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Electromechanical modelling and design for phase control of locked modes in the DIII-D tokamak.
- Source :
- Plasma Physics & Controlled Fusion; Apr2016, Vol. 58 Issue 4, p1-1, 1p
- Publication Year :
- 2016
-
Abstract
- A basic nonlinear electromechanical model is developed for the interaction between a pre-existing near-saturated tearing-mode, a conducting wall, active coils internal to the wall, and active coils external to the wall. The tearing-mode is represented by a perturbed helical surface current and its island has a small but finite moment of inertia. The model is shown to have several properties that are qualitatively consistent with the experimental observations of mode-wall and mode-coil interactions. The main purpose of the model is to guide the design of a phase control system for locked modes (LMs) in tokamaks. Such a phase controller may become an important component in integrated disruption avoidance systems. A realistic feedback controller for the LM phase is designed and tested for the electromechanical model. The results indicate that a simple fixed-gain controller can perform phase control of LMs with a range of sizes, and at arbitrary misalignment relative to a realistically dimensioned background error field. The basic model is expected to be a useful minimal dynamical system representation also for other aspects of mode-wall-coil interactions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 07413335
- Volume :
- 58
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Plasma Physics & Controlled Fusion
- Publication Type :
- Academic Journal
- Accession number :
- 113685057
- Full Text :
- https://doi.org/10.1088/0741-3335/58/4/045008