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This Week at Physics

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Events on Monday, November 10th, 2014

Plasma Physics (Physics/ECE/NE 922) Seminar
3D Modeling of RF Antennas, Sheaths, and Slow Waves in Time Domain
Time: 12:00 pm
Place: 2535 Engineering Hall
Speaker: David Smithe, Tech-X Corporation
Abstract:
Finite difference time domain simulation tools offer unique capability for the study of RF antennas in fusion-scale experiments, because of their traditional focus on accurate detailed representation of 3D geometry.

This talk will present our efforts to apply such a code to the modeling of antennas on MST, NSTX, CMod, and ITER. RF sheaths on or near the antenna are believed to be responsible for impurity production, a major concern for fusion experiments. These same sheath effects are also key to producing non-thermal electron populations which maintain ionization in some industrial plasmas.
The talk will show how we use sub-grid models to represent the RF and rectified sheath, and how we plan to combine this with test particles to model non-thermal physics. Finally, while performing such simulations, an observation of strong slow-wave excitation in a thin layer near the antenna has also led to questions of whether such waves might be a contributor to parasitic losses from these antennas, e.g., in NSTX. The talk will discuss this hypothesis, and on-going modeling efforts aimed at better understanding it.
Host: CPTC
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Cosmology Journal Club
An Informal discussion about a broad variety of arXiv papers related to Cosmology
Time: 12:15 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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Council Meeting
Time: 4:00 pm
Place: 2314 Chamberlin (Chair's Conference Room)
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