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Dusty plasmas with magnetized dust

Discover the intriguing world of magnetized dusty plasmas, crucial in astrophysics and planetary studies. Learn about dust gyrofrequency, magnetic field strength, diagnostic challenges, and plasma source considerations.

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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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