical information in support of these goals. Members focus on the assessment and resolution of critical developmental issues for practical fusion energy applications.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
April 2025
Fusion Science and Technology
Latest News
Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
F. Castejón, A. Cappa, M. Tereshchenko, S. S. Pavlov, A. Fernández
Fusion Science and Technology | Volume 52 | Number 2 | August 2007 | Pages 230-239
Technical Paper | Electron Cyclotron Wave Physics, Technology, and Applications - Part 1 | doi.org/10.13182/FST07-A1502
Articles are hosted by Taylor and Francis Online.
The relativistic effects on electron Bernstein wave (EBW) heating of plasmas confined in the TJ-II stellarator are presented in this work. The Ordinary-eXtraordinary-Bernstein mode conversion at the fundamental electron cyclotron harmonic (f = 28 GHz for the TJ-II central magnetic field) is chosen as the scenario for these estimates. This heating scheme presents high absorbed power for central densities above 1.2 × 1019 m-3 and has no upper density limit. Relativistic and nonrelativistic calculations have been performed using the TRUBA beam/ray-tracing code. For this purpose, the weakly relativistic dispersion relation valid for any values of the parallel and perpendicular refractive indexes, thus suitable for EBW, has been obtained. This dispersion relation has been introduced in TRUBA to estimate the ray trajectories and the power absorption to all orders of Larmor radius in the weakly relativistic regime. The result of our comparison is that the relativistic effects are not negligible and must be taken into account both on the ray trajectories and in the power absorption estimations. We also show that the relativistic absorption coefficient is lower than the nonrelativistic one, for the values of parallel refractive index that happen in TJ-II, and the power deposition profile is more centered.