1、1EAST全全超导超导托卡马克托卡马克准稳态准稳态无无ELM运行运行模式模式实验实验探索探索2Transient heat flux induced by large ELMs is a great challenge for magnetic fusion!ZhitlukhinZhitlukhin JNM 2007 JNM 2007ELM：An electromagnetic disturbance induced by MHD instability,locates in pedestal region and cause the pedestal collapsing in a hund
2、reds microseconds;Advantages：Exhaust impurities and fuel ions maintain stationary H-mode;Weakness：Erosion of wall materials shorten material lifetime.PedestalheightSmall/no ELM regime with good confinement is desired!3Outline41.1:15s long pulse nearly fully non-inductive stationary no-ELM H mode wit
3、h 4.6GHz LHCDnel 2.5 1019m 3 40%nGWPLHCD(4.6GHz)2MW(1.4MW absorption)n 1.1D XUV radiationLoop voltage 0Wdia 120kJH98 1.2 low 0.56,1.6,q95 6.3 li 1.1 Peaking current profileMeasured by edge Helium BESIp=0.38 kA,Bt=2.3T,R0=1.9m,a=0.44m#49816ECM51.2:Stationary no-ELM H-mode regime obtained with 4.6GHz
4、LHCD or Ctr-NBI+ECRHUp to now,stationary no-ELM H-mode plasmas have been obtained mostly with 4.6GHz LHCD heating.Configuration gapout：3.5-5.5cm&elongation：1.55-1.65;LSN or USN.ECMELMs come back when ECM is suppressed by 2.45GHz_LHCD;Y.Ye,G.S.Xu*NF 57(2017)08604161.3:ECM featuresECM:f=15-90 kHz,elec
5、tron dia-direction,n 19,m 60Locates in the steep-gradient pedestal region,with high collisionalityH.Q.Wang,G.S.Xu et al.,PRL 185004(2014)GYRO simulations show the nature of dissipative trapped electron mode(DTEM)LP measurements directly show the ECM-driven radial particle and heat transport.7MCMECMN
6、o-ELM H-mode(a)(b)(c)(d)Extensive Lithium wall coating(30g evaporation)D baseline decreases to a certain level no-ELMExtensive Lithium wall coating broadband ECM&MCM co-existLithium-aerosol-injection ECM disappears&MCM stronger or more coherentECMECMMCMMCM(a)(b)(c)(d)Lithium aerosol injectionG.S.Xu
7、26th IAEA Conference,2016 EX/10-2ECM:high n electrostatic coherent mode MCM:low n magnetic coherent mode82.2:Low recycling no-ELM H-mode regime reveals an obvious density thresholdCentral-line-averaged density(a)(b)(c)(d)No-ELM H-modeCentral-line-averaged densityNo-ELM H-mode e92.3：EAST obtains puls
8、e length 100s stationary H-mode New World Record！EASTEAST在以在以低动量注入纯射频波加热低动量注入纯射频波加热、钨偏滤器钨偏滤器等类似等类似ITERITER未来运行条件下，未来运行条件下，成功实现了全程小成功实现了全程小ELMsELMs的高约束的高约束H H模，有效模，有效控制了偏滤器靶板热负荷和钨杂质控制了偏滤器靶板热负荷和钨杂质返流，获得了约束改善因子返流，获得了约束改善因子H H98y298y2大于大于1.11.1的的完全非感应稳态完全非感应稳态高性能等离子体，高性能等离子体，并通过并通过先进磁位形先进磁位形的精确控制实现了等离子体
9、运行的的精确控制实现了等离子体运行的软着陆。软着陆。G.S.Xu 2017 EPS invited talk I1.10410ELM-freeELM-free MCM appearance is independent of:Heating schemes(NBI alone,LHCD alone or with additional heating power from ICRF,ECRH);Wall coating(lithium,silicon);Wall materials(full C 2010,C divertor+Mo first wall 2012,C lower divert
10、or+W upper divertor+Mo first wall since 2014).DBS diagnostic11Located at the lower frequency Located at the lower frequency boundary of the TAE gapboundary of the TAE gap0950002122iizATAEBqRmnk vfMCMGTAWGTAWG.S.Xu et al.,11th Westlake Conference,2017 HangZhou,CN 12SeparatrixConfinementConfinementimprovementimprovement000012121iziAABqqRk vmn00000121AziiiABqRnmknvSMBI-induced edge confinement improvementFrequency correlated with pedestal foot density,not pedestal top density.
