90 likes | 299 Views
Macroscopic Liquid Metal Experiments at Illinois. David N. Ruzic Department of Nuclear, Plasma, and Radiological Engineering University of Illinois at Urbana Champaign. Tokamak First Wall : self propelled metal concept.
E N D
Macroscopic Liquid MetalExperiments at Illinois David N. Ruzic Department of Nuclear, Plasma, and Radiological Engineering University of Illinois at Urbana Champaign
Tokamak First Wall :self propelled metal concept externally supplied current may cause metal to flow up outboard wall
General Schematic of Experiment 14 Amp current
Hydrogen plasma discharge interaction with liquid gallium • A current through the liquid gallium metal was not shorted when a hydrogen plasma was present even with a large current flow though liquid metal.
J X B Force downward current lead Metal in gradient area rises But current density also increased ! Force
First Liquid Gallium Experiments • Metal in gradient area is not pushed down as hard as metal in stronger field. • Level rises about 3 mm. • Metal does not flow up the curved wall. • But current density increases near the wire so J goes up as B goes down.
Second Liquid Gallium Experiments • Replace wire current lead with a paddle shaped electrode to keep current density constant as gallium rises up the curved wall • Don’t make electrode out of aluminum! • Results showed a 2 mm displacement along curved surface at full field and 9 Amps