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Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
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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!
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Fusion Science and Technology
Latest News
The fire that powers the universe: Harnessing inertial fusion energy
It was a laser shot for the ages. By achieving fusion ignition on December 5, 2022, Lawrence Livermore National Laboratory proved that recreating the “fire” that fuels the sun and the stars inside a laboratory on Earth was indeed scientifically possible.
N. Tamura, S. Inagaki, T. Tokuzawa, C. Michael, K. Tanaka, K. Ida, T. Shimozuma, S. Kubo, K. Itoh, Y. Nagayama, K. Kawahata, S. Sudo, A. Komori, LHD Experiment Group
Fusion Science and Technology | Volume 58 | Number 1 | July-August 2010 | Pages 122-130
Chapter 3. Confinement and Transport | Special Issue on Large Helical Device (LHD) | doi.org/10.13182/FST10-A10799
Articles are hosted by Taylor and Francis Online.
The observation of a significant rise of the core electron temperature Te in response to edge cooling in a helical plasma was first made on the Large Helical Device (LHD). When the phenomenon takes place, the core electron heat flux is reduced abruptly without changing the thermodynamic values in the region of interest (core). Thus, the phenomenon observed in LHD can be equated to a "nonlocal transport phenomenon," observed so far only in tokamaks. The nonlocal transport phenomenon in LHD takes place in almost the same parametric domain (i.e., in a high-temperature and low-density regime) as in tokamaks. Meanwhile, various new aspects of the nonlocal transport phenomenon have been revealed by the LHD experiments; for example, (1) in LHD, the nonlocal transport phenomenon has been observed in net current-free plasmas sustained only by electron cyclotron heating. This experimental result can completely rule out the contribution of the toroidal plasma current as a reason for the nonlocal transport phenomenon. (2) It has been found that during the nonlocal transport phenomenon, there appears a strong correlation between core electron heat flux and edge Te gradient on a timescale shorter than the diffusion time and a spatial scale longer than the microturbulence correlation length. At that time, it was also found that an envelope of density fluctuations is modulated with a low frequency (2 kHz), which suggests the existence of a long-ranged turbulent structure in the plasma, where the nonlocal transport phenomenon can appear.