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research article

Profile control simulations and experiments on TCV: a controller test environment and results using a model-based predictive controller

Maljaars, E.
•
Felici, F.
•
Blanken, T. C.
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2017
Nuclear Fusion

The successful performance of a model predictive profile controller is demonstrated in simulations and experiments on the TCV tokamak, employing a profile controller test environment. Stable high-performance tokamak operation in hybrid and advanced plasma scenarios requires control over the safety factor profile (q-profile) and kinetic plasma parameters such as the plasma beta. This demands to establish reliable profile control routines in presently operational tokamaks. We present a model predictive profile controller that controls the q-profile and plasma beta using power requests to two clusters of gyrotrons and the plasma current request. The performance of the controller is analyzed in both simulation and TCV L-mode discharges where successful tracking of the estimated inverse q-profile as well as plasma beta is demonstrated under uncertain plasma conditions and the presence of disturbances. The controller exploits the knowledge of the time-varying actuator limits in the actuator input calculation itself such that fast transitions between targets are achieved without overshoot. A software environment is employed to prepare and test this and three other profile controllers in parallel in simulations and experiments on TCV. This set of tools includes the rapid plasma transport simulator RAPTOR and various algorithms to reconstruct the plasma equilibrium and plasma profiles by merging the available measurements with model-based predictions. In this work the estimated q-profile is merely based on RAPTOR model predictions due to the absence of internal current density measurements in TCV. These results encourage to further exploit model predictive profile control in experiments on TCV and other (future) tokamaks.

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Type
research article
DOI
10.1088/1741-4326/aa8c48
Web of Science ID

WOS:000413867800001

Author(s)
Maljaars, E.
Felici, F.
Blanken, T. C.
Galperti, C.
Sauter, O.
De Baar, M. R.
Carpanese, F.
Goodman, T. P.
Kim, D.
Kim, S. H.
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Corporate authors
EUROfusion MST1-team; TCV-team
Date Issued

2017

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

57

Issue

12

Article Number

126063

Subjects

profile control

•

plasma profiles

•

tokamak transport

•

model predictive control

•

TCV

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
December 4, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/142540
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