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This Week at Physics

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Events on Monday, May 5th, 2014

Cosmology Journal Club
An Informal discussion about a broad variety of arXiv papers related to Cosmology
Time: 12:00 pm
Place: 5242 Chamberlin Hall
Abstract: Please visit the following link for more details:
    http://cmb.physics.wisc.edu/journal/index.html
Please feel free to bring your lunch!
If you have questions or comments about this journal club, would like to propose a topic or volunteer to introduce a paper, please email Le Zhang (lzhang263@wisc.edu)
Host: Peter Timbie
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Plasma Physics (Physics/ECE/NE 922) Seminar
HIT-SI Results
Time: 12:00 pm
Place: 2241 Chamberlin
Speaker: Brian Nelson, University of Washington, Seattle
Abstract: Steady inductive helicity injection (SIHI) current drive produces spheromaks with up to 90 kA toroidal current, and plasma current to injector current ratios of up to 3.8, in the Helicity Injected Torus-Steady Inductive (HIT-SI) experiment. Unlike most helicity injection methods, SIHI directly applies a periodic non-axisymmetric distortion, called Imposed Dynamo Current Drive (IDCD). IDCD eliminates the need for the plasma itself to produce non-axisymmetric relaxation mechanisms, and furthermore can be used to sustain a kink-stable equilibrium. HIT-SI creates and sustains spheromaks with equilibrium reconstructions (fitting to internal magnetic field measurements) that are ideally n=1 kink-stable. Furthermore, at injector frequencies greater than the inverse sound transit time, equilibrium fits to internal magnetics show pressure confinement with high beta, as well as exhibiting both an outward shift of the magnetic axis and improved toroidal symmetry. The high efficiency of IDCD sustaining stable equilibria with high beta, enables spheromak reactor designs with overnight capital costs competitive with present power-generating plants.
Host: John Sarff
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Condensed Matter Theory Group Seminar
Magnetization and current
Time: 4:30 pm
Place: 5310 Chamberlin Hall
Speaker: Artem Abanov, TAMU
Abstract: I will discuss ways to manipulate various magnetization textures by the
current. I will start by introducing magnetization, both static and dynamic. I
will show how magnetic domain walls can be moved by time dependent
resonant current. I will discuss the ways to measure different
properties of the magnetization textures in nano wires and nano dots,
and the ways to produce nontrivial textures with the current. The effects of
the topologically nontrivial textures in the magnetization on the current will
also be shown.

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