Possible Liquid Walls Experiments in Levitated Dipole Experiment

Leslie Bromberg MIT Plasma Science and Fusion Center

in Collaboration with

J. Kesner, MIT M. Mauel, D. Garnier, Columbia University LDX Columbia University LDX vacuum chamber

installed in Tara cell Columbia University

• LDX 5 m (diameter) vacuum chamber has been installed and pumped down. Two views of LDX vacuum chamber Columbia University

• LDX (5 m diameter) vacuum vessel will house floating superconducting ring.

• Floating ring utilizes advanced Nb3Sn superconductor & carries 1.5 MA. LDX Columbia University Flux surfaces and field magnitude of C-Coil Columbia University

0.2 T 0.1 T

0.5 T

1 T

2 T

5 T Flux field lines and magnetic field for L and F coils Columbia University Columbia University

Why is Dipole Confinement Interesting?

The Io plasma torus around Jupiter

J. Spenser

• High-β confinement occurs • Published articles describe naturally in magnetospheres dipole fusion power sources, • β ~ 2 in Jupiter plasma-ring interactions, MHD • Simplest confinement field and drift-wave stability • Proposed by A. Hasegawa • Key physics identified in space (1988) from space observations and in theory Liquid wall experiments in LDX Columbia University

• Three classes of experiments are possible in LDX:

• Experiments using static fields • Large volumes, high fields, flexible geometry, steady state

• Liquid wall experiments external to the plasma • Large areas possible, relatively large heat flux, steady state, high field

• Stagnant Li experiments with ring coverage • Programmatic interest, with Li in porous matrix Experiments with External Liquid Walls Columbia University

LM No zzle Pla sm a e d g e LM metal Plasma edge

HoHot t Pla Plasma s m a

LLevitatedevitated ring ring

BackBa c kp laplate t e Liquidl wall Liq u id wa l