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Multi-scale turbulence experiment in HT-7 takamak

Multi-scale turbulence experiment in HT-7 takamak. Institute of plasma physics.Chinese academy of sciences. Li Yadong Li Jiangang Zhang Xiaodong Ren Zhong Zhang Tou Lin Shiyao and HT-7 Team. IFTS work shop (Hangzhon september 25~26 2007). DIII-D new results in 21 th IAEA.

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Multi-scale turbulence experiment in HT-7 takamak

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  1. Multi-scale turbulence experiment in HT-7 takamak Institute of plasma physics.Chinese academy of sciences Li Yadong Li Jiangang Zhang Xiaodong Ren Zhong Zhang Tou Lin Shiyao and HT-7 Team IFTS work shop (Hangzhon september 25~26 2007)

  2. DIII-D new results in 21th IAEA Tore supra results in 21th IAEA

  3. The reverse result published by DIII-D and Tore Supra groupsThe key is looking for new fluctuation component in ETG mode range and find its correlation with electron heat transport

  4. High-k fluctuation measurement • k=ak+ bkr DIII-D:micro-waves scattering system(k=0~1;8~15;35~40 cm-1) (3 channels) Tore Supra: Doppler reflectometry (k=3~20cm-1) AUG: Doppler reflectometry (k=3~20cm-1) • kr NSTX: micro-waves scattering system (kr=4~24cm-1) (5 channels) • k HT-7: co2laser scattering system (k=12~34cm-1) (3 channels) plan: five & six channel (k =6~12cm-1,1~2 channels ,heterodyne detection; k=14~34cm-1 ,4 channels, homodyne detection) Tore Supra: (plan) co2 laser scattering system (k=6~25cm-1,1 channel )

  5. Turbulence wave-number spectra observed in Tore Supra by Doppler ReflectometryP.Hennequin12th EU-US TTF Marseille September 2006 Overview of recent electron heat transportF. Imbeaux12th EU-US TTF Marseille September 2006

  6. CO2 Laser collective scattering system in HT-7

  7. HT-7 Normalize S(k) spectra experiment in HT-7 NSTX Tore Supra Hennequin et al. PPCF 46, 2004

  8. HT-7 Special normalize S(k) spectra

  9. HT-7

  10. HT-7 compare

  11. T. Görler, 5th July 2007 11/20 Plasma microturbulence: Multiple scales ETG modes trapped electron modes Not shown here: - drift waves - ballooning modes ITG modes Question for theory: What is the role of sub-ion scales?

  12. model transform during ne ramp down experiment HT-7

  13. The narrowband fluctuation component in HT-7 (ρS~1.3±0.2mm) HT-7 Vph ~ 0.62810 5cm/s Vph~ -0.816105 cm/s

  14. HT-7 The violent instability erupted in low hybrid current drive experiment ΔPLHCD138138kw

  15. Δn e0.81019m-3

  16. HT-7 The violent instability erupted was watched in medium and high k density fluctuation (k=14cm-1 k=23cm-1 ) in low hybrid wave drive experiment . We found there is a critical value that correlation with LHCD power and plasma density in HT-7. We didn’t find strong correlation with energetic particle. Overview of recent electron heat transportF. Imbeaux12th EU-US TTF Marseille September 2006

  17. HT-7 Up and down anti-symmetry in density fluctuation measurement K3=23cm-1 K2=20cm-1 K1=14cm-1

  18. Next work HT-7 Systemic study anti-symmetry adjust ki=5927.5cm-1 k=ks-ki=8~35cm-1 =0.0773 o~0.338o↔8~35cm-1 ki ks k K1 K2 K3

  19. HT-7 Plasma current ramp up and ramp down experiment

  20. HT-7

  21. HT-7 Plasma density ramp up and ramp down experiment

  22. HT-7

  23. In plasma density slow ramp up and ramp down experiment we find little change in density fluctuation measurement .But in plasma current slow ramp up and ramp down experiment we find a change in density fluctuation measurement.That is Te profile change ?

  24. HT-7 Particle confinement and density fluctuation high frequency part

  25. HT-7 Narrowband fluctuation changed with the wavenumber spectrum

  26. HT-7

  27. Next work for GEA mode experimentIn HT-7 tokamak Change the area that main laser beam cross with local oscillator beams

  28. appendix The way of study fluctuations in tokamak The source of free energy which drives fluctuations is believed To be n、B、T. Many types of fluctuation with a different Spatial scale exist plasmas.the ion and Electron channel could be regulated by Different types of fluctuation with Interactions of such fluctuation n(r) Te(r) Ti(r) J(r) q(r) E(r) …. Transport: Ion thermal Electron thermal Electron particle momentum adjust simulation Fluctuation Spatial scale experiment external perturbation heating …. • Poloidal flow shear • Negative magnetic shear • Effect of normalized • pressure gradient • ……. Fluctuation in K resolution

  29. s0.1cm

  30. Thank you for your attendance

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