Plasma Physics (Physics/ECE/NE 922) Seminars |
Events During the Week of November 9th through November 15th, 2014
Monday, November 10th, 2014
- 3D Modeling of RF Antennas, Sheaths, and Slow Waves in Time Domain
- Time: 12:00 pm - 1:00 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
Tuesday, November 11th, 2014
- No events scheduled
Wednesday, November 12th, 2014
- No events scheduled
Thursday, November 13th, 2014
- No events scheduled
Friday, November 14th, 2014
- No events scheduled