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Proposals for Next Year's MFE Activities: Analyzing H-mode and L-mode Plasma Edge Conditions

This proposal outlines essential activities for next year's MFE initiatives, focusing on the edge plasma conditions in H-mode and L-mode, specifically addressing the differences in MHD stability and bootstrap current driven by edge pressure gradients. It emphasizes the need for self-consistent analysis of H-mode edge conditions to understand their impact on current drive and divertor performance. The document advocates for system code upgrades to ensure accurate modeling based on actual plasma geometry, establishing a clear framework for optimizing critical parameters and enhancing plasma performance.

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Proposals for Next Year's MFE Activities: Analyzing H-mode and L-mode Plasma Edge Conditions

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  1. Proposals for Next Year’s MFE Activities C. Kessel, PPPL ARIES Project Meeting, Sept. 24, 2000

  2. Experimental H-mode Edge

  3. L-mode vs H-mode Plasma Edge Assumptions • ARIES has consistently assumed L-mode like plasma edge conditions -- low T, low finite n, dp/dy = 0 • Some form of ELMing H-mode might be present -- higher T, higher finite n, dp/dy finite, pressure pedestal inside separatrix • We’d like to analize a range of H-mode edge conditions self-consistently with bootstrap current to assess the impact on MHD stability, CD, and radiation/divertor

  4. H-mode edge and Ideal MHD /Current Drive • L-mode vs H-mode affects ballooning and kink stability • Bootstrap current is driven by dp/dy near plasma edge and affects required CD • These depend on the precise model of p(y)

  5. H-mode Edge and Plasma Radiation/Divertor • The ELMing H-mode must have specific characteristics to be acceptable for a power plant divertor (high frequency, low energy amplitude) • The plasma edge conditions should be compatible with the divertor (low T, and high n) • Plasma radiation from this edge region would be affected by T and n assumed and would need to be consistent with power balance and engineering limitations

  6. Systems Code Upgrades • Prefer that all physics quantities be based on actual plasma geometry, so have them done in the equilibrium calculation (JSOLVER) • Graphics (internal and/or external) • Determine what type of systems analysis we want to do -- scans or optimization or both, and what the fundamental quantities are that we search over

  7. Systems Code Upgrades • Keep present systems flow ; plasma parameters and geometry--> build machine around plasma--> cost machine • Still require detailed analysis outside systems code (MHD, RFCD, divertor, neutronics, thermal, etc.) • Find best way to optimize over parameters we care about (R, a, T, Zeff, b, Bt, Iw, etc.)

  8. Systems Code Upgrades • Break this task into phases or it will become overwhelming • Create dump file from JSOLVER that ASC can read • Get JSOLVER boundary and ASC PF coil system to work • Later attempt to integrate equilibrium into ASC • Graphics can be done separately • Examine scan/optimization strategies • Consider using SUPERCODE

  9. Other Studies • Examine conventional aspect ratios, R/a = 2.5-5.0 to determine physics optimization • Develop startup simulation of ARIES-AT with TSC • Examine no-wall reverse shear configuration to make connection between ARIES and NSO/present experiments

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