Test results from the Wendelstein 7-X stellarator demonstration coil

Wendelstein 7-X (W 7-X) is a stellarator plasma experiment currently under construction in Greifswald, Germany. It is an advanced stellarator with a m agnet system consisting of 50 non-planar superconducting main field coils a nd 20 superconducting planar auxiliary coils in modular toroidal arrangemen t. The auxiliary system is foreseen for the variation of plasma parameters which allows extensive plasma studies in wide parameter ranges. The charact eristic dimensions of a coil are: 3.5 m in height, 2.5 m in width and 1.0 m in thickness. In order to prove the fabricability and the electromagnetic, thermohydraulic and mechanical performance of the coils, a full-size demon stration coil was built by industry and delivered to the Forschungszentrum Karlsruhe for testing. Here, the coil was prepared for installation at the test facility TOSKA beside the EURATOM LCT coil. This coil delivers a backg round field which allows the simulation of different load cases occurring l ater in the experimental device. The aim of the test was the investigation of the mechanical properties and behaviour of the bedding between winding b lock and casing. In this paper, the electromagnetic results obtained during the test will be presented. (C) 2001 Elsevier Science Ltd. All rights rese rved.