Collaborative Research: Numerical and Experimental Investigation of Turbulent Transport Control via Shaping of Radial Plasma Flow Profiles

Lehigh University, Bethlehem PA

Investigators

Abstract

This award is made in response to a proposal submitted to and reviewed under the NSF/DoE Partnership in Basic Plasma Science and Engineering joint solicitation NSF 08-589. The award provides funds to support undergraduate participation in the overall research effort, which is being funded separately by the DoE under contract number DE-FG02-09ER55022. This research aims to investigate active control of unstable fluctuations, including fully developed turbulence and the associated cross-field particle transport, via manipulation of flow profiles in a magnetized laboratory plasma device. Fluctuations and particle transport will be monitored by an array of electrostatic probes, and flow profiles controlled via a set of biased concentric ring electrodes that terminate the plasma column. The goals of the proposed research are threefold. 1. to develop a predictive code to simulate plasma transport in the linear HELCAT (HELicon-CAThode) plasma device at the University of New Mexico (UNM), where the experimental component of the proposed research will be carried out. 2. to establish the feasibility of using advanced model-based control algorithms to control cross-field turbulence-driven particle transport through appropriate manipulation of radial plasma flow profiles. 3. to investigate the fundamental nonlinear dynamics of turbulence and transport physics. The outcome of the proposed research, although focused on basic plasma physics, will have a strong impact on the scientific advancements that are needed to make nuclear fusion a viable source of energy, and will therefore produce a profound impact on an area of immense importance to the welfare of society. The proposed research will advance discovery while promoting teaching and learning. Due to its multidisciplinary nature, the proposed research plan brings together concepts from plasma physics, computational methods, and controls, with emphasis on experimental validation of the proposed modeling and control solutions. Graduate and undergraduate students will benefit from this unique multidisciplinary experience that will enhance their ability to conduct advanced research, think creatively, take advantage of unique facilities making good use of collaborative arrangements, and work in an individual capacity and as members of a team. The infrastructure for research and learning will be enhanced in each one of the collaborating institution. This collaboration will grant access to graduate and undergraduate students to the HELCAT experimental facility, where they can conduct experiments to validate the modeling and control solutions that result from their research, and will expose each one of the participating students to new research areas. The undergraduate participation adds a broader educational impact through the early-year training of students by introducing them to scientific research as a possible career path.