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Dusty plasmas with magnetized dust

Auburn University  October 19, 2009. Dusty plasmas with magnetized dust. Bob Merlino University of Iowa. Full text available at: http://www.physics.uiowa.edu/~rmerlino/Dusty%20Plasmas.htm. Why?. New dusty plasma physics to study

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Dusty plasmas with magnetized dust

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  1. Auburn University  October 19, 2009 Dusty plasmas with magnetized dust Bob Merlino University of Iowa Full text available at: http://www.physics.uiowa.edu/~rmerlino/Dusty%20Plasmas.htm

  2. Why? • New dusty plasma physics to study • Astrophysical and planetary dusty plasmas have magnetized dust • Much theoretical work on waves in magnetized dusty plasmas has been done

  3. Criteria for magnetized dust 1. dust gyroradius << transverse plasma dimension 2. dust gyrofrequency >> dust-neutral collision frequency

  4. Magnetic field strengthvs. device size • Criteria can be satisfied with high B and moderate size device, or • Moderate B and very large device • Cost trade-off ??

  5. Dust size consideration • Both criteria are satisfied more easily with small dust grains • But, grains that are too small are not easily imaged • Another issue  diagnostics ??

  6. Plasma source considerations • Not easy to make uniform and stable plasmas in high B fields • Discharge sources require neutral gas, and the dust-neutral collision frequency ~ pressure • Probably need plasma source that operates at pressures below 10-5 torr

  7. Parameter scalings (a = dust radius)

  8. Dust gyroradius vs. B

  9. questions • Should the particles be large enough to be imaged? • How will we diagnose this dusty plasma? • What type of plasma source should be used? • What dusty plasma physics should be studied

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