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The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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Nuclear Science and Engineering
Fusion Science and Technology
Fukiushima Daiichi: 10 years on
The Fukushima Daiichi site before the accident. All images are provided courtesy of TEPCO unless noted otherwise.
It was a rather normal day back on March 11, 2011, at the Fukushima Daiichi nuclear plant before 2:45 p.m. That was the time when the Great Tohoku Earthquake struck, followed by a massive tsunami that caused three reactor meltdowns and forever changed the nuclear power industry in Japan and worldwide. Now, 10 years later, much has been learned and done to improve nuclear safety, and despite many challenges, significant progress is being made to decontaminate and defuel the extensively damaged Fukushima Daiichi reactor site. This is a summary of what happened, progress to date, current situation, and the outlook for the future there.
Alan S. Binus, Yijun Lin, Stephen J. Wukitch, Andrew Pfeiffer, David Gwinn
Fusion Science and Technology | Volume 56 | Number 2 | August 2009 | Pages 977-982
Plasma Engineering | Eighteenth Topical Meeting on the Technology of Fusion Energy (Part 2) | dx.doi.org/10.13182/FST09-A9037
Articles are hosted by Taylor and Francis Online.
A real-time ion cyclotron range of frequencies (ICRF) antenna matching system has been successfully implemented on Alcator C-Mod. A triple-stub tuning system working at 80 MHz is used, where one stub acts as a pre-matching stub and the other two stubs incorporate fast ferrite tuners (FFT) to realize fast tuning. It uses a computer based digital controller for feedback control (200 uS per iteration) using real-time antenna loading measurements as inputs and the coil currents to the FFT magnets as outputs. The system has obtained and maintained matching for a large range of plasma parameters, including L-mode, H-mode, and plasmas with edge localized modes, and up to 1.8 MW net RF power into H-mode plasma. The RF power loss in the system has been found to be insignificant when the voltage in the system is below 30 kV. Achieving this level of performance involved several engineering challenges. The ferrite tuners available had to be used in their received configuration and their implementation would accommodate the existing characteristics of the tuners. A suitable range of load matching, operational speed, component protection and thermal management were factors that had to be balanced against tuner characteristics, system complexity and cost containment. The FFTs are permanently operational on Alcator C-Mod.