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EAST

EAST. ASIPP. 第十三届全国等离子体科学技术会议， 2007 年 8 月 20 日 --23 日，中国成都. EAST 超导托卡马克 物理实验进展. 高 翔 中国科学院等离子体物理研究所 2007 年 8 月 20 日. EAST. Outline. ASIPP. Introduction EAST experimental setup Experimental results Next experimental plan Summary. Introduction. EAST.

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EAST

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  1. EAST ASIPP 第十三届全国等离子体科学技术会议，2007年8月20日--23日，中国成都 EAST超导托卡马克物理实验进展 高 翔 中国科学院等离子体物理研究所 2007年8月20日

  2. EAST Outline ASIPP • Introduction • EAST experimental setup • Experimental results • Next experimental plan • Summary

  3. Introduction EAST Main Parameters of the EAST NominalUpgrade Bo 3.5 T4.0 T IP1 MA1.5 MA Ro1.7 m 1.7 m a 0.4 m 0.4 m R/a 4.254.25 Kx1.2-1.51.5-2 δx0.2-0.30.3-0.5 Heating and Driving: ICRH 3 MW6 MW LHCD 3.5 MW8 MW ECRH 0.5 MW1.5 MW NBI8 MW Pulse length 1000 s Configuration: Double-null divertorSingle-null divertor 3

  4. EAST ASIPP The EAST machine assembly was completed in Jan. 2006. The first plasma discharge has been achieved successfully on the EAST in September 26, 2006. Single-null (SN) and double-null (DN) diverter plasma discharges have also been achieved successfully on the EAST tokamak in January of 2007.

  5. 1st experimental campaign in 2006 EAST March 2006: first engineering commission Middle of July: accomplishment of in-vessel components installation End of July: cooling down (60~80 K) 5 August: GDC discharge followed by RF plasmas for wall cleaning 20 September: cooling down ( magnets 4.5 K) 22 September: accomplishment of engineering test (TF –up to 3.55T). 23 September : null field configuration, break down with He 26 September 2006: 1st boronization, first hydrogen plasma, pre-programming controlled: Ip~220kA, t~2.7s 29 September : current feedback control 30 September: discharge break for testing spare turbines 2 October: 2nd boronization, density feedback control 5 October: current and radial position control, followed by Z control 8 October: 3rd boronization, Ip ~ 500 kA, (shaping preparation) 13 October 2006: elongated plasma (~1.28)

  6. EAST 2nd experimental campaign in 2007 20 December 2006: vacuum system start up 22 December: pumping of in-vessel vacuum 24 December: cooling down 9 January 2007: cooling magnets to 4.5 K 10 January 2007: PF coils & power supply system test 11 January: engineering test (TF coils + ICRF cleaning) 14 January 2007: break down with LHW (shot number 2729#) 17 January: pre-programming controlled: Ip~200kA limiter 3157# 18 January: feedback control of Ip~300kA limiter plasma 3231# 20 January 2007: IC coil test for vertical instability 3331# 22 January: Ip~200kA double-null divertor plasma 3478# 8 February 2007: double-null divertor plasma of Ip~500kA shaping during Ip ramp-up 4582# 9 February: long pulse 200kA/8.5s divertor plasma 4611#, optimization of low loop voltage (~ 3.5V) start-up 4654# 10 February: end of plasma experiment 4774# 11 February 2007: wall conditioning

  7. EAST Outline ASIPP • Introduction • EAST experimental setup • Experimental results • Next experimental plan • Summary

  8. EAST Plasma control system TokSys: Axisymmetric Plasma/ Conductor Models In collaboration with DIII-D team, GA Similar to DIII-D PCS, but with the EAST new features Blue:Delivered & Installed by GA Red: Provided by ASIPP

  9. EAST Stainless steel in-vessel components limiter LHW launcher ICRF antenna GDC anode

  10. EAST Plasma diagnostics system

  11. LHCD system (180 kW) EAST • 20 klystrons at 2.45 GHz with 100kW/each (2 MW) in CW are tested. • Launcher and transmission lines are designed and under fabrication. • Power supply has been completely installed. One set has been tested and used in HT-7. • Control and protection systems are being built.

  12. ICRF system (30 kW) EAST • 1.5 MW will be available (30~110MHz, first for HT-7). • The antenna is under construction. • The liquid stub has been fabricated and used in HT-7. • The phase shifter has been fabricated. • The transmission line has been fabricated. • The control and protection system is being built.

  13. Exp conditions in 2007 campaign (1) Full stainless steel in-vessel components, including liners, diverter plates, internal coils, RF antenna; (2) Two movable molybdenum (Mo) limiters installed at R = 2.235 m, with amax= 0.45 m; (3) About 15 basic diagnostics for first plasma study on EAST; (4) Plasma control system (PCS) built in collaboration with DIII-D; (5) RF systems at ICRF (30 kW) and at LHF (180 kW) for wall conditioning and discharge pre-ionization; (6) Wall conditioning: baking, GDC and RF discharges, boronization.

  14. 2007年春季EAST物理实验研究专题 • （1）等离子体基本性能评价； • （2）壁处理与PSI问题研究； • （3）等离子体启动中的物理； • （4）等离子体成形和稳定性； • （5）偏滤器基本特性； • （6）基本运行区与MHD.

  15. EAST Outline ASIPP • Introduction • EAST experimental setup • Experimental results • Next experimental plan • Summary

  16. EAST First plasma on EAST • After several breakdown shots, plasma current was very smoothly ramped up to 150 kA at a rate of about 0.5MA/s by pre-programmed control and up to 220 kA after only a few more shots. Circular cross-section H plasma with Mo limiter on Sept.26, 2006. • To avoid impurity burn through, plasma density was relatively low, about 0.4~1.01019/m2. Strong HXR was observed. • Most disruptions were due to the shift of plasma position. Even for the worst disruption, the induced voltage at the ends of the PF coils was very low due to the shielding effect of the vessel, safe for PF coils.

  17. Circular cross-section with Mo limiter

  18. 2007年春季EAST物理实验研究专题 • （1）等离子体基本性能评价； • （2）壁处理与PSI问题研究； • （3）等离子体启动中的物理； • （4）等离子体成形和稳定性； • （5）偏滤器基本特性； • （6）基本运行区与MHD.

  19. EAST RF wall condition on EAST ASIPP

  20. 2007年春季EAST物理实验研究专题 • （1）等离子体基本性能评价； • （2）壁处理与PSI问题研究； • （3）等离子体启动中的物理； • （4）等离子体成形和稳定性； • （5）偏滤器基本特性； • （6）基本运行区与MHD.

  21. Key issues for start up EAST • (1) Breakdown: null field, breakdown electric field, toroidal magnetic field, the pressureof operation gas • (2) Ramp-up: plasma position control, impurity, MHD instability

  22. Optimization of gas pressure EAST

  23. Optimization of null field EAST Vloop < 3V, Bt = 2T for breakdown

  24. Breakdown Vloop and dIp/dt ramp-up rate 3.5 V < Vloop < 6.5 V 0.1 MA < dIp/dt < 0.65 MA/s

  25. Start up with & w/o LHW EAST • In the break down phase (t<0.1 s), the difference of loop voltage is observed with and without the LH injection . • In the plasma current ramp-up phase (t>0.1 s), ramping rate was larger with the LH injection than without the LH injection.

  26. 2007年春季EAST物理实验研究专题 • （1）等离子体基本性能评价； • （2）壁处理与PSI问题研究； • （3）等离子体启动中的物理； • （4）等离子体成形和稳定性； • （5）偏滤器基本特性； • （6）基本运行区与MHD.

  27. Key issues for shaping EAST • (1) Plasma current Ip feedback control • (2) R, Z position feedback control • (3) Density feedback cortrol • (4) Shaping during Ip ramp-up phase: impurity MHD low vs flux • (5) Control of vertical instability by IC coil: elongation ~ 1.8

  28. Ip, R, Z feedback control EAST Iso-flux control will be done

  29. Plasma shaping during ramp-up ASIPP Ip ramp-up PF7+9 and PF8+10 coils preset for different shaping rate control

  30. Different shaping control test ASIPP

  31. EAST Vertical instability control by IC coils ASIPP

  32. Single-null diverted plasma EAST A single null plasma having elongation of kappa = 1.7 and delta = 0.64, EAST shot number 3743# @ Ip = 0.2 MA, Bt = 2 T, t = 3.2s ASIPP

  33. Double-null diverted plasma EAST A double null plasma having elongation of kappa = 1.8 and delta = 0.5, EAST shot number 3745# @ Ip = 0.2 MA, Bt = 2 T, t = 3.1s ASIPP

  34. 2007年春季EAST物理实验研究专题 • （1）等离子体基本性能评价； • （2）壁处理与PSI问题研究； • （3）等离子体启动中的物理； • （4）等离子体成形和稳定性； • （5）偏滤器基本特性； • （6）基本运行区与MHD.

  35. Divertor probes EAST

  36. 内靶板

  37. XUV 偏滤器位形，芯部XUV辐射减少 下偏滤器内靶板

  38. 4165# CCD Ha XUV 限制器位形，XUV辐射增强

  39. 限制器位形，杂质辐射增强

  40. 2007年春季EAST物理实验研究专题 • （1）等离子体基本性能评价； • （2）壁处理与PSI问题研究； • （3）等离子体启动中的物理； • （4）等离子体成形和稳定性； • （5）偏滤器基本特性； • （6）基本运行区与MHD.

  41. Operational region EAST ASIPP

  42. High <ne> = 4×1019m-3, fGW~1.4, Limiter ASIPP

  43. High <neL> = 3×1019m-2, DN divertor ASIPP

  44. Long pulse divertor plasma EAST ASIPP

  45. Long pulse (0.2MA/8.5s) 4611# EAST ASIPP

  46. Ip = 0.5 MA divertor plasma EAST ASIPP

  47. Ip = 0.5 MA divertor plasma (4582#) EAST ASIPP

  48. EAST Outline ASIPP • Introduction • EAST experimental setup • Experimental results • Next experimental plan • Summary

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