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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 on theme: "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."— Presentation transcript:

1 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)

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

3 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.)

4 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

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

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

7 Flux Conversion and Magnetic Helicity Conservation?

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

9 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?


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