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SUMMARY:2012 Fall Seminar Series - Dr. Daniel Dubin - Physics in novel regimes using Nonneutral Plasmas
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:Abstract:=0D=0A=
Nonneutral  plasmas  consisting  of particles with only a single sign=0D=0A=
of charge (e.g.,  pure electron, pure positron, or pure ion plasmas) can=0D=0A=
be confined for days or even  weeks using the static electric and=0D=0A=
magnetic fields of a Penning trap.  These novel plasma systems can=0D=0A=
access regimes unavailable to neutral plasmas. For instance, they have=0D=0A=
been cooled to cryogenic temperatures without recombination, where they=0D=0A=
can form strongly-coupled nonneutral liquid or crystalline states. Theory and experiments have explored=0D=0A=
 the structure of these novel condensed matter systems. Also, they are confined by=0D=0A=
 strong magnetic fields, allowing access to  several novel strongly-magnetized regimes. In one such regime, =0D=0A=
where the plasma is strongly magnetized but weakly-coupled,=0D=0A=
the cross-magnetic field thermal conductivity is predicted and observed to be independent of magnetic field strength,=0D=0A=
 a surprising result.  In a second strongly-magnetized and strongly-coupled regime, the interparticle =0D=0A=
collision physics can be fruitfully compared to nuclear reactions in high energy=0D=0A=
 density astrophysical plasmas such as those found in =0D=0A=
the interior of a supernova progenitor. This comparison has allowed the first  laboratory measurements of=0D=0A=
 dense plasma enhancements to nuclear reaction rates.=0D=0A=
=0D=0A=
References:=0D=0A=
D. Dubin and T. O'Neil, "Trapped nonneutral plasma, liquids and crystals (the thermal equilibrium states), Rev. Mod. Phys. 71, 87 (1999)=0D=0A=
T. B. Mitchel et al., "Direct Observations of Structural Phase Transitions in Planar Crystallized Ion Plasmas", Science 282, 1290 (1998)=0D=0A=
E. M. Hollman, F. Anderegg and C. F. Driscoll, "Measurement of Cross-Magnetic Field Heat Transport in  a Pure Ion PLasma, Phys. Rev. Lett. 82, 4839 (1999)=0D=0A=
D. Dubin, "Modelling Nuclear Fusion in Dense Plasmas Using a Cryogenic Nonneutral Plasma", Phys. Plasmas 15, 055705 (2008)=0D=0A=
F. Anderegg et al., "Mesaurment of Correlation-Enhanced Collision Rates Using Pure Ion Plasmas:, Phys. Plasmas 17, 055702 (2010)=0D=0A=
=0D=0A=
=0D=0A=
Bio:=0D=0A=
Dr. Dubin completed his undergraduate degree in theoretical physics in 1978 at Queen's University in Kingston, Ontario. He then enrolled in the plasma physics program at Princeton University. Dr. Dubin then joined the nonneutral plasma group at the University of California, San Diego. His chief research interest is the basic physics of nonneutral plasmas. This has led to investigations in several related areas, including 2D fluid dynamics, dusty plasmas, nonequilibrium statistical physics, and structural condensed matter physics. Dr. Dubin is now a professor in the physics department at UCSD. He is a Fellow of the American Physical Society and a recipient of the John Dawson Award for Excellence in Plasma Physics Research.=0D=0A=

LOCATION:Baylor Science Building, Room: E 231
DTSTART;TZID=US_Central:20121012T133000
DTEND;TZID=US_Central:20121012T143000
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