Dr. Nebel is now with Tibbar Technologies (branches in NY and NM).
53rd Annual Meeting of the APS Division of Plasma Physics
November 14–18, 2011; Salt Lake City, Utah
Abstract: Electrostatic Mode Locking and Mode Suppression in RFPs and Tokamaks
Richard Nebel (Tibbar Technologies)
John Finn (Los Alamos National Laboratory)
Reversed field pinchIt is possible to lock and amplify m=1 modes from the boundary in an RFP by using electrostatic fields. Furthermore, it is possible to do this without any magnetic field lines penetrating the boundary (i.e. the normal component of the magnetic field vanishes at the boundary). These can result in single-helicity or quasi-single-helicity states which have good flux surfaces. A key to forming these states is to drive the primary unstable RFP mode to large amplitude. For the unstable modes, perturbations from the boundary amplify into the interior. These same ideas can be applied to suppressing modes as well, such as the secondary m=1 modes in RFPs or edge modes in Tokamaks. We derive the required phasings to implement this scheme. We also present a conceptual feedback control scheme for suppressing instabilities.
Abstract: Two-Stream Instabilities, Debye Screening, and Resonant Electron Drive in a Modified Malmberg Trap
Allie Laird (Tibbar Technologies)
Richard Nebel (Tibbar Technologies)
The Malmberg-Penning TrapDebye screening caused by electron energy downscattering from electron-electron two-stream instabilities is being studied in a modified Malmberg Trap geometry. Theoretical studies are being conducted with Particle-In-Cell simulations. In particular, mitigation of these modes by resonant electron drive is being explored. A small experiment is being constructed in the Tibbar Technologies Bismark Device to test these concepts. The application of this work is to electrostatic confinement thermonuclear fusion.
TIBBAR TECHNOLOGIES, Los Alamos, NM
TIBBAR TECHNOLOGIES, Rochester, NY