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The magnet system of the Wendelstein 7-X stellarator (W7-X) consists of 50 nonplanar and 20 planar coils. In particular, the winding packs of the nonplanar coils are densely packed and compressed in the area of inter-layer joints and coil terminations, which brings some risk of inter-turn and inter-layer short circuits. The paper describes methods deducted from impulse and ac tests performed on the...
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