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
Aerospace Nuclear Science & Technology
Organized to promote the advancement of knowledge in the use of nuclear science and technologies in the aerospace application. Specialized nuclear-based technologies and applications are needed to advance the state-of-the-art in aerospace design, engineering and operations to explore planetary bodies in our solar system and beyond, plus enhance the safety of air travel, especially high speed air travel. Areas of interest will include but are not limited to the creation of nuclear-based power and propulsion systems, multifunctional materials to protect humans and electronic components from atmospheric, space, and nuclear power system radiation, human factor strategies for the safety and reliable operation of nuclear power and propulsion plants by non-specialized personnel and more.
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.
Y. S. Bae, M. Joung, J. H. Jeong, S. W. Yoon, J. H. Kim, S. H. Hahn, W. H. Ko, S. G. Lee, K. D. Lee, H. L. Yang, Y. K. Oh, J. G. Kwak, W. Namkung, M. H. Cho, H. Park, K. Kim, Y.-S. Na, R. Prater, Y. Gorelov, J. Lohr, R. Ellis, J. Hosea, K. Sakamoto, K. Kajiwara, Y. Oda, H. Tanaka, T. Maekawa, K. Hada, and Kstar Team
Fusion Science and Technology | Volume 65 | Number 1 | January 2014 | Pages 88-102
Lecture | doi.org/10.13182/FST13-644
Articles are hosted by Taylor and Francis Online.
Since the first plasma in Korea Superconducting Tokamak Advanced Research (KSTAR), the electron cyclotron heating (ECH) system has been an essential tool for ECH-assisted start-up using second-harmonic 84-GHz and 110-GHz ECH and for experimental studies of other physics issues such as edge-localized mode control, rotation control, sawtooth control, tearing mode control, and core impurity control for long-pulse discharge and noninductive start-up. The loop voltage in KSTAR is limited by superconducting ohmic coils and a thick vacuum vessel. The ECH-assisted start-up was useful to overcome burn-through during the ramp-up phase with limited loop voltage by the electron cyclotron beam injection before or after the onset of the inductive loop voltage to reduce resistive power consumption. Later, the 170-GHz ECH system is installed as a main electron heating and local current drive for the control of magnetohydrodynamic modes such as sawteeth and neoclassical tearing modes. The 170-GHz gyrotron is an ITER preprototype gyrotron developed by the Japan Atomic Energy Agency. Second-harmonic 170-GHz ECH-assisted start-up was also attempted with a raised toroidal magnetic field of 3 T in the 2011 KSTAR campaign, and flux saving in the ramp-up phase was observed. This lecture describes the physics issues and experimental results of the KSTAR ECH system. The present status and an upgrade plan of the KSTAR ECH system is also described.