Experimental studies of ITER demonstration discharges
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1 IT/2-2 Experimental studies of ITER demonstration discharges George Sips MPI für Plasmaphysik, EURATOM-Association, Garching, Germany T.A. Casper 2, E.J. Doyle 3, G. Giruzzi 4, Y. Gribov 5, J. Hobirk 1, G.M.D. Hogeweij 6, L. Horton 1, A. Hubbard 7, I. Hutchinson 7, S. Ide 8, A. Isayama 8, F. Imbeaux 4, G.L. Jackson 9, Y. Kamada 8, C. Kessel 10, F. Kochl 11, P. Lomas 12, X. Litaudon 4, T.C. Luce 9, E. Marmar 7, M. Mattei 13, I. Nunes 14, N. Oyama 8, V. Parail 12, A. Portone 15, G. Saibene 15, R. Sartori 15, T. Suzuki 8, G. Tardini 1, S. Wolfe 7. The C-Mod team 7, the AUG team 1, the DIII-D team 9 and JET EFDA contributors MPI für Plasmaphysik, EURATOM-Association, Garching, Germany. 2 LLNL, PO Box 808, Livermore, CA 94550, USA. 3 Physics Dept. and PSTI, Univ. of California, Los Angeles, CA, USA. 4 Ass. Euratom-CEA, Cadarache Saint Paul Lez Durance, France. 5 ITER-IO, Cadarache Saint Paul Lez Durance, France. 6 FOM Rijnhuizen, Ass. EURATOM-FOM,, The Netherlands. 7 MIT, Plasma Science and Fusion Center, Cambridge, USA. 8 JAEA, Muko-yama, Naka, Ibaraki , Japan. 9 General Atomics, San Diego, USA 10 Plasma Physics Laboratory, Princeton University, Princeton, USA. 11 Association EURATOM-ÖAW/ATI, Vienna, Austria. 12 EURATOM/UKAEA Fusion Ass., Culham Science Centre, OX14 3DB, UK. 13 Ass. Euratom-ENEA-CREATE, Univ. degli Studi di Reggio Calabria, Italy. 14 Euratom/IST Fusion Ass., Centro de Fusao Nuclear, Lisboa, Portugal. 15 FUSION FOR ENERGY, Joint Undertaking, Barcelona, Spain. 16 JET-EFDA, Culham Science Centre, Abingdon OX14 3DB, UK. 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 1
2 Motivation ITER: Unique combination of size, high power, long pulse,. stringent demands on the superconducting poloidal field system ( flux l i (3)= at 15MA (..OH Holtkamp, OV/2-1 Hawryluk, IT/1-2 Kessel, IT/2-3 ( 2008 ) Mattei Until recently ( IAEA FEC, 2006 ): NO detailed experimental data on the time evolution of ITER like plasma discharges. Dedicated experiments at C-Mod, AUG, DIII-D and JET on all aspects of the ITER discharge scenario. (in part coordinated by the SSO-TG of the ITPA) Romanelli, OV/1-2 Strait, OV/1-4 Zohm, OV/2-3 Marmar, OV/ nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 2
3 ITER discharge scenario I p ( 400s ) Flat top 15MA, Std H-mode at q 95 =3 ( 400s ) Flat top I p rise (70s- 100s) I p ramp down ( s ) Breakdown Experimental verification of discharge evolution, l i (3) Joint,experiments consistent results? s 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 3
4 Outline Plasma breakdown phase at low voltage. Current rise phase. Flat top phase at q 95 =3 (Q=10 reference scenario). (Poster: q 95 =4-4.5 for the hybrid scenario). Current ramp-down phase. Conclusions & Implications for ITER. 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 4
5 Breakdown phase R 0 [m] B T [T] ECRH Power (type) E (V/m) Ohmic E (V/m) assisted C-Mod AUG GHz MW (X2,O1) EAST (LHCD) 0.3 MW (LH) DIII-D GHz MW (X2) KSTAR GHz 0.35 MW (X2) TS GHz MW (O1) JET (LHCD) MW (LH) JT-60U GHz MW (O1) (0.43) 0.26 ITER (170) GHz 3 (20) MW (O1) Un-assisted (ohmic) breakdown: E with machine size (JET~0.23V/m). Reliable breakdown ~0.2V/m with ECRH assist for all devices (EAST, JET use LHCD). Or V/m for a de-conditioned machine. 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 5
6 Breakdown phase (example) AUG Zohm, OV/ E axis [V/m] 0.33V/m AUG: Resistor-less operation: NEW for AUG: E=V/m 0.25V/m P ECRH [MW] D α [a.u] ( HFS ) Resonance: r/a=0.2, high field side ECRH pre-ionisation and assist: ( 2.3T ) X2: 105 GHz (1.7T), 140 GHz O1: 105 GHz (3.2T), HFS (R ec =1.45m). ITER using 170 GHz (O1) at full field (5.3T) or X2 at half field. 0.4 Ip 0.2 [MA] Breakdown at low loop voltage: Successful, reproducible, reliable. Slow, controlled, rise of I p. No MHD reconnection low l i. 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 6
7 Current rise phase Study several aspects of the current rise phase: The optimum plasma shape evolution, ohmic discharges, use of additional heating, I p tools available for l i control. used here l i =l i (3) =2 B p2 dv/((µ 0 I p ) 2 R) Heating? time 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 7
8 Current rise phase (plasma shape) 3 2 JET, Ohmic I p [MA] DIII-D, Ohmic I p [MA] Jackson, IT/P7-6 small bore full bore Small bore: l i ~ small bore large bore full bore 1.5 li X pt forms X pt forms Full bore l i = l i X pt forms X pt forms X pt forms T e [kev] Sawteeth begin q control j-profile at start of the flat top ALL experiments show advantage of using full bore limiter + early divert: Large plasma size, Z eff control, density control, allow early heating.. 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 8
9 Current rise phase (ohmic) l i ohmic 15MA OH flux limit - Full bore rise, ohmic q 95 =3 - <n e >/n GW = Low voltage breakdown 0.9 l i =-5 (stable) using fastest currents ramp rates. 0.7 Scaling ~ a 2, T e 3/2, Z eff ITER: ( 60s ~ Fast ramp: ~70s (limit Slow ramp: ~100s MHD unstable C-Mod AUG DIII-D JET ITER 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 9
10 Current rise phase (example) l i JET, di p /dt=0.28ma/s H-mode: 5MW ICRH H-mode: 6MW NBI H-mode: 10MW NBI Ohmic Flat top JET: Heating allows large variation of l i, independent of heating method. divert L-mode L H H-mode: Low l i =0.63- (broad T e (r), edge pedestal). 0.7 L H Start NBI ITB L H 0.6 Heating phase JET and DIII-D: Active control of l i during current ramp phase to q 95 ~3 I p /dt, Heating power (~ 50% extra..) 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 10
11 Current rise phase (heating) l i ohmic L-mode H-mode C-Mod: ICRH AUG: NBI, ECRH DIII-D: NBI JET: ICRH, LHCD, NBI 0.9 Heating during limiter phase the Z eff 2-4, so l i ~0.9-1 For Z eff ~1.6-2 low l i, Heating dominates over current drive effects. 0.7 C-Mod AUG DIII-D JET ITER ITER: Modest ramp rate, with 5-10MW heating in L-mode (50% extra for control) 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 11
12 Flat top, at q 95 =3 The experiments aimed at obtaining H 98 ~1 and β N ~1.8 as required for ITER to achieve Q~10 at 15MA: Evolution during the flat top phase T i (0)~T e (0) in most discharges. Typically P rad is between of P tot No active ELM mitigation or radiation seeding was used. β rises within 2τ E, density rises within 4-6τ E I p [MA] /B T [T] P tot [MW] <n e > [10 19 m -3 ] β p / β N H 98 f GW P tot /P LH ( 1 ) l i (end ( FT of AUG 1.0 / / DIII-D 1.5 / / JET 2.5 / / ! 0 ITER 15 / / ? (1) P L-H [MW] =2.15*n e *B T *a R 1.0 ( 2008 ) Martin 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 12
13 Flat top, at q 95 =3 (l i evolution) H-mode starts at beginning of flat top, current rise controlled l i = AUG Doyle, EX/1-3 ITER shape, low f ELM DIII-D JET rise FT rise rise FT 0.6 FT DIII-D, infrequent ELMs significant edge pedestal contribution! Consistent equilibrium calculations for the different devices? 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 13
14 Flat top, at q 95 =3 (l i evolution) ( tot H-L mode back-transition, in DIII-D and JET (stepping down P AUG Doyle, EX/1-3 DIII-D 1.2 JET 1 1 FT 1 FT H-mode H L 0.6 H L DIII-D: rise of l i then disrupts, JET: rise of l i to 1 within 3s ITER needs strategy for coping with H L transition at 15MA. New data useful for control simulations in ITER (seen IT-2-3) nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 14
15 k Current ramp down C-Mod k κ 1.5 κ 1.5 I p [MA] I OH [ka] 10% κ~ l i C-Mod: 1MA/s ramp down keeps l i < 1.2 However, this ramp down requires ~10% increase in central OH current. Similar results for AUG, DIII-D, JET: Vertically stable and low l i in ramp down: Elongation reduced from 1.85 to 1.5. For ohmic or L-mode, slow decay (I p /dt) (ITER: ~ 300s, OH flux consumption?) Or use H-mode for significant part of ramp down phase (preliminary). ITER ramp down phase is important! experiments and modelling required. 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 15
16 Conclusions Breakdown at ~0.3V/m: E=0.33V/m in ITER is sufficient for ohmic & using 170GHz system in ITER to provide assist. I p rise phase (test 15MA scenario): Variation of l i = Full bore, early X-point in ITER! Heating is essential to prepare burn phase. Flat top at q 95 =3: PF coils system should cope with l i = in H- mode, and cope with loss of H-mode during flat top. I p ramp down: Deserves more attention. Slow ramp down for ohmic or L-mode or use H-mode. Need viable ITER scenario + simulations. More remains to be done: Advanced scenarios, RF dominated plasma, simulation of burn control. 22 nd IAEA Fusion Energy Conference, Geneva, October 2008
17 Extra slides (for Poster) 22 nd IAEA Fusion Energy Conference, Geneva, October 2008
18 Hybrid scenario (q 95 ~4-4.5) ALL, including C-Mod (using LHCD, WILSON, EX/P6-21), produce target q(r) with q(0) 1 using ITER relevant current rise phase. JT-60U: Long pulse capability: β N >2.3 and H 98 ~1 for 23.1 s Low ρ*: New JET results with H 98 = DIII-D: ITER Demo Oyama, OV/1-3 Joffrin, EX/1-4Ra Doyle, EX/ nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 18
19 Conclusions (I) Verification of ITER scenarios by C-Mod, AUG, DIII-D, JET and JT-60U: Breakdown at ~0.3V/m: Ohmic breakdown reliable for larges devices. Robust with ECRH assist for all devices. E=0.33V/m in ITER is sufficient & 170GHz system in ITER would be suitable to provide assist. I p rise phase (mainly at q 95 ~3, to test 15MA scenario): Best results using full bore, early divert plasma shape evolution. Ohmic: l i = Heated: l i = Lowest values for H-mode. Control and advanced scenarios are feasible Allow full bore, early X-point in ITER. Heating is very desirable. 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 19
20 Conclusions (II) Flat top at q 95 =3: Q=10 conditions documented. PF coils system should cope with l i = in H-mode, And cope with loss of H-mode during flat top. PF coil operational range in ITER should cover l i = at 15MA. I p ramp down: Deserves more attention (many aspects to safe ramp down phase). If l i <1.6 during first half of ramp down slow decay (300s!) for ohmic or L-mode ramp down (OH flux consumption) or use H-mode. Need viable ITER scenario, backed-up by simulations. More remains to be done: Advanced scenarios, RF dominated plasmas and simulation of burn control. 22 nd IAEA Fusion Energy Conference, Geneva, October 2008 Page 20
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