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Recent Experimental Results on HL-2A

8th General Scientific Assembly  of the Asia Plasma and Fusion Association in 2011 . SWIP. Recent Experimental Results on HL-2A. HL-2A Team presented by X.T. Ding Southwestern Institute of Physics, Chengdu, China In collaboration with USTC, ASIPP,…China CEA-IRFM, France IPP, Germany

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Recent Experimental Results on HL-2A

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  1. 8th General Scientific Assembly  of the Asia Plasma and Fusion Association in 2011  SWIP Recent Experimental Results on HL-2A HL-2A Team presented by X.T. Ding Southwestern Institute of Physics, Chengdu, China In collaboration with USTC, ASIPP,…China CEA-IRFM, France IPP, Germany University of California at San Diego, USA NIFS, JAEA, Kyoto University,…Japan NFRI, WCICenter for Fusion Theory, Korea IPR, India Gullin China 2011.11.1 Southwestern Institute of physics, Chengdu, Sichuan, 610041 E-mail:dingxt@swip.ac.cn APFA2011

  2. Outline • Status of the HL-2A Tokamak • Resent Experiments on HL-2A • Summary & Next plan • Progress of H-mode study • H-mode with high power ECRH • ELMy mitigation with SMBI/CJI • ELMy free/Q H-mode observation • Plasma tansport study • Particle transport during high power ECRH • New non –local phenomena • Edge turbulens study • ZF/GAM during ECRH • Profile of the ZF/GAM intensity

  3. Status of the HL-2A Tokamak • R: 1.65 m • a: 0.40 m • BT:2.7 T • Ip:450 kA • ne:~ 6.0 x 1019 m-3 • Te:> 4.0 keV • Ti:> 2.0 keV • Duration: ~4.3 s Configuration: • Limiter, LSN divertor Auxiliary heating systems: ECRH/ECCD: 3 MW (60.5 MW/68 GHz/1 s) NBI: 1MW/45 keV/2 s LHCD: 1 MW (2 0.5 MW/2.45 GHz/1 s) Fueling systems (H2/D2, He/Ne/Ar): Gas puffing(LFS, HFS, divertor) Extruded PI(40 pellets/LFS,) SMBI (LFS,HFS):

  4. 1# 6# 2# 4# 3# 5# Heating system on HL-2A • ECW injected into the HL-2A from low field side • 6 sets of gyrotrons (4/68GHz/500kW/1s and 2/68GHz/500kW/1.5 s ) • Modulation: frequency is 10~50 Hz; duty cycle is 10~100 % • Antenna for four wave beams • A fixed focusing mirror；

  5. SMBI systems on HL-2A Fueling system on HL-2A Fueling systems : Gas puffing(LFS, HFS, divertor) SMBI/CJI (LFS,HFS): Extruded PI(40 pellets/LFS) • The HFS fuelling efficiency is higher than LFS • The penetration depth of the CJI is deeper than SMBI

  6. SWIP APFA2011 • Status of the HL-2A • Resent Experiments on HL-2A • Summary & Next plan • Progress of H-mode study • H-mode with high power ECRH • ELMy mitigation with SMBI/CJI • ELMy free/Q H-mode observation • Plasma tansport study • Particle transport during high power ECRH • Non –local phenomena • Edge turbulens study • Results for zonal flows • Results for blobs

  7. WE(kJ) Ip(kA) ECRH Te(a.u.) From ECE Ne (19E19m-3) Ha (edge) Ha (div) NBI Time(ms) H-mode with high power ECRH The Operation range of H-mode • Parameter range • BT: 1.2-2.7 T • Ip: 130_350 kA • Ne:1.5-3.5 x 1019 m-3 • WE:> 80kJ

  8. r/a~0.6 r/a~0.8 (a) (b) (c) H-mode with type-I ELMs • Some large ELMs have periods of 10-30 ms with energy loss more than 10 % • large ELMs have obvious perturbation to plasma current, Te and ne at plasma edge as well The Spectrogram of the ELM precursors from magnetic probe (LFS) and soft-X ray (edge channel). The divertor Dα indicates the onset of ELM.

  9. 3/2 NTM during ELMy H-mode m/n=3/2 survives m/n=2/1 is suppressed Ip=300kA,Bt=2.4T, ne~3×1019m-3 PECRH~1.5MW, PNBI~0.8MW βN (onset) ~0.7

  10. ELMy mitigation with SMBI/CJI • The frequency of the ELMy increases with SMBI • The amplitude of the ELMy decreases with SMBI

  11. ELMy mitigation with SMBI/CJI • Density gradient of the pedestal is decrease after SMBI • The frequency of the ELM depends on pulse wide and gas presure of the SMBI • Compare to the general gas puffing, the recycling is improved

  12. Observation of ELMy free/QH-mode We Ip Da ECRH NBI Te(core) Te(edge) Ne • After asmall disruotion, • The stored energy of the plasma increase about two times • The temperature and density increase, • Da decrease both in diaverter and at the plasma edge.

  13. Observation of ELMy free/QH-mode m/n=3/2 m/n=3/1 m/n=2/1 • The density profiles during forming of the pedestal measured by microwave reflectometry • Signals of the Mirnov coils and soft x ray. • m/n=3/1 EHO??

  14. Observation of ELMy free/QH-mode

  15. SWIP APFA2011 • Status of the HL-2A • Resent Experiments on HL-2A • Summary & Next plan • Progress of H-mode study • H-mode with high power ECRH • ELMy mitigation with SMBI/CJI • ELMy free/Q H-mode observation • Plasma tansport study • Particle transport during high power ECRH • Non –local phenomena • Edge turbulens study • Results for zonal flows • Results for blobs

  16. Particle transport during ECRH • The particle transport studied with modulated ECRH • The particle transport is difference in divertor and limit configuration

  17. Out-gassing (Outward) Out-gassing Out-gassing (Inward) Pump-out a=37 cm D= 1.5m2/s V= -10m/s D= 0.4m2/s V= -4m/s D= 0.8m2/s V= 15m/s Pump-out Particle transport during ECRH • The out gassing is dominated in the limit configuration • The pump out is dominated in the divetor configuration Zou Xiaolan, et.al. 23rd FEC, EXC/P8-14

  18. Non –local phenomena • The non local phenomena have been observed after switch-off the far off-axis ECRH • The sustained time of the non local phenomena with continue SMBI is about 5 times of the confinement time (>100ms) H.J.Sun tobe published to Nuclear Fusuion Z.B. Shi, 23rd FEC, EXC/P8-14

  19. Non –local phenomena MR measurements show: • The turburlence decrease after ECRH switch off; • The low freguency spectra and the poloidal corelation increase ; • Transport decreases

  20. SWIP APFA2011 • Status of the HL-2A • Resent Experiments on HL-2A • Summary & Next plan • Progress of H-mode study • H-mode with high power ECRH • ELMy mitigation with SMBI/CJI • ELMy free/Q H-mode observation • Plasma tansport study • Particle transport during high power ECRH • Non –local phenomena • Edge turbulence study during ECRH • ZF/GAM during ECRH • Profile of the ZF/GAM intensity

  21. Edge turbulence study during ECRH • The intensities of LFZF and GAM both increase with ECRH power • The intensities of LFZF decrease and GAM increase with the factor q (from 3.5 to 6.2) K.J. Zhao, 23rd FEC, EXC/7-3 A.D. Liu, PRL. 103 (2009) 095002

  22. Coexistence GAM dominant Edge turbulence study during ECRH • Moving from the last close flux surface inwards, the intensity of GAM first goes up, then decreases. • The intensity of LFZF increases inwards

  23. Summary • H-mode operate in high parameter ranges with high power ECRH and NBI. The plasma stored energy larger than 80kJ. During the H-mode, the type-I ELMs and NTM can be observed • The obvious ELMy mitigation has been achieved by means of SMBI/CJI. • ELMy free or QH-mode can be observed after a small disruption. The temperature increase greatly. • During the ECRH, the particle transport is difference in diavetor and limit configuration. The pump out is dominated in the diavetor configuration. • The sustained time of the non local phenomena with continue SMBI is about 5 times of the confinement time (>100ms)

  24. Summary • The non local phenomena have been observed after switch-off the far off-axis ECRH. The turbulence decrease after ECRH switch off, The low frequency spectra and the poloidal corelation increase. • The LFZF and GAM power tends to coexist in the inner region and GAM dominates near the LCFS. • The intensities of LFZF and GAM both increase with ECRH power. The intensities of LFZF decrease and GAM increase with the factor q (from 3.5 to 6.2)

  25. Next plans • To develop a new NBI system with 2MW; • To develop 140GHz ECRH/ECCD system with 2MW power; • To develop 3.7GHz LHCD system with 2MW power; • To design the RMP coils for ELMs control; • To develop new diagnostics for current profile measurement (MSE, Faraday rotation) and plasma rotation (CXRS).

  26. SWIP APFA2011 Thank you for your attention

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