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2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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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!
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Fusion Science and Technology
October 2025
Latest News
Empowering the next generation: ANS’s newest book focuses on careers in nuclear energy
A new career guide for the nuclear energy industry is now available: The Nuclear Empowered Workforce by Earnestine Johnson. Drawing on more than 30 years of experience across 16 nuclear facilities, Johnson offers a practical, insightful look into some of the many career paths available in commercial nuclear power. To mark the release, Johnson sat down with Nuclear News for a wide-ranging conversation about her career, her motivation for writing the book, and her advice for the next generation of nuclear professionals.
When Johnson began her career at engineering services company Stone & Webster, she entered a field still reeling from the effects of the Three Mile Island incident in 1979, nearly 15 years earlier. Her hiring cohort was the first group of new engineering graduates the company had brought on since TMI, a reflection of the industry-wide pause in nuclear construction. Her first long-term assignment—at the Millstone site in Waterford, Conn., helping resolve design issues stemming from TMI—marked the beginning of a long and varied career that spanned positions across the country.
S. W. Yoon, A. C. England, W. C. Kim, H. Yonekawa, J. G. Bak, B. H. Park, J. Kim, K. I. You, Y. M. Jeon, S. H. Hahn, Y. K. Oh, J. Chung, K. D. Lee, H. J. Lee, J. A. Leuer, and N. W. Eidietis
Fusion Science and Technology | Volume 65 | Number 3 | May 2014 | Pages 372-383
Technical Paper | doi.org/10.13182/FST13-706
Articles are hosted by Taylor and Francis Online.
KSTAR has a nonlinear magnetic material, INCOLOY® alloy 908 (Incoloy), in toroidal field and poloidal field (PF) coil systems. The effect of Incoloy on the magnetic configuration for the plasma initiation was investigated with systematic magnetic field measurements, finite element model (FEM) calculations, and in situ measurements of the magnetic properties. The profile of the vertical field near the field-null center was measured with a vertically movable electron beam (e-beam) probe and Hall sensor arrays in addition to pickup coils in the vacuum vessel. The measured profiles of the additional fields from Incoloy in the PF coils are in good agreement with the FEM calculations. In a typical KSTAR startup configuration, the effect of Incoloy is significant. First, it degrades the connection length significantly due to an additional vertical field in the field-null region, and second, it changes the radial and vertical stabilities by modifying the radial gradient of the vertical field. Initial up-down asymmetry measurements of the vertical fields showed very small static error fields from the PF coils. Calculations suggest that the main sources of the measured downshift of the plasma column are asymmetric eddy currents in the cryostat.
