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A new type of dismountable and gas-permeable high voltage insulation was developed for the cable-in-conduit conductor connections of the superconducting Wendelstein 7-X (W7-X) magnet system. The gas-permeable high voltage insulation was tested with regard to direct current voltage strength and to gas flow for He below atmospheric pressure. Experiments were performed around the Paschen minimum region at ambient as well as LN(2) temperatures. The results show that this type of insulation has sufficient strength for the specified test voltage of 12 kV under all vacuum conditions. The gas flow investigations proved that the flow resistance and the ability to hold helium will hinder neither the pumping of the W7-X cryostat nor the leak tests. These experiments show the principal property of the proposed insulation system. Further investigations would be needed for a better physical understanding and for optimization. However, the development is so far advanced that one could start to build an insulation prototype for W7-X. A patent application was filed for this gas-permeable and dismountable high voltage insulation which is also suitable for other large superconducting magnets with cable-in-conduit conductors.

Additional information

Authors: SCHAUER F, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP 2/332 EN (1996) 30pp.
Availability: Available from the Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
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