1. 1 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, WCI Center for Fusion Theory, Korea IPR, India Gullin China 2011.11.1 SWIP 8th General Scientific Assembly of the Asia Plasma and Fusion Association in 2011 APFA2011 Southwestern Institute of physics, Chengdu, Sichuan, 610041 E-mail:dingxt@swip.ac.cn

2. 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. 3 Status of the HL-2A Tokamak R:1.65 m a:0.40 m B T :2.7 T I p :450 kA n e :~ 6.0 x 10 19 m -3 T e :> 4.0 keV T i :> 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 (H 2 /D 2, He/Ne/Ar): Gas puffing (LFS, HFS, divertor) Extruded PI (40 pellets/LFS,) SMBI (LFS,HFS):

4. 4 5# 3# 4# 6# 2# 1#  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 % Heating system on HL-2A Antenna for four wave beams A fixed focusing mirror ；

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

6. 6 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 SWIPAPFA2011

7. 7 The Operation range of H-mode Parameter range  B T : 1.2-2.7 T  Ip: 130_350 kA  Ne: 1.5-3.5 x 10 19 m -3  W E :> 80kJ Time(ms) WE(kJ) Ip(kA) ECRH Te(a.u.) From ECE Ne (19E19m-3) Ha (edge) Ha (div) NBI H-mode with high power ECRH

8. 8 H-mode with type-I ELMs r/a~0.6 r/a~0.8  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 (a) (b) (c) 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. 9 I p =300kA,B t =2.4T, n e ~3 ×10 19 m -3 P ECRH ~1.5MW, P NBI ~0.8MW β N (onset) ~0.7 3/2 NTM during ELMy H-mode m/n=3/2 survives m/n=2/1 is suppressed

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

11. 11  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 ELMy mitigation with SMBI/CJI

12. 12 Observation of ELMy free/QH-mode 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. We Ip Da ECRH NBI Te(core) Te(edge) Ne

13. 13  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?? Observation of ELMy free/QH-mode m/n=3/2 m/n=2/1 m/n=3/1

14. 14 Observation of ELMy free/QH-mode

15. 15 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 SWIPAPFA2011

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

17. 17 Out-gassing Pump-out D= 1.5m 2 /s V= -10m/s Out-gassing (Outward) D= 0.4m 2 /s V= -4m/s Pump-out a=37 cm D= 0.8m 2 /s V= 15m/s Out-gassing (Inward)  The pump out is dominated in the divetor configuration  The out gassing is dominated in the limit configuration Zou Xiaolan, et.al. 23rd FEC, EXC/P8-14 Particle transport during ECRH

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

19. 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. 20 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 SWIPAPFA2011

21. 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. 22 GAM dominant Coexistence  Moving from the last close flux surface inwards, the intensity of GAM first goes up, then decreases.  The intensity of LFZF increases inwards Edge turbulence study during ECRH

23. 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. 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. 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. 26 Thank you for your attention SWIPAPFA2011