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Divertor/SOL contribution IEA/ITPA meeting Naka Nov. 23, 2003 Status and proposals of IEA-LT/ITPA collaboration Multi-machine Experiments Presented by.

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Presentation on theme: "Divertor/SOL contribution IEA/ITPA meeting Naka Nov. 23, 2003 Status and proposals of IEA-LT/ITPA collaboration Multi-machine Experiments Presented by."— Presentation transcript:

1 Divertor/SOL contribution IEA/ITPA meeting Naka Nov. 23, 2003 Status and proposals of IEA-LT/ITPA collaboration Multi-machine Experiments Presented by N. Asakura, ITPA SOL and Divertor physics topical group and Collaborators The Second IEA Large Tokamak Workshop, Naka, 23-24, Nov. 2003 Contents: Report on DSOL#1-6 and one new proposal

2 Divertor/SOL contribution IEA/ITPA meeting Naka Nov. 23, 2003 DSOL-1: Scaling of Type-1 ELM energy loss Goal: To better predict divertor and first-wall heat loads during ELMs Areas of concentration  ELM divertor heat pulse profile, deposition time and amount  Processes whereby core heat/particles are transferred to SOL  Characterization of radial transport of ELM energy Collaborators: A. Loarte, T. Leonard, N. Asakura, W. Suttrop, G. Counsell, A. Herrmann Results (2003)  JET/Fundamenski measurement of ELM radial velocity/energy falloff  ASDEX Upgrade measurement of far SOL ELM m/n number  JET - DIII-D dimensionless comparison (  * scaling)& AUG (in pedestal group) Plans (2004)  Continued measurement and analysis of radial ELM propagation (radial velocity and particle flux at the first wall/in SOL): MAST, AUG, DIII-D, JT-60U, JET  Joint. Exp. Plan: Toroidal and Poloidal distributions of heat flux(AUG:Feb. and MAST:June)  ELM heat and particle measurements may be available in joint experiment plans in pedestal group.

3 Divertor/SOL contribution IEA/ITPA meeting Naka Nov. 23, 2003 DSOL-2: Tritium codeposition Goal: To better predict the T inventory Areas of concentration  Understanding of local and global carbon transport  Understanding of chemical sputtering yield variation among experiments  Development and sharing of new diagnostics (e.g. quartz microbalance)  Effect of mixed materials on T inventory (e.g. W or Mo) Collaborators: V. Philipps, D. Whyte, G. Federici, P. Coad, P. Ghendrih, V. Rohde, B. Lipschultz, S. Higashijima Results (2003)  Achievement of global balances of material erosion and deposition (JET, AUG, TEXTOR)  Divertor geometry (strike point location) affects co-deposition (demonstration of QMB in JET) Plans (2004)  C-13 injection experiments to understand C migration (DIII-D, JET,JT-60U, TEXTOR), and also global transport (see DSOL-6)  Hydrocarbon injection to quantify chemical erosion data (JET, AUG, TEXTOR, JT-60U)

4 Divertor/SOL contribution IEA/ITPA meeting Naka Nov. 23, 2003 DSOL-3: Scaling of radial transport Goal: To better predict divertor & first-wall power/particle loadings Areas of concentration  Develop same measurements techniques for SOL profiles of n e, T e, S Ion  Collection of dimensionless similar and dissimilar discharges for analysis  Comparison of inner and outer SOL transport and turbulence Collaborators: B. Lipschultz, D. Whyte, G. Matthews, R. Pitts, G. Counsell, A. Kallenbach, T. Nakano, N.Asakura Results (2003)  Obtained dimensionless similar (to C-Mod, DIII-D) discharges on JET  Effective convective velocity v eff ~ a 0.25 Plans (2004)  Multi-machine modeling with fluid code under planning/negiciating (Ped. TG)  Expand database from L-mode to H-mode discharges on same tokamaks: Joint Exp. Plan expand database to AUG, NSTX, MAST H-modes.

5 Divertor/SOL contribution IEA/ITPA meeting Naka Nov. 23, 2003 DSOL-4: Disruptions and effect on materials choices Goals:  Better characterize divertor/first-wall heat loading  Understand if there are any size effects on the division of power loadings  Evaluate the performance of different materials for divertor/first-wall Areas of concentration  Comparison of heat deposition time and profile, radiation during thermal quench in multi-machines (over various disruptions: beta-limit, high-density, Locked-mode, etc.). Collaborators: D. Whyte, G. Matthews, R. Pitts, A. Mahdavi, A. Herrmann, R. Granetz, G.Counsell, V. Riccardo, K.H. Finken Results (2003)  Broad power deposition profile in the divertor in AUG and JET  Power fraction to divertor: different in JET rather than ASDEX-Upgrade/DIII-D  Analysis of the effect of disruption mitigation on wall materials Plans (2004)  Continued modelling of how the use of different gases affects the power deposition and thus melting  Disruption mitigation experiments on JET and C-Mod  Comparison of disruptions in ‘similar’ discharges on JET/AUG/DIII-D/MAST

6 Divertor/SOL contribution IEA/ITPA meeting Naka Nov. 23, 2003 DSOL-5: Role of Lyman absorption in the divertor Goals: Understand whether Lyman absorption is important to include in fluid models Areas of concentration  Develop EIRENE to handle radiation transport  Benchmark against C-Mod (opacity due to high density) and JET (opacity due to large size) Collaborators: D. Reiter, J. Terry, G. Matthews Results (2003)  Implemented pressure (Stark-) broadening  Tested against HID lamps - Stark effect small for ITER Plans (2004)  Implement isotope effects (line mixing) and and Zeeman splitting  Model radiation transfer in JET and C-Mod (existing data).

7 Divertor/SOL contribution IEA/ITPA meeting Naka Nov. 23, 2003 DSOL-6: Parallel transport in the SOL Goal: Capability to predict flow pattern in SOL Areas of concentration  SOL flows at a number of points (High-&Low-Field-sides, Top, Divertor): Determination of the flow pattern consistent with experiments and simulations?  Determination of influence of the SOL flow pattern on impurity transport  Experiments to determine influence of plasma rotation on parallel flows Collaborators: N. Asakura, G. Porter, K. Erents, B. LaBombard, J. Neuhauser Results (2003)  HFS SOL Mach flow meas. (C-Mod) - large flows to HFS divertor (also in JT-60U)  Doppler measurements (C-Mod, several locations) being compared to Mach probes  Puff & Pump affects the SOL flow and particle flux at HFS more than LFS (JT-60U) Plans (2004)  Continued Mach probe/Doppler comparisons (C-MOD)  Comparison with Experiments and Simulations with drifts, and Influence of the SOL flow (fast flow/ flow reversal) on the impurity transport/shielding is also determined (JT-60U, DIII-D, JET, C-MOD/ UEDGE-code).  C-13 injection of global impurity transport (DIII-D, JET, JT-60U, ASDEX-U)

8 Divertor/SOL contribution IEA/ITPA meeting Naka Nov. 23, 2003 New proposal - Multi-machine study on separatrix density and edge density profiles Goal: Proper prediction of the separatrix density and its gradient important for controlling particle exhaust and fueling in H-mode Areas of concentration  n e & T e measurements of the completer profile from pedestal to wall  n e /n sep and fraction of the pedestal inside separatrix Collaborators: A. Kallenbach, G. Porter, K. Erents, D. Mossessian, N. Asakura, G. Counsell Status (2003)  Data collected from AUG, C-Mod, DIII-D, JET, JT-60U and MAST  Scalings obtained (will be presented in 2004 PSI). Plans (2004)  Comparison of data with DIII-D neutral model of pedestal  Scalings of density gradients

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