TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, 16 - 21 October.

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TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Influence of the Dynamic Ergodic Divertor on TEXTOR Discharges K.H. Finken, Y. Xu, S.S. Abdullaev, M. Jakubowski, M. Lehnen, M. F. M. de Bock, S. Bozhenkov, S. Brezinsek, C. Busch, I.G.J. Classen, J.W. Coenen, D. Harting, M. von Hellermann, S. Jachmich, R.J.E. Jaspers, Y. Kikuchi, A. Krämer-Flecken, M. Mitri, P. Peleman, Pospieszczyk, D. Reiser, D. Reiter, U. Samm, D. Schega, A.O. Schmitz, S. Soldatov, B. Unterberg, M. Van Schoor, M. Vergote, R.R. Weynants, R. Wolf, O.Zimmermann, and the TEXTOR Team

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China DED topics: Helical divertor Field line and plasma topology Impurity shielding Field line penetration Interaction with MHD

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Outline: Introduction to DED Effect of the perturbation field on ELMs Improved confinement by DED Turbulence reduction by DED Summary

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China 16 DED coils Max. current per coil:15 kA DC and AC up to:10 kHz

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China m = 6, n = 2 m = 12, n = 4 m = 3, n = 1 Base modes for DED operation

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China H-mode characterization and ELM suppression by DED-field

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Characterization of H-mode Basic scenario: I p = 240 kA/ B t = 1.2 T-1.4 T, plasma shifted to HFS (R=1.68m / a=0.4m)

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Power threshold about twice the L-H threshold in divertor tokamaks – “typical” for limiter H-modes x P sep / W x 10 6 P L-H thresh, IAEA96 / W o no DED + with DED # 97300/1, 97312/14/15, # 98296, 98491, with ELM signature w./o. ELM signature "dithering" continued ELM - signature over 1s # # (L-H transition) Predictive RITM code calculations for 1.3 MW heating power and H/ (H+D) = 40% and TEXTOR data D. Kalupin, M. Tokar

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China ELM frequencies TEXTOR limiter H-mode

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Evolution of edge pressure HFS TEXTOR # (thermal He beam) R= 1.3 m L-H – transition H- L – transition with DED

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China ELM mitigation in 12/4 base mode ELM suppression starts at 3 kA

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China ELM mitigation in 12/4 base mode DED threshold: 3 kA

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China ELM mitigation in AC 3/1 base mode

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Improvement of energy confinement during H-mode modest some reduction of energy confinement with DED

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Confinement change with DED in m/n = 6/2 base mode

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Best conditions have been observed for strongly inward shifted plasmas low density plasmas, low collisionality Co-NBI heating I p = 310 kA; B t = 1.9 T I DED = 7.5 kA

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Stepwise density increase during DED-ramps

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Density profileDensity time trace

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China pressure time trace

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Comparison of pressure profiles for discharges with and without DED (from Thomson scattering) NeNe N e *T e

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Plasma rotation Poloidal rotation CIII Heat pattern and electric potential Related effects

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Field line structure at density step q=2.0 island Poincaré plotLaminar plot Starting ergodization of q=2 surface

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Effect of the DED on turbulence

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Turbulence-probe 3 strokes during one discharge Effect of the DED on turbulence

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Turbulence-probe head (RS-probe)  “Reynolds stress probe”: o measures: floating and plasma potential electron temperature electron density and particle flux o main feature: small pins dedicated to measure fluctuations of poloidal and radial velocity => Reynolds stress Zonal flows o min radius: 42 cm (217 cm) Boron-nitride body (isolator) Tungsten pins (d = 1-2 mm)

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Ergodic zone a =45.7cm Equilibrium profiles (6/2 DED) VfVf TeTe Before DED  DED ramp  DED plateau  nene r (cm) a =45.7cm ErEr

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Turbulence with / without DED  in 3/1 DED ~  in 6/2 DED ~ Before DED  DED ramp  DED plateau  S(f) a r (cm) l c  (cm) l c r (cm) Ergodic zone Coherent modes reduced Size of turbulent cells reduced Inward flux with DED

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Summary Confinement improvements have been observed for some plasma / DED conditions. Best conditions were found for strongly heated low density plasmas shifted strongly towards the HFS (DED). Improvement has a resonance character with respect to q(a) and the DED-current. On TEXTOR, a limiter H-mode has been obtained. The ELMs were reduced at moderate ergodization levels. 12/4 and AC 3/1 base modes have been applied successfully. The energy confinement is slightly reduced by DED.

TEC Trilateral Euregio Cluster Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich 21st IAEA Fusion Energy Conference, October 2006, Chengdu, China Summary continued Probe measurements: Strong effect of DED on equilibrium values of  (r) and E r. Turbulent flux reverses sign. Size of large turbulent structures reduced. Coherent modes strongly reduced.