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Nonlinear, real-time optimization for actuator management in tokamaks

Journal Article · · Fusion Engineering and Design
 [1];  [2];  [3];  [2];  [2]
  1. Lehigh University, Bethlehem, PA (United States); General Atomics, San Diego, CA (United States); General Atomics
  2. General Atomics, San Diego, CA (United States)
  3. Lehigh University, Bethlehem, PA (United States)
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Experiments in DIII-D have been carried out to test a novel actuator management approach in tokamaks. Here, the actuator management scheme is posed as a nonlinear-optimization problem in which the actuator commands are calculated in real time according to the changing control priorities, plasma state, and actuator availability. Such optimization problem is solved using the augmented Lagrangian method, combined with a gradient projection method and a conjugate-gradient iteration algorithm. The algorithmic approach followed in this work does not depend on the particular control objectives or actuators considered, which facilitates its integration with other independently-designed control components within a plasma-control system. In addition, the actuator-management algorithm is able to handle the optimization problem in a computationally efficient manner, making it suitable for real-time implementations. Initial DIII-D results in the steady-state high-qmin scenario have demonstrated the capabilities of the actuator manager to perform both simultaneous multiple mission and repurposing sharing, which will be required in ITER.
Research Organization:
General Atomics, San Diego, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
FC02-04ER54698; SC0010661
OSTI ID:
2293573
Alternate ID(s):
OSTI ID: 2229500
Journal Information:
Fusion Engineering and Design, Journal Name: Fusion Engineering and Design Vol. 198; ISSN 0920-3796
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (7)

DIII-D Research to Prepare for Steady State Advanced Tokamak Power Plants journal September 2018
Actuator allocation for integrated control in tokamaks: architectural design and a mixed-integer programming algorithm journal November 2017
Tokamak-agnostic actuator management for multi-task integrated control with application to TCV and ITER journal October 2019
Control of neoclassical tearing modes in DIII–D journal May 2002
Novel aspects of plasma control in ITER journal February 2015
Implementing a finite-state off-normal and fault response system for disruption avoidance in tokamaks journal March 2018
Integrated Robust Control of Individual Scalar Variables in Tokamaks conference December 2019

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Actuator management
Nonlinear optimization
Tokamak control