Physics Aspects of the Dynamic Ergodic Divertor (DED) · The DED-coils are continuous helical...

Trilateral Euregio Cluster

Institut für PlasmaphysikAssoziation EURATOM-Forschungszentrum Jülich

Physics Aspects of the Dynamic Ergodic Divertor(DED)

FINKEN K. Heinz1, KOBAYASHI Masahiro1,2, ABDULLAEV S. Sadrilla1, JAKUBOWSKI Marcin1,3

1Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM Association,D-52425 Jülich, Germany, Partner in the Trilateral Euregio Cluster2Department of Energy Engineering and Science, Nagoya University, Nagoya, Japan3University of Opole, Institute of Physics, Opole, Poland

Outline

Motivation, aims

Experimental set-up

Ergodic zone

Laminar zone

Dynamic Aspect

Motivation:

• The next fusion device (ITER) will have a fusionpower of about 1.5 GW

• ===> 300 MW α-particle heating

• This power goes to divertor plates, if plasma edge is not radiatively cooled

• Assuming a divertor length of 30 m and a strikepoint width of 2 x 4 cm ==> power density of 12.5 kW/cm2

• For these power fluxes, no technical solutions are known

Heat Flux

Hot Plasma Core

Scrape-off LayerPump Limiter

Peak Load

Plasma Edge Radiation: too lowLimiter Heat Load: excessive

Plasma Edge Radiation:dominating

Limiter Heat Load: tolerable

Heat Flux

Hot Plasma Core

Scrape-off LayerPump Limiter

Peak Load

Radiating Belt(Seeded

Impurities)

Set-up

• 4 quartets of perturbation coils plus two compensation coils

• 4 Phases ===> Rotation of perturbation field

• f: DC, 50 Hz, band 1 kHz - 10 kHz

• Arrangement at HFS with continuous winding in vessel

• Maximum perturbation current: 15 kA

• Resonance: q(rres) = 3; rres = 0.43 ... 0.46 m (a=0.46 m)

• Base modes: m/n = 12/4; 6/2; 3/1 and mixture of 12/4 + 6/2

Set-up

Final coil design

Wide angle view in TEXTOR

DED - Spulenkühlung

Wasserkühlung

Heliumgas

isolierteKupferleiter

Konditionierungbei 250 °CHe auspumpen

Temperaturhub: 110 °C → 250 °C

Scientific aims for DED program

DC-operation

• Comparison to other ergodization experiments

• Optimisation of the radiation belt

• Optimisation of particle exhaust

• Investigation of a helical divertor

Low frequency operation:

• Smearing out of local peaks of heat flux

1 kHz - 10 kHz operation

• Smearing out of local heat fluxes

• Generation of temporal ergodization

• Generation of a differential plasma rotation

• Improvement of plasma confinement

• Delay of disruption limit

• Plasma compression in front of pump limiter

30 % perturbation current

r=0.5 m

r=0.4 mΘ = 360° Θ = 0°

ALT-II

100 % perturbation current

ALT-II

r=0.5 m

r=0.4 mΘ = 360° Θ = 0°

0.43 0.44 0.45 0.46 r [m]

rres rcoilrres + ε r

0.38 0.42 0.46 0.5 0.54 0.58

radius (m)

resistive width: 2.5 cm; m=20

1 kHz2 kHz5 kHz

10 kHz

0 . 0 1 0 . 1 1 1 0 1 0 0

F r e q u e n c y ( k H z )

Summary

The DED-coils are continuous helical windings located at the HFS inside the vessel.

The Dynamic ergodic divertor will most likely provide a sufficient ergodization level at the plasma edge.

A laminar zone will form the main contact region with the wall; a 2D and 3D modeling was successful.

The field rotation imposes a torque at the plasma edge which is probably sufficient for generating a differential plasma rotation.

The differential rotation may lead to a suppression of turbulence and an improvement of the confinement; locked modes should beacceterated again.

Physics Aspects of the Dynamic Ergodic Divertor (DED) · The DED-coils are continuous helical...

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