Effects of Density Control on Internal Plasma Dynamics and Current Drive in HIT-SI

ResearchWorks/Manakin Repository

Search ResearchWorks


Advanced Search

Browse

My Account

Statistics

Related Information

Effects of Density Control on Internal Plasma Dynamics and Current Drive in HIT-SI

Show full item record

Title: Effects of Density Control on Internal Plasma Dynamics and Current Drive in HIT-SI
Author: Victor, Brian Scott
Abstract: The Helicity Injected Torus with Steady Inductive Helicity Injection (HIT-SI) experiment investigates a method of current drive and spheromak formation through constant inductive helicity injection into a confinement volume of major radius 0.3 m. Using Steady Inductive Helicity Injection (SIHI) a DC plasma current is generated and formed in the confinement volume from the AC driven plasma injectors. Recent results have shown that helium plasmas can be used to condition the walls for deuterium plasmas. These deuterium plasmas have produced record toroidal currents (> 50 kA) and current amplifications (approximately 3) on HIT-SI. In addition density measurements indicate that deuterium plasmas are the first plasmas on HIT-SI to achieve a ratio of current density to electron density, j/n>10<super>-14</super> A·m, an important indication of plasma quality. Internal magnetic field measurements show these high performance plasmas have suppressed fields indicative of a region of low λ and that this region is built up and sustained during the injector drive. Currents in this low λ region that do not link the injectors---named separatrix currents---are sustained up to 40 kA. Finally a model that predicts the build up of toroidal current from the density and injector current is developed. The implication of this model is that dynamo current drive can be entirely applied and does not need to result from instabilities in the plasma.
Description: Thesis (Ph.D.)--University of Washington, 2012
URI: http://hdl.handle.net/1773/20768
Author requested restriction: No embargo

Files in this item

Files Size Format View
Victor_washington_0250E_10320.pdf 22.89Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record