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Introduction to fusion control

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  1. Introduction to fusion control Tony Donné

  2. Control is a central issue in fusion • Research in present devices points strongly towards need for advanced control • Simultaneous control of multiple (profiles of) plasma parameters • Real-time control of a large number of parameters with a limited set of actuators • Profile control in the presence of dominant alpha heating • Control signals for feedback on one parameter derived from multiple diagnostics • Intelligent control taking account of the instrumental response functions A.J.H. Donné, Control for Nuclear Fusion, 7/8 May 2008 2/9

  3. Control is a central issue in fusion • Let’s look at ITER measurements to illustrate this A.J.H. Donné, Control for Nuclear Fusion, 7/8 May 2008 3/9

  4. Conclusion The more advanced the operating scenarios, the more parameters need to be controlled A.J.H. Donné, Control for Nuclear Fusion, 7/8 May 2008 4/9

  5. P. Politzer et al., ITPA meeting Lisbon 2004


  6. The (hopefully not too) far future: DEMO • Only 1-2 operating scenarios • Smaller number of measurements/diagnostics • Advanced predictive/analysis codes to combine data from various diagnostics in an intelligent way are needed to reduce the number of required diagnostics. Experience with this should be gained on ITER • Experience on ITER may guide the selection of techniques that can best cope with the harsh environment • During ITER life time experience should be gained with real-time data handling and validation to process large quantities of data, in-pulse calibration, etc. A.J.H. Donné, Control for Nuclear Fusion, 7/8 May 2008 6/9

  7. DEMO: no Diagnostic Neutral Beam? • In case the data obtained in ITER with the DNB (He-ash, Ti, vrot, Bp, etc.) are important for DEMO, techniques and hardware should be developed to obtain the same info without beam • E.g., is it possible to use measurements of He near the edge to control the He ash? A.J.H. Donné, Control for Nuclear Fusion, 7/8 May 2008 7/9

  8. This workshop • Position and shape control • Equilibrium, stability • Profile control • Performance boosting, plasma tailoring • MHD control • Stability, ‘controlability’ (i.e. tolerable ELMs) • Integrated scenarios A.J.H. Donné, Control for Nuclear Fusion, 7/8 May 2008 8/9

  9. I wish you all a very interesting workshop A.J.H. Donné, Control for Nuclear Fusion, 7/8 May 2008 9/9