22 research outputs found
Systems of Differential Algebraic Equations in Computational Electromagnetics
Starting from space-discretisation of Maxwell's equations, various classical
formulations are proposed for the simulation of electromagnetic fields. They
differ in the phenomena considered as well as in the variables chosen for
discretisation. This contribution presents a literature survey of the most
common approximations and formulations with a focus on their structural
properties. The differential-algebraic character is discussed and quantified by
the differential index concept
Research Activities in Japan on Forward and Inverse Simulations of Eddy Current Testing for Steam Generator Tubes
Commercial nuclear power plants in Japan run with higher safety standards because of the high reliability. Eddy current testing (ECT) plays a crucial role in inspection of steam generator (SG) tubes in pressurized water-type nuclear power plants during their periodic shutdowns. Studies for the development of this technique have been performed on such topics as measurement apparatus and probe design, numerical modeling, and signal processing
Engineering Design, Installation, and Conditioning of Ferritic Steel Plates/Wall for AMTEX in JFT-2M
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Improvement of beam-heated limiter discharges by continuous pellet fueling in Doublet III
A centrifuge pellet injector was employed to produce and maintaun high-density peaked profiles with low edge recycling in the Doublet III (DIII) tokamak. Whereas gas-fueled limiter discharges are characterized by high edge recycling and poor confinement during neutral beam injection, the pellet-fueled limiter discharges exhibit low edge recycling and energy confinement that is similar to diverted H-mode discharges (P-mode). In comparison to gas-fueled discharges, which have a n/sub e/ (0) approx. 1.0 x 10/sup 14/ cm/sup -3/ and tau/sub E/ approx. 45 ms, the values for pellet fueling were increased to n/sub e/ (0) approx. 2.0 x 10/sup 14/ cm/sup -3/ amd tau/sub E/ approx. 70 ms at 2.4 MW of beam heating. The neutron production rate was increased from 1 x 10/sup 11/ s/sup -1/ to 1 x 10/sup 12/ s/sup -1/. A technique of interrupting the neutral beam injectors just prior to injecting each pellet resulted in reduced edge ablation and a further enhancement in energy confinement for a peak beam power of 3.2 MW at a 53% duty cycle. Pellet fueling of divertor H-mode plasmas was also studied. In this case, the confinement times are not dramatically improved, but high-density discharges can be produced while maintaining the H-mode