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Advancing Burning Plasma Physics and Simulation: Roadmap for Transport and Confinement

This workshop aims to discuss the current understanding and future goals in the field of transport and confinement in burning plasmas. Key topics include empirical scaling laws, control techniques, turbulence measurements and simulations, and wall conditioning. The roadmap focuses on developing predictive capabilities, improving empirical scalings, validating codes, and conducting comparative experiments to establish a predictive understanding of various operating regimes. Furthermore, the workshop explores the role of wall conditioning and choice of first wall materials in plasma performance and extends the study of SOL, divertor, and PMI effects to the core.

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Advancing Burning Plasma Physics and Simulation: Roadmap for Transport and Confinement

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  1. IEA Large Tokamak Workshop (W60) Burning Plasma Physics and Simulation Tarragona, Spain July 4-5, 2005 Roadmap ‘where are we?, where do we want to go?, how do we get there? for Session 1 ‘Transport and Confinement in Burning Plasmas’

  2. Where are we? • Useful empirical scaling law for ELMy H-mode. • Empirical scaling of b, n*or n/nGW, isotope, L-H transition, and pedestal scalings needs further work; • No information on rotation scaling, and little information on light (fuel-ion and helium ash) particle transport scaling. • Extrapolation for other operating modes requires more detailed understanding of transport processes. • Requirements of ITB formation and sustainment, in particular lack of benchmark integrated transport model to optimize performance. • Control pressure profile to optimize performance • New electron-scale turbulence diagnostics are coming on-line and beginning to be compared the turbulence models. • Understanding of ion-scale turbulence is making progress • Wall conditioning is important in affecting confinement improvement.

  3. Where do we want to go? • Develop predictive capability beyond empirical scalings that are experimentally established. • Identify and optimize control techniques for optimized performance. • Establish the relationship between turbulence measurements and simulations. • Establish improved empirical scalings for ELMy H-mode • L/H transition scaling; • b,r*,n*, isotope, pedestal and rotation scaling for both energy and fuel-ion transport. • Deeper understanding of wall conditioning and choice of first wall material on improved confinements.

  4. How do we get there? • Develop predictive capability: • Compare profile and fluctuation data with hierarchy of codes to validate and establish the codes. • Develop and test fluctuation diagnostics on existing experiments, which can be used on ITER. • Increase the range of k and kr for turbulence measurement. • For the ELMy H-mode: • increase confidence for L/H transition, pedestal, energy confinement and light ion transport scaling with b,r*,n* isotope, and rotation by well diagnosed experiments utilizing multi-machine comparisons (pay particular attention to matching edge conditions such as TF ripple) • For modes with ITBs: • agree on the ground rules for comparison of these operating regimes between different machines; • using these ground rules perform comparative experiments and establish a predictive understanding of criteria for onset and stable evolution of the ITB; • carry out scaling studies of access threshold, and dimensionless parameter scalings of energy and light ion particle confinement; • establish the robustness of these regimes against impurity, He ash accumulation and disruptive instability. • Extend the study of SOL, divertor, PMI and their effects to core. • Address the role of wall conditioning and choice of first wall materials in plasma performance and how they extrapolate to ITER. • Develop two or three dimensional measurements for SOL and divertor, and integrated modeling.

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