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Discussions and Summary for Session 1 ‘ Transport and Confinement in Burning Plasmas’

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

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Discussions and Summary for Session 1 ‘ Transport and Confinement in Burning Plasmas’

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

  2. Burning Plasmas • Scientific importance and interest • Plasma confinement and stability at large scale (small *) • High energy  particles effects on MHD, equilibrium and confinement • Strong coupling between pressure and heating (self-heating) • Plasma boundary and material interaction • Control and mitigation of disruption, NTM, RWM, STO, ELM, and …. • Technological importance and interest • Integration of present technologies • Tritium processing and inventory • High heat flux • Remote handling • Blanket technology • Diagnostic and Control of self-organized plasma

  3. D-T Experiment • D-T experiments were performed in JET and TFTR

  4. Alpha heating without MHD •  particles are well confined • Classical slowing down of  • Electrons are heated by  particles

  5. Plasma confinement and stability at large scale (small *) • Beta degradation of ITER confinement scaling • Isotope effect on confinement varied depending on operating regime • Pedestal structures • … • At the large scale plasma • Does the confinement change? • Will turbulent transport studies both experimental and theoretical help? • Does the stability change?

  6. High energy  particles effects on MHD, equilibrium and confinement • High energy  particles destabilize some instabilities and stabilize another instabilities. • TAE, STO modifies the  distribution. Is it a severe loss or redistribution of  particles? • No-linear analysis and comprehensive measurements are necessary for the further understandings • How the effects on equilibrium?

  7. Strong coupling between pressure and heating (self-heating) • There are some limitation of present burning plasma simulation experiments. It will help our understandings. • Is it possible to control AT plasmas • Other experiment? • More comprehensive predictive simulation codes will be necessary. • Strategy for the developments? • Transport, High energy, MHD, Stability, Divertor and SOL

  8. Plasma boundary and material interaction • High heat flux by ELMs -> ELM mitigation • Tritium retention in graphite. The method of tritium removal? High Z material? • Wall conditioning?, Wall saturation (controlled by divertor pumping)?

  9. Control and mitigation of disruption, NTM, RWM, STO, ELM, and …. • Disruption -> damage to the machine. Is it possible to know the operational margin by a real time calculation? • NTM control <- profile of pressure and current control. ECH will work (jEC>jBS). • RWM control <- external coil system will work. Does plasma rotation control necessary? • STO -> affect a distribution, impurity accumulation • ELM control by shape, rotation, external coils, pellets and etc. JT-60U Example

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