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NCSX Research Mission: Advancing Compact Stellarator Science

Acquire physics data for assessing compact stellarator attractiveness, understand 3D fusion science goals and demonstrate high-beta, disruption-free operation. Research phases planned for comprehensive exploration. Collaborative national effort with meticulous preparation for successful operation.

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NCSX Research Mission: Advancing Compact Stellarator Science

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  1. NCSX Mission Acquire the physics data needed to assess the attractiveness of compact stellarators; advance understanding of 3D fusion science. (FESAC-99 Goal) Understand… • Beta limits and limiting mechanisms in a low-A current carrying stellarator • Effect of 3D fields on disruptions • Reduction of neoclassical transport by QA design. • Confinement scaling; reduction of anomalous transport by flow shear control. • Equilibrium islands and neoclassical tearing-mode stabilization by choice of magnetic shear. • Compatibility between power and particle exhaust methods and good core performance in a compact stellarator. • Alfvenic-mode stability in reversed shear compact stellarator Demonstrate… • Conditions for high-beta, disruption-free operation

  2. NCSX Research will Proceed in Phases Planned as: • Initial operation - shake down systems • Field Line Mapping • Ohmic • Auxiliary Heating - (3MW NBI, PFC liner) • Confinement and High Beta - (~6 MW, 3rd gen. PFCs) • Long Pulse – (pumped divertor) • Diagnostic upgrades throughout to match research goals • Phases IV – VI may last multiple years. (equipment included in project cost-TEC)

  3. Timeline for Initial Research & Preparation

  4. Checkout Phases

  5. III. Ohmic

  6. IV. Auxiliary Heating

  7. V. Confinement and High Beta

  8. VI. Long Pulse

  9. Preparation for Experiments Before operation (FY2003-07), need to do long-term development to prepare for operation • Development of discharge control strategy & algorithms • Design and begin fabrication of long-lead diagnostic upgrades for Phase III and IV. • Develop improved edge models, apply them to design Phase IV PFCs • Finish modeling and design for internal trim coils for Phase IV. • Conceptual design of low-power RF loading study, for Phase IV. Similar to approach used for NSTX

  10. Preparation for NCSX Research Team NCSX will be operated as a National Collaboration, including members from many institutions Plan to start Research Forums in FY2005/06 to • Identify groups interested in developing needed diagnostics • Nucleate the research team • Develop detailed research plans and responsibilities Similar to approach used for NSTX. During the fabrication period: NCSX will collaborate with existing US & International stellarators on topics of mutual interest, to debug analysis methods, and prepare potential team. • Already started…

  11. Summary • NCSX’s mission is to acquire knowledge needed to assess compact stellarator concept, particularly passive stability and resistance to disruptions at high beta. • NCSX offers novel tools to explore 3D shaping effects on stability, transport, exhaust problems for fusion science. • Research program for accomplishing mission and exploiting tools has been developed. • Diagnostic measurement needs have been identified. (Charge 5 & PVR) • Research preparation is needed during NCSX construction to develop the analysis tools and upgrades, and to assemble the research team needed to carry out the mission. (Charge 5)

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