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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

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


Outline

EAST

Outline

ASIPP

  • Introduction

  • EAST experimental setup

  • Experimental results

  • Next experimental plan

  • Summary


East

Introduction

EAST

Main Parameters of the EAST

NominalUpgrade

Bo3.5 T4.0 T

IP1 MA1.5 MA

Ro1.7 m1.7 m

a0.4 m0.4 m

R/a4.254.25

Kx1.2-1.51.5-2

δx0.2-0.30.3-0.5

Heating and Driving:

ICRH3 MW6 MW

LHCD3.5 MW8 MW

ECRH0.5 MW1.5 MW

NBI8 MW

Pulse length1000 s

Configuration:Double-null divertorSingle-null divertor

3


East

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.


East

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)


East

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


Outline1

EAST

Outline

ASIPP

  • Introduction

  • EAST experimental setup

  • Experimental results

  • Next experimental plan

  • Summary


Plasma control system

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


Stainless steel in vessel components

EAST

Stainless steel in-vessel components

limiter

LHW launcher

ICRF antenna

GDC anode


Plasma diagnostics system

EAST

Plasma diagnostics system


East

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.


East

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.


East

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.


2007 east

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.


Outline2

EAST

Outline

ASIPP

  • Introduction

  • EAST experimental setup

  • Experimental results

  • Next experimental plan

  • Summary


First plasma on east

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.


East

Circular cross-section with Mo limiter


2007 east1

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.


Rf wall condition on east

EAST

RF wall condition on EAST

ASIPP


2007 east2

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.


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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


East

Optimization of gas pressure

EAST


East

Optimization of null field

EAST

Vloop < 3V, Bt = 2T for breakdown


East

Breakdown Vloop and dIp/dt ramp-up rate

3.5 V < Vloop < 6.5 V

0.1 MA < dIp/dt < 0.65 MA/s


East

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.


2007 east3

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.


East

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


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Ip, R, Z feedback control

EAST

Iso-flux control will be done


East

Plasma shaping during ramp-up

ASIPP

Ip ramp-up

PF7+9 and PF8+10 coils preset for different shaping rate control


East

Different shaping control test

ASIPP


Vertical instability control by ic coils

EAST

Vertical instability control by IC coils

ASIPP


East

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


East

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


2007 east4

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.


East

Divertor probes

EAST


East

内靶板


East

XUV

偏滤器位形,芯部XUV辐射减少

下偏滤器内靶板


East

4165#

CCD

Ha

XUV

限制器位形,XUV辐射增强


East

限制器位形,杂质辐射增强


2007 east5

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.


East

Operational region

EAST

ASIPP


East

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

ASIPP


East

High <neL> = 3×1019m-2, DN divertor

ASIPP


East

Long pulse divertor plasma

EAST

ASIPP


East

Long pulse (0.2MA/8.5s) 4611#

EAST

ASIPP


East

Ip = 0.5 MA divertor plasma

EAST

ASIPP


East

Ip = 0.5 MA divertor plasma (4582#)

EAST

ASIPP


Outline3

EAST

Outline

ASIPP

  • Introduction

  • EAST experimental setup

  • Experimental results

  • Next experimental plan

  • Summary


East experimental plan in 2008

EAST experimental Plan in 2008


Summary

EAST

Summary

ASIPP

  • (1) Divertor plasma has been achievedsuccessfully in 2007 on the EAST superconducting tokamak;

  • (2) The equilibrium reconstruction identified that: DN configuration with kappa=1.8 and delta=0.50; SN configuration with kappa=1.7 and delta=0.64, which almost cover all designed configurations;

  • (3) Plasma breakdown, current ramp-up, plasma shaping and control will be studied and optimized in detail; Iso-flux control technology will be used;

  • (4) Towards long-pulse high power plasmas, full graphite wall and PFC with high power heating (3.5MW LH+IC) and new diagnostics will be available in the 3rd experimental campaign.


Thanks

EAST

Thanks!

ASIPP


East

EAST

ASIPP

国家大科学工程装置EAST(英文全称:Experimental Advanced Superconducting Tokamak)是一个实验型的先进的全超导托卡马克装置,它的建设始于1998年。 EAST装置于2006年9月首次成功获得了高温等离子体放电,2007年1月又成功实现了双零和单零偏滤器位形的等离子体放电。在国际上,这是首次采用全超导的极向场线圈和全超导的纵场线圈技术,开展磁约束聚变等离子体物理研究。

EAST装置具有16个D型纵场超导线圈,它能产生并保持高达3.5特斯拉的稳态纵向磁场;EAST装置还具有14个极向场超导线圈,它能同时产生欧姆加热场、垂直场和偏滤器的成形场。它的成功研制和放电,是对下一代大型全超导的国际热核聚变实验堆(ITER)研究计划的一次巨大的激励和成功的鼓舞。


East

EAST

ASIPP

EAST装置的实验参数为:大半径是1.75米,小半径是0.4米,纵横比是4.25;首次实验运行的工作气体是氢气、纯欧姆加热、全金属材料的第一壁;最大等离子体电流达500千安培,最高线平均电子密度是每立方米4×1019个,中心电子温度约为800~1200电子伏特;纵向中心磁场为2特斯拉、边界安全因子为2~10;成功实现了偏滤器位形的等离子体放电、其拉长比为1.2~2。这些成果是由EAST物理实验团队经过8年艰苦奋斗获取的,本文全面综述了EAST物理实验的初步结果和下一步研究计划。


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