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APS_sample - A proposed Magnetized Dusty Plasma User...

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A proposed Magnetized Dusty Plasma User Facility E. Thomas, Jr. (Auburn Univ.), R. L. Merlino (Univ. Iowa), M. Rosenberg (UCSD) ABSTRACT: As the experimental study of dusty (complex) plasmas has advanced over the last two decades, a great deal of new insight has been gained on the complex interaction between the background plasma and charged microparticles. Even through the charged dust grains in a typical experiment can acquire several thousand elementary charges, the large mass of the grains ensures that the charge-to-mass ratio is quite low. As a result, it has been considered experimentally challenging to design an experiment that can achieve full magnetization of ions, electrons, and the charged dust grains. However, with continuing improvements in magnet design and sub-micron particle imaging technologies, it is now possible to contemplate the development of a Magnetized Dusty Plasma Facility. This presentation discusses the design, experimental parameters, and scientific motivation for a flexible, superconducting, 4 Tesla magnetic field user facility for the study of magnetized dusty plasmas. This work is supported by NSF grant number PHY-0936470 (AU), DOE Grant No. DE- FG01-04ER54795 (UI) and DOE Grant No. DE-FG02-04ER54804 (UCSD) Feasibility of a magnetized dusty plasma facility Motivation: Why a magnetized dusty plasma? Previous experiments on magnetized dusty plasmas Magnetized Dusty Plasma Experiment Current Status • Preliminary calculations suggest that the development and operation of a US magnetized dusty plasma user facility can be successful. • Preliminary magnet designs show that the operating conditions needed for performing experiments are reasonable and achievable. • Partner Institutions: Auburn, Baylor, Colorado, Iowa, LANL, MIT, MPE, NRL, PPPL, Wittenberg • Naturally occurring plasmas at all scales – from noctilucent clouds at the top of Earth’s atmosphere to proto-stellar and proto-planetary disks - have both magnetic fields and charged dust. • Because the addition of the charged dust modifies the properties of the plasma, current experiments have all focused on the dust – plasma interaction. • Almost all of these experiments are operated in regimes without magnetic fields or with magnetized electrons only. • With the knowledge gained from the last two decades of research, it is now possible to explore the true behavior of a dusty plasma in nature – a system that includes both charged microparticles and magnetic fields. Therefore, to advance the complete understanding of dusty plasmas, it is necessary to study fully magnetized plasmas – where first the electrons, then the ions, and finally the charged dust are confined by the magnetic field. • The presence of the magnetic field modifies all of the properties of the plasma by adding
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