Plasma Physics (Physics/ECE/NE 922) Seminars |
Events During the Week of April 13th through April 20th, 2025
Monday, April 14th, 2025
- "A Ritz variational principle for local collisionless gyrokinetic instabilities"
- Time: 12:00 pm - 1:15 pm
- Place: 1227 Engineering Hall
- Speaker: Cole Stephen, University of Texas at Austin
- Abstract: Turbulence driven by gyrokinetic instabilities is largely responsible for transport in magnetic fusion devices. To estimate this turbulent transport, integrated modeling codes often use mixing length estimates in conjunction with reduced models of the linearized gyrokinetic equation. One common method of formulating and solving the linearized gyrokinetic eigenvalue problem equation uses a Ritz variational principle, particularly in the local collisionless limit. However, the variational principle as typically stated in the literature is mathematically incorrect. In this work, we derive a mathematically correct form of the variational principle that applies to local linear collisionless gyrokinetics in general geometry with electromagnetic effects. We also explicitly derive a weak form of the gyrokinetic field equations suitable for numerical applications.
- Host: Prof. Adelle Wright
Tuesday, April 15th, 2025
- No events scheduled
Wednesday, April 16th, 2025
- No events scheduled
Thursday, April 17th, 2025
- No events scheduled
Friday, April 18th, 2025
- No events scheduled