Some New Data From FRC Experiment on Relaxation For discussions at Hall-Dynamo and Related Physics meeting CMSO June 10-11, 2004 at PPPL Guo et al, PRL.

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Presentation transcript:

Some New Data From FRC Experiment on Relaxation For discussions at Hall-Dynamo and Related Physics meeting CMSO June 10-11, 2004 at PPPL Guo et al, PRL 92, (2004)

Outline Introduction –FRC –TCS experiment Experimental results –Flux conversion and magnetic helicity –Flow and kinetic helicity Summary

Field Reversed Configuration (FRC) Compact toroidal plasma with small toroidal field High-beta (~1), maximum beta confined by magnetic field Globally (and locally) unstable to MHD mode, but can be stabilized by physics beyond MHD (Hall, ion kinetic effect, etc.)

FRC Formed by Theta-Pinch Method Fast-pinch experiment using high-voltage and shock-heating: extremely violent process Can be formed and translated to another place Hoffman et al., U Washington

FRC Formation and Translation Plasma settles to a relatively stable state: relaxation?

Reduction of Toroidal Field Measured by internal probe array Initial toroidal field is reduced when relaxed

Flux Conversion and Magnetic Helicity Conservation?

Flow and Ion Kinetic Helicity Significant toroidal flow (>20% of V A ?)

Summary Tendency to settle at a relatively quite or relaxed state Flux conversion (toroidal to poloidal) while conserving magnetic helicity Significant flow exists with a finite kinetic helicity?