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Francisco A. Calderon University of Warwick

Francisco A. Calderon University of Warwick. Outline. Brief introduction to fusion High confinement and instabilities: ELMs What is needed for?  ITER … demo Description and results Further work. Section 1. Brief introduction to Fusion. Controlled thermonuclear fusion reactions.

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Francisco A. Calderon University of Warwick

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  1. Francisco A. Calderon University of Warwick

  2. Outline • Brief introduction to fusion • High confinement and instabilities: ELMs • What is needed for?  ITER … demo • Description and results • Further work

  3. Section 1 Brief introduction to Fusion Controlled thermonuclear fusion reactions Inertial confinement Magnetically confined plasma Tokamak Stellerator

  4. High confinement: ELMs 1Asdex-Upgrade tokamak

  5. Why do we need to study ELMs?

  6. ITER • Is a Tokamak • Lab for burning plasma • Prove DEMO feasibility • Been built in: • Caradache, Les Bouches du Rhône, southernFrance. • Further info: www.iter.org • Check for ITER newsletter!

  7. Section 3 Work andResults

  8. Experimental data

  9. Analysis • Use time ocurrence(see figure) as new time series {tn}. • We define the inter-ELM time interval as [6]: • dtn= tn – tn-1. • Construct delay plots. • Make PDF of the inter- ELMs time intervals.

  10. Delay plots • Are not a phase space reconstruction as we used here • Example: single pendulum, with a period p.

  11. Threshold scheme There are a few ELMs per time series, and they ranges from 67 - 196.

  12. Gas puffing rate Reproduced from Calderon et al. (2013) [9]

  13. First set with lower gas puffing rate Reproduced from Ref. [9]

  14. Second set with higher gas puffing rate The population in the sharp peak increases with the gas puffing rate. Reproduced from Ref. [9]

  15. Conclusions

  16. Section 4 Further Work • Webster et al. (2013)has recently found signs of Resonant behaviour in JET plasmas. - We see this as Stripes on Delay plots • Are ELMs coupling with Coils?

  17. Why is this been seen now?

  18. The End

  19. References • [1] A Loarteet al., Plasma Phys. Control. Fusion 45, 1549 (2003) • [2] K Kamiyaet al., Plasma Phys. Control. Fusion 49, S43 (2007) • [3] R J Hawryluk et al., Nucl. Fusion 49, 065012 (2009) • [4] www.iter.orgRetrieved 15th june 2013. • [5] J Greenhough, S C Chapman, R O Dendy, and D J Ward, Plasma Phys. Control. Fusion 45, 747 (2003) • [6] T Schreiber and A SchimdtPhysicaD 142346–382, (2000) . • [7] A Degeling, Y Martin, P E Bak, J B Lister, and X Llobet, Plasma • Phys. Control. Fusion 43, 1671 (2001) • [8] Webster et al. “Time-resonant tokamak plasma edge instabilities?” (2013), In press. • [9] F A Calderon, R O Dendy, S C Chapman, A J Webster, B Alperet al., Phys. Plasmas 20, 042306 (2013)

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