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icc2011_w7x_wurden_talk-1.pdf2011-08-10 17:58:32Glen Wurden
icc2011_w7x_wurden_paper.pdf2011-08-09 12:00:48Glen Wurden

US Collaboration on the W7-X Stellarator

Author: Glen Wurden
Requested Type: Consider for Invited
Submitted: 2011-06-09 09:30:15

Co-authors: D. Gates, J. Harris, H. Neilson, A. Lumsdaine, A. Simakov

Contact Info:
Los Alamos National Laboratory
PS Box 1663
Los Alamos, NM   87545

Abstract Text:
The new American-German collaboration on the W7-X stellarator in
Greifswald, Germany, is in its first year as an ICC project. Los Alamos, Princeton, and Oak Ridge have organized an effort centered on applications of 3D magnetic fields to improve the performance and design of toroidal confinement devices. In particular, presently we have three focus areas: providing copper error correction coils to be mounted externally on the W7-X cryostat, developing a scraper element for the divertor, and working control issues under the theme of 3D Diverted Plasmas. The error correction coils must be designed and built on a fast schedule, to meet assembly timelines. ORNL has recently contributed to the design of the support fixtures for the room temperature to cyrogenic coil connections. The LANL effort involves theoretical modeling of whether the stellarator bootstrap current depends on the radial electric field, and an experimental investigation (IR imaging) of the heat loading and wall interactions in the W7-X 3-dimensional divertor. W7-X is a modular niobium-titanium superconducting stellarator of the helias type, with 5-fold symmetry, and the outer vessel is 16 meters in diameter, not including port extensions. It is presently 4/5 assembled, with the last module being moved into place this year. There are more than 250 ports (being insulated and welded into place now), although only ~150 are available for diagnostics...i.e., 30 per sector. First plasma is scheduled for August 2014. Other opportunities for increased collaboration scope abound.

Characterization: A5,A6


University of Washington

Workshop on Innovation in Fusion Science (ICC2011) and
US-Japan Workshop on Compact Torus Plasma
August 16-19, 2011
Seattle, Washington

ICC 2011