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Modeling
Toolset for Dynamic Resistive-Wall-Mode Discrimination and Feedback
Control Design--FAR-TECH, Inc., 10350 Science Center Drive,
Building 14, Suite 150, San Diego, CA 92121-1129;
858-455-6655, www.far-tech.com
Dr.
Jin-Soo Kim, Principal Investigator,
Dr.
Jin-Soo Kim, Business Official,
DOE
Grant No. DE-FG02-03ER83657
Amount:
$749,999
The Resistive Wall Mode (RWM) is a major instability
that limits performance in current and projected future advanced tokamaks. Active
control of the RWM using external coils to cancel RWM magnetic flux has been
shown effective in stabilizing the mode. The
control scheme requires both accurate isolation of the mode flux from the total
flux and accurate modeling of system responses to the mode flux.
This project will develop a flexible desktop tool to facilitate the
calculation of the mutual couplings of the plasma-wall-coil-sensor system in a
three-dimensional toroidal geometry that can be easily modified to test
different systems. The tool also
will facilitate the construction of system-response models for effective RWM
detection. In Phase I, a vacuum field code was modified to
model the resistive wall and RWM structure as current eigenmodes.
The extended code was then designed to calculate the mutual
plasma-wall-coil-sensor couplings in a flexible manner, so that alternative
geometries can be easily implemented. Phase
II will: (1) optimize the RWM identification and control toolset, including the
expansion of its functionality for more general use; (2) validate the toolset,
including real-time vacuum and plasma tests; and (3) automate the toolset in an
experimental facility, and develop packaging materials, including a user’s
guide.
Commercial
Applications and Other Benefits as
described by awardee: The
modeling toolset should provide a flexible desktop tool for system-response
modeling of active feedback. The nature of the tool should allow it to be easily
used by researchers for a variety of systems, enabling its quick application to
any current or future tokamak.