Simultaneous Control of Electron Density and Effective Atomic Number in Tokamak Plasmas.

Author:   Patrick Boyle
Publisher:   Proquest, Umi Dissertation Publishing
ISBN:  

9781243410566


Pages:   58
Publication Date:   01 September 2011
Format:   Paperback
Availability:   In stock   Availability explained
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Simultaneous Control of Electron Density and Effective Atomic Number in Tokamak Plasmas.


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Overview

The regulation of plasma ion densities in tokamak fusion reactors is a critical aspect of fusion reaction rate control. Precise regulation of hydrogen and impurity densities, or alternatively electron density and effective atomic number, is required during operation. A common means of actuation toward this end is the use of fast-acting gas valves for the injection of different species. The limitations of these actuation mechanisms introduce nonlinearities and time delays into the control inputs. The inputs must be positive and bounded since the actuators cannot remove particles, but only inject them up to a specific rate. The effective input is also delayed by the time needed for the injected species to ionize and diffuse through the plasma. These input limitations, coupled with the nonlinear dynamics of the controlled variables, can lead to undesired oscillations and instabilities when single-input-single-output (SISO) linear controllers are used. Several multi-input-multi-output (MIMO) controllers are proposed to overcome the undesired behaviors in the simultaneous control of plasma electron density and effective atomic number. Nonlinear controllers are devised using simplified zero-dimensional plasma density models and are tested in zero-dimensional simulations.

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Author:   Patrick Boyle
Publisher:   Proquest, Umi Dissertation Publishing
Imprint:   Proquest, Umi Dissertation Publishing
Dimensions:   Width: 20.30cm , Height: 0.40cm , Length: 25.40cm
Weight:   0.136kg
ISBN:  

9781243410566


ISBN 10:   1243410566
Pages:   58
Publication Date:   01 September 2011
Audience:   General/trade ,  General
Format:   Paperback
Publisher's Status:   Active
Availability:   In stock   Availability explained
We have confirmation that this item is in stock with the supplier. It will be ordered in for you and dispatched immediately.

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