"Recent Advances in the Theoretical Understanding of Finite-Beta Tokamak Turbulence," by M. J. Pueschel (University of Wisconsin-Madison)

Thursday, April 9, 2015 - 1:00pm to 2:00pm
Plasma Seminars

Plasma Seminars

Physics and Astronomy Building (PAB) Room 4-330
Thursday, April 9, 2015
1-2 PM
Refreshments at 12:30PM

Guest Speaker: M. J. Pueschel (University of Wisconsin-Madison)

Talk Title: "Recent Advances in the Theoretical Understanding of Finite-Beta Tokamak Turbulence"


The plasma beta parameter is of central importance in determining fusion reactor performance. The theoretical understanding of its impact on energy confinement, in particular, has seen great advances over recent years. Here we discuss linear and nonlinear stabilization of ion temperature gradient modes through finite beta, the role of magnetic fluctuations in regulating zonal flows and thus transport, as well as the occurrence of the so-called non-zonal transition. This latter effect refers to the disabling of zonal-flow-based saturation, resulting in very large heat fluxes. Possible consequences for reactor operation in light of edge-localized modes are discussed.

PAB 4-330