Hutch Neilson Princeton Plasma Physics Laboratory Stellarator Team Meeting 3 March 2011 Stellarator Program Update

Topics W7-X Collaboration Progress –W7-X Trim Coils –Physics / Control Topics (Gates’ talk) Upcoming visit to DOE-FES Upcoming visit to IPP-Greifswald FY-11 milestones Calendar Stellarator Team Meeting / 3 March 2011 / H. Neilson 2

Progress Highlights X-ray imaging crystal spectrometer is ready to ship to LHD. PPPL team will visit in April to install. The reconstruction tool for LHD is on schedule. Reconstructions using STELLOPT-VMEC are in progress. Detailed CAD models for W7-X trim coils have been developed. Analysis and fabrication planning are in progress. Responsibility for the supports reverts to IPP. W7-X physics collaboration plans have crystallized. Stellarator community presentation to DOE-FES was effective in explaining the science and its importance. Stellarator Team Meeting / 3 March 2011 / H. Neilson 3

Stellarator Budget Planning We have received preliminary guidance to plan on flat funding for the LHD and W7-X collaborations in FY-12. –Under the circumstances, this is positive! But, subject to change due to the extreme volatility in the Government budget process. Stellarator funds carried over from FY-10 will be exhausted in FY-11; we will have less to spend next year. Impacts not yet clear. In lieu of the usual FES budget planning meeting, FES will meet with labs individually to discuss budgets. PPPL is scheduled for April 11. Stellarator Team Meeting / 3 March 2011 / H. Neilson 4

24 th Symposium on Fusion Engineering Chicago, June 26-30, 2011 Stellarator Team Meeting / 3 March 2011 / H. Neilson 5 T. Brown, et al., “An Overview of Pilot Plant Designs Based on the Tokamak, Spherical Tokamak and Stellarator.” A. Lumsdaine, et al., “United States Contributions to Wendelstein 7-X.” K. Risse, et al., “Purpose and Design of Trim Coils for the Wendelstein 7-X Stellarator Experiment.” [Possible U.S. paper on the W7-X trim coils] J. Harris, “Three dimensional toroidal plasma confinement.” (invited) H. Neilson, “Roadmap to Fusion Energy.” (invited)

38 th EPS Conference on Plasma Physics Strasbourg, June 27 – July 1, 2011 Stellarator Team Meeting / 3 March 2011 / H. Neilson 6 Proposed N. A. Pablant, et al., “Layout and expected performance of the recently installed high-resolution x-ray imaging crystal spectrometer on the Large Helical Device.” S. Lazerson, et al., “Equilibrium Reconstruction on the Large Helical Device.”

Internal Tracking Milestones for FY-11 (1) X-ray imaging crystal spectrometer for LHD- N. Pablant will address –Complete assembly. –Jan –Ship to LHD. –Feb –Install on LHD. –t.b.d. Equilibrium reconstruction for LHD- S. Lazerson will address –Demonstrate LHD reconstruction w/ STELLOPT-VMEC. –March 2011 –Develop flux loop synthetic diagnostics, using EXTENDER. –March 2011 –Modification of PIES to allow Thomson pressure profile. –April 2011 –Modification of STELLOPT to utilize PIES and EXTENDER. –June 2011 –Speed PIES by improving parallelization. –July2011 –Demonstrate LHD reconstruction w/ STELLOPT-PIES. –August 2011 –Reconstruction tool complete (for LHD application). –September 2011 –Remove stellarator symmetry constraint from PIES Stellarator Team Meeting / 3 March 2011 / H. Neilson 7

Internal Tracking Milestones for FY-11 (2) General –Define W7X national work scope and budget.- Oct ✔ W7X Trim Coils –Approve & authorize project work plan, begin execution. –Jan ✔ –Project management plan issued for approval.– Jan draft review complete. Finalize at PDR –Complete preliminary design review.– April 2011 forecast April –Complete final design review.– June 2011 –Order conductor.– June 2011 –Order windings.– July 2011 Stellarator Team Meeting / 3 March 2011 / H. Neilson 8

Internal Tracking Milestones for FY-11 (3) W7-X Physics Control –Obtain modular/planar coils specs ✔ –Obtain W7-X sweep coil specifications - add to coils file. –Obtain W7-X magnetic diagnostics specs –Obtain 3D description of W7-X divertor –Begin VMEC+Extender calculations of divertor variation –Develop control scenarios Reconstruction –Rationalize V3FIT with STELLOPT –Complete initial LHD PIES reconstruction –Begin development of W7-X implementation of the reconstruction code (Lazerson, Reiman) Stellarator Team Meeting / 3 March 2011 / H. Neilson 9

Calendar 31 Mar.Stellarator team meeting Apr. Trim Coil PDR 28 Apr.Stellarator team meeting 26 MayStellarator team meeting June?Trim Coil FDR (t.b.a.) JuneSOFE Conference, Chicago 27Jun. - 1 Jul.EPS Meeting, Strasbourg Stellarator Team Meeting / 3 March 2011 / H. Neilson 10

Agenda Stellarator Team Meeting / 3 March 2011 / H. Neilson 11 Agenda 1:30Program Update, Announcements, etc. - H. Neilson 1:50FY-11 Planning & Status Reports 1.1 / 1.6 / 2.0 Physics planning update, progress vs. milestones (D. Gates) 2.2 XICS Spectrometer (N. Pablant) 2.3 Equilibria at high beta / reconstruction (S. Lazerson) 2:50Summary Task Reports (≤5 mins. each, slides optional) 1.2 Status of W7-X Trim Coil Project (H. Neilson, T. Brown) 1.3 Status of W7-X Scraper Element planning (A. Lumsdaine, J. Harris) 1.4 Status of IR Camera work (G. Wurden) 3:30Adjourn