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Physics and Astronomy Space Plasma Seminar - Dustin Fisher, Dartmouth College

Title: "3D Two-Fluid Braginskii Simulations of the Large Plasma Device"

Tuesday, April 7, 2015
4:00pm – 5:00pm
Wilder 111
Intended Audience(s): Public
Categories: Lectures & Seminars
Abstract: The Large Plasma Device (LAPD) is modeled using the 3D Global Braginskii Solver code (GBS).
Comparisons to experimental measurements are made in the low-bias regime in which there is an
intrinsic ExB rotation of the plasma due to sheath effects. Comparisons show good agreement with
the data obtained from LAPD. Kelvin Helmholtz (KH) turbulence at relatively large scales is the
dominant driver of cross-field transport in these simulations with smaller-scale drift waves
playing a secondary role. Plasma holes and blobs arising from KH vortices in the simulations are
consistent with the scale sizes and overall appearance of those in LAPD camera images. The addition
of ion-neutral collisions in the simulations at previously theorized values reduces the radial particle flux
by about a factor of two. This reduction is due to a modest stabilizing contribution of the collisions on
the KH-modes driving the turbulent transport. Current work exploring the high-bias regime will be briefly
discussed.
For more information, contact:
Tressena Manning
tressena.a.manning@dartmouth.edu
603-646-2854
Permanent URL to this event: https://physics.dartmouth.edu/events/event?event=34036

Events are free and open to the public unless otherwise noted.