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Most power amplifiers with several FETs in parallel utilize a two‐way power dividing/combining circuit of asymmetric structure. The asymmetric structure provides unequal power dividing/combining characteristics. In this paper the power dividing/combining ratio as a function of the structure is calculated by using the method of moments and is verified by experiments. The relation between unequal power dividing/combining characteristics and the equal phase plane of current flow is also shown. Finally, a method of equalizing the power dividing/combining ratio by making branch line impedances unequal is presented. © 1999 Scripta Technica, Electron Comm Jpn Pt 2, 82(7): 16–22, 1999

The Advanced Limiter Test (ALT) project is the focus of a fruitful and intense International Energy Agreement collaboration on TEXTOR. The pump limiter is a mechanical boundary that is laid out for taking the full heat load of TEXTOR, namely 8 MW (assuming 2 MW radiated power) for 10 s, and provides a pumping efficiency of at least 5% of the working gas. This layout is adopted from the requirements of a fusion reactor: It is mandatory to remove both the full power that is convected to the limiter or divertor and the helium ash that is generated in the fusion process. In order to obtain pumping for all gases, the ALT-II is equipped with turbomolecular pumps. A short description of ALT-II is given, and the power and particle fluxes to the limiter surface and into the exhaust scoops are discussed. Requirements of the helium removal rate for a reactor and relevant measurements are discussed, and particle removal and the power distribution to the limiters are treated. Related topics of the ALT-II program were hydrogen recycling and the measurement of turbulence-induced anomalous particle transport in the plasma edge.

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