Study for advanc e d dive r tor magne tic c onfigur ation on E - PowerPoint PPT Presentation

1 st IAEA TM on Divertor Concepts ASIPP Study for advanc e d dive r tor magne tic c onfigur ation on E AST unde r ste ady- state c ondition . Che n 1 , ， B.J. Xia o 1,2 , J.G. L 1,2 , X.D. Zha ng 1 , Z.P. L uo 1 , Q.P.Yua n 1 , Y. Hua ng 1 , Y. Guo 1 , S.L i G. Ca la b rò 3 , R. Alb a ne se 2 , R. Amb ro sino 4 , F 3 , D. A. Humphre ys 5 , A.W. Hya tt 5 , E . Crisa nti . o le me n 6 , L . Ba rb a to 4 , G. De T 4 , E 1 , S. Ma stro ste fa no 4 , A. Piro nti 4 , V. K o mma si . Gio va nno zzi 4 , G. Ra mo g ida 4 , A.A. T uc c illo 3 , F . Villo ne 4 , B. Vio la 3 , R. Za g ó rski 7 , J.P. Pe ric o li Rido ldfini UO 1,2 , S.J. Du 1 , Q.Q. Yu 1 a nd E Qia n 1 , J. X. Zhe ng 1 , G.N. L AST te a m 1 Institute of Plasma Physics, Chinese Academy of Sciences, China 2 University of Science and Technology of China, China 3 ENEA, Unità Tecnica Fusione, Italy 4 CREATE, Università di Napoli Federico II, Italy 5 General Atomics, United States 6 Princeton Plasma Physics Laboratory, Princeton, NJ, United States 7 Institute of Plasma Physics and Laser Microfusion, Poland ASIPP/ EAST

OUT L INE  Motivation  E AST QSF mode ling and e xpe r ime nt  E AST F ishtail dive r tor c onc e pt  Summar y ASIPP/ EAST 2

OUT L INE  Motivation  E AST QSF mode ling and e xpe r ime nt  E AST F ishtail dive r tor c onc e pt  Summar y ASIPP/ EAST 3

Motivation: Powe r e xhaust c halle nge dive r tor ope r ation T he po we r tha t ha s to b e e xha uste d in-ve sse l fo r a fusio n re a c to r > 20% o f the fusio n po we r, he a t lo a d de po sit o ve r mm ra ng e ne a rb y the strike po int o n dive rto r ta rg e t. F or a c onve ntional dive r tor in r e ac tor  Pe a k he a t flux > 10 MW fo r no rma l o pe ra tio n  > 20 MW fo r E L My in sho rt pe rio d Options to r e duc e the dive r tor he at loads  T ile tilting  Hig h flux e xpa nsio n a t strike po ints  Strike po int swe e p, pe rturb e d fie ld b y RMPs, e tc .  SOL ra dia tio n, a nd dive rto r de ta c hme nt Magne tic s Solutions pr opose d to r e duc e the he at loads  T he Sno wfla ke Dive rto r [D.D. Ryuto v, 2007]  T he X-Dive rto r & Supe r-X Dive rto r [M. K o tsc he nre uthe r, 2004, P.M. Va la nju, 2009] ASIPP/ EAST 4

X-d (QSF ), Supe r X, or Snowflake (+,-) Sta nda rd Dive rto r X-dive rto r Supe r X-dive rto r • M. K o tsc he nre uthe r, I AE A F E C, (2004) • M. K o tsc he nre uthe r, POP 14, (2007) • P.M. Va la nju, POF 16, (2009) • D.D. Ryutov, POP 14, (2007) • D.D. Ryutov, POP 15, (2008) • D.D. Ryutov, Phys. Scr. 89, 88002 (2014) ASIPP/ EAST 5

OUT L INE  Motivation  E AST QSF e quilibr ium mode ling and simulation  E AST QSF e xpe r ime nt  Summar y ASIPP/ EAST 6

What c an E AST do for SF ? SF Dive r te d Configur ation E AST tokamak fe atur e s: De sign on E AST (Ip=250kA)  Supe r c onduc tive inte gr ate d PF c oils  Cur r e nt limit for e ve r y c oil: 14 kA  F ar distanc e be twe e n c oils and plasma amp  tur Highe r ns r e quir e me nt on c oils Solution? Quasi-Snowflake ASIPP/ EAST 7

E AST QSF E quilibr ium Mode ling A pure sno wfla ke ha s a sing le se c o nd o rde r null. Any de pa rture fro m the pe rfe c te d pure sno wfla ke c o nditio n, le a ds to the fo rma tio n o f two nulls. Onc e sa tisfy:   D = dista nc e b e twe e n two nulls 1 3 D  D expansion  a  a a = mino r ra dius ∆ = mid-plane SOL width T he Qua si-Sno wfla ke dive rto r (QSF ) c o nfig ura tio n is simila r to a pure sno wfla ke . QSF E q uilib rium pro po sa l fo r F AST & E AST rig io ne , 1 st I * D. F AE A DE MO Pro g ra m Wo rksho p 15-18 Oc t. 2012, UCL A L o s Ang e le s, CA. USA * G. Ca la b ro , 7 th I AE A T e c hniq ue Me e ting o n SSO, 14-17 Ma y 2013, Aix e n Pro ve nc e , F ra nc e * Y. Guo , 12 th Asia Pa c ific Physic s Co nfe re nc e , 14-19 July 2013, Ma kuha ri, Chib a , Ja pa n ASIPP/ EAST 8

Static e quilibr ia pr ove E AST availability for QSF Blac k: SN : Conne c tion L e ngth: L =95m & F lux E xpansion: f m =2.1 ASIPP/ EAST 9

1 st T ar ge t, RZIP c ontr olle d E AST QSF 1.6s 3.75s 1.6s 3.75s T ar ge t Plasma E quilibr ium limite d QSF limite d QSF LCFS of 1.6s & 3.75s 2 PF9 1.6s 3.75s PF7 PF11 1.5 PF5 1 PF13 PF3 IC1 0.5 PF1 Z [m] 0 PF2 -0.5 IC2 PF4 PF14 -1 PF6 -1.5 PF12 PF8 PF10 -2 0.5 1 1.5 2 2.5 3 R [m] ASIPP/ EAST 10

Shape Compar ison of E AST QSF and L SN 2 Main magne tic ge ome tr y for QSF and SN PF9 47038 48971 PF7 PF11 1.5 QSF SN PF5 48971@4.5s 47038@4.5s 1 PF13 0.389 0.260 Volume [m 3 ] SOL PF3 IC1 0.5 189.91 144.38 Conne c tion L e ngth [m] PF1 Z [m] 0 Magne tic flux PF2 8.22 2.01 e xpansion at oute r SP f m,out -0.5 IC2 PF4 Magne tic fie ld angle at 0.33 1.22 PF14 SP α out [de g] oute r -1 PF6 Magne tic flux D=79cm -1.5 4.71 2.34 e xpansion at inne r SP PF12 PF8 f m,in PF10 -2 Magne tic fie ld angle at 0.90 1.29 0.5 1 1.5 2 2.5 3 R [m] SP α in [de g] inne r Sc he ma tic 2D vie w o f E AST with SN # 47038 a t t=4.5s (b la c k so lid line ) a nd QSF (re d Pe ak he at flux so lid line ) a t t=4.5s pla sma b o unda rie s. 0.10 0.21 [MW/ m 2 ] ASIPP/ EAST 11

Signific ant pe ak flux r e duc tion by QSF Spa tio -te mpo ra l pro file s o f io n sa tura tio n c urre nt de nsity j SAT fo r SN (# 47038) a nd QSF disc ha rg e (# 48971). Onc e QSF c o nfig ura tio n b e c o me s sta b le , the pe a k T ime e vo lutio n o f ma in pla sma q ua ntitie s fo r o f j SA T is o b se rve d to dra stic a lly dro p SN (# 47038) a nd QSF disc ha rg e (# 48971) indic a ting a po ssib le he a t flux re duc tio n. ASIPP/ EAST 12

Pe ak he at r e duc tion by mode ling and e xpe r ime nt obse r vation 0.35 #48971@4.5s 0.30 SN 0.25 QSF MW/m 2 0.20 SNexp QSFexp 0.15 0.10 0.05 0.00 ‐ 0.1 ‐ 0.05 0 0.05 0.1 0.15 0.2 0.25 Distance along target [m] ‐ 0.05 I nfra re d c a me ra me a sure d (SNe xp & QSF e xp)a nd simula te d po we r de nsity (SN & QSF ) a t the lo we r o ute r ta rg e t. 13 ASIPP/ EAST

E AST QSF by ISOF L UX shape fe e dbac k c ontr ol 55993@2.8s 2 PF9 PF7 PF11 1.5 PF5 1 PF13 PF3 IC1 0.5 PF1 Z [m] 0 PF2 -0.5 PF4 IC2 PF14 -1 PF6 -1.5 PF12 PF8 ISOLSN RZIP PF10 -2  Before 2.7s, using RZIP control 0.5 1 1.5 2 2.5 3 R [m]  2.7s~2.8s transition from RZIP to ISOFLUX 200ms oscillation  feed forward current on coils based on previous QSF discharge indicates there will be  target Equilibrium at2.7s from previous QSF reconstruction good QSF by ISOFLUX control ASIPP/ EAST 14

E AST QSF by ISOF L UX shape fe e dbac k c ontr ol 56429 56431 56495 300 IP [kA] 200 100 2 1 2 3 4 5 6 7 1.9 R [m] 1.8 0.4 1.7 1 2 3 4 5 6 7 0.2 Z [m] 0 -0.2 10 1 2 3 4 5 6 7 5 IC [kA] 0 -5 1 2 3 4 5 6 7 Time [s] ASIPP/ EAST 15

19 s E AST QSF assiste d by L HW, Vloop~0 To optimize the LHW coupling: • Gap and shape • Gas puff on the antenna • 0.2-2.7s, RZIP + feed forward PF current to reach QSF shape • After 2.7s, using ISO-SN+PEFIT, longest shot 56603 ASIPP/ EAST 16

EAST 17 HW) + 3.8 (NBI) MW : Ip 250kA, P~ 1.7(L QSF ASIPP/ AST H mode E

Signific ant pe ak he at load r e duc tion in H-mode LSN 57237: LHW (0.9 MW + 1.0 MW) + NBI (2.0 MW + 1.8 MW) QSF 57239: LHW (0.9 MW + 0.8 MW ) + NBI (2.0 MW + 1.8 MW) LSN QSF EAST Shot:57239 EAST Shot:57237 60 6 Peak q t MWm -2 Peak q t MWm -2 40 4 20 2 1 0 0 2 P LHCD (MW) P LHCD (MW) 1 0.5 0 0 -0.5 4 -1 4 P NBI (MW) P NBI (MW) 2 2 0 0 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 Time(s) Time(s) ASIPP/ EAST 18

Initial MIMO control of QSF shape Shot: 56901 • Contr ol var iable s: Ip (A) F luxe s, B p at X n e (10e19/m 3 ) Z (m) R (m) I c (A) Time (s) 19 ASIPP/ EAST

OUT L INE  Motivation  E AST QSF mode ling and e xpe r ime nt  E AST F ishtailing dive r tor c onc e pt X.D. Zhang, J.P . Qian, J.X. Zhen, G.-N. Luo S.J. Du, B.J. Xiao, Q. Yu* * Max-Planck IPP in Garching ASIPP/ EAST 20

F ishtailing dive r tor : AC c oils ne ar tar ge t Idea: strike point sweeping in a time scale shorter than the thermal transient X-point to avoid the overheating of the target strike points reciprocating  A coil runs ~ ± 5kA AC current motion like moves the strike point by +- 5 cm, AC coil AC coil fishtail swing thus spreads the heat load in time averaged way and reduces Magnetic scanning divertor the peak target temperature. Heat flux spreading and decrease the temperature of divertor Divertor configuration like fishtail 21 ASIPP/ EAST 21

Fishtail divertor: AC in coil near the target • 5 kA c an move str ike point by +- 5 c m (Ip~ 500 kA) Significant change of the strike point, less influence to X points , shape and core plasma 22 ASIPP/ EAST