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FP5

Sensitivity of the ITER tokamak closed loop control system to variations in the assumed model

Funded under: FP5-EAECTP C

Abstract

A new Monte Carlo approach to estimating the effect of model uncertainty on the closed loop behaviour of the ITER plasma equilibrium control system has been tested. Different parts of the model were modified to quantify the effect of model uncertainties in the presence of input saturation in the closed loop. The results allow us to confirm that the typical precision of the measured inductive part of the plasma-less plasma equilibrium response model will be adequate to ensure that the obtained control performance in the presence of such uncertainties will not be significantly different to the modelled performance. The resistive part of the electromagnetic response model has a significant effect on the control performance, via the open loop growth rate, as should be expected. The control performance is equally sensitive to variations of the unstable pole, caused by uncertainties in the plasma part of the model, again as expected. The work demonstrates that if the value of the unstable pole is close to the modelled value, the performance of the control system in rejecting perturbations should be unaffected by slight modelling errors in the remaining parts of the model.

Additional information

Authors: SCHARZ B, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Federale de Lausanne (CH);SCHÄRZ B, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);BUGNION L, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);LISTER J B, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);FAVEZ J-Y, EPFL-12S-LA, Lausanne (CH)
Bibliographic Reference: A paper published as an appendix in EPFL Internal Report LRP 741/02, December 2002, pp.17.
Availability: Available free of charge from: École Polytechnique Fédérale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne. Fax: +41-21-6934747.
Record Number: 200315850 / Last updated on: 2003-01-31
Category: PUBLICATION
Original language: en
Available languages: en
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