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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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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Nuclear Technology
Fusion Science and Technology
July 2025
Latest News
Hash Hashemian: Visionary leadership
As Dr. Hashem M. “Hash” Hashemian prepares to step into his term as President of the American Nuclear Society, he is clear that he wants to make the most of this unique moment.
A groundswell in public approval of nuclear is finding a home in growing governmental support that is backed by a tailwind of technological innovation. “Now is a good time to be in nuclear,” Hashemian said, as he explained the criticality of this moment and what he hoped to accomplish as president.
Ethan Coffey, Greg Hanson, David Hill, Timothy Jones, Arnold Lumsdaine, Claire Luttrell, Chuck Schaich
Fusion Science and Technology | Volume 72 | Number 3 | October 2017 | Pages 505-509
Technical Note | doi.org/10.1080/15361055.2017.1333857
Articles are hosted by Taylor and Francis Online.
The ITER Electron Cyclotron Heating (ECH) system provides 20 MW of microwave power from 24 gyrotron sources. The power is transmitted through evacuated, corrugated waveguide transmission lines. The aluminum waveguide is cooled by the attachment of water-cooled copper tubes. These are connected through a conductive graphite foil that is used to increase the heat transfer ability between the aluminum and copper. In the regions where the waveguide is joined to a miter bend or to another waveguide section via a coupling, the waveguide cannot be actively cooled due to coupling hardware. Waveguide sections near couplings and miter bends are modeled and subjected to heat loads based on ITER design specifications. The thermal analysis predicts the maximum waveguide temperature in these regions and the amount of axial thermal expansion of the waveguide.
In addition, testing is done to determine the thermal contact conductance (TCC) between copper and aluminum surfaces with and without several candidate thermal contact materials. These results are used in the finite element analysis to model the ability to transfer heat across interfaces. The TCC test results make it clear that there is significant heat transfer between separate components, as the TCC between components is greater than 5 kW/m2K without thermal contact material and greater than 30 kW/m2K when thin graphite foil is used to increase the heat transfer ability. Therefore miter bends and miter bend mirrors are included as necessary in the finite element model.