Regensburg 2016 – wissenschaftliches Programm

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 1: Large Vacuum Systems

VA 1.1: Hauptvortrag

Montag, 7. März 2016, 09:00–09:45, H25

The stellarator Wendelstein 7-X: vacuum technology, vacuum leak search, system commissioning — •Juergen Baldzuhn, Hans-Stephan Bosch, Heinz Grote, Olaf Volzke, and Lutz Wegener — Max-Planck Institute for Plasma Physics, 17491 Greifswald, Germany

The new stellarator Wendelstein 7-X (W 7-X) is now (Nov. 2015) almost ready to go into plasma operation. This experimental plasma device is built to exploit the potential of nuclear fusion in a toroidal arrangement. The plasma will be situated inside a non-magnetic stainless steel vessel, surrounded by seventy superconducting and fifteen normal conducting coils. In order to guarantee reliable plasma operation, the vacuum pressure inside the plasma vessel must be in the range of 10-8 mbar. Mechanical pumps are available today for the evacuation of the vessels. In the future they will be complemented by cryo-pumps. A description of the stellarator W 7-X will be given. Emphasis is on the vacuum systems and the particular requirements for the technical vacuum production in a fusion device. Some particular pumping and vacuum systems will be delineated, as they are used for high power neutral particle injection systems in a fusion device. They highlight the peculiar requirements that are imposed by the harsh plasma environment on the vacuum production. The neutral particle balance and pressure development during plasma operation will briefly be depicted.