Experimental vertical stability studies for ITER performance and design guidance

D. A. Humphreys, T. A. Casper, N. Eidietis, M. Ferrara, D. A. Gates, I. H. Hutchinson, G. L. Jackson, Egemen Kolemen, J. A. Leuer, J. Lister, L. L. Lodestro, W. H. Meyer, L. D. Pearlstein, A. Portone, F. Sartori, M. L. Walker, A. S. Welander, S. M. Wolfe

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Abstract

Operating experimental devices have provided key inputs to the design process for ITER axisymmetric control. In particular, experiments have quantified controllability and robustness requirements in the presence of realistic noise and disturbance environments, which are difficult or impossible to characterize with modelling and simulation alone. This kind of information is particularly critical for ITER vertical control, which poses the highest demands on poloidal field system performance, since the consequences of loss of vertical control can be severe. This work describes results of multi-machine studies performed under a joint ITPA experiment (MDC-13) on fundamental vertical control performance and controllability limits. We present experimental results from Alcator C-Mod, DIII-D, NSTX, TCV and JET, along with analysis of these data to provide vertical control performance guidance to ITER. Useful metrics to quantify this control performance include the stability margin and maximum controllable vertical displacement. Theoretical analysis of the maximum controllable vertical displacement suggests effective approaches to improving performance in terms of this metric, with implications for ITER design modifications. Typical levels of noise in the vertical position measurement and several common disturbances which can challenge the vertical control loop are assessed and analysed.

Original languageEnglish (US)
Article number115003
JournalNuclear Fusion
Volume49
Issue number11
DOIs
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Humphreys, D. A., Casper, T. A., Eidietis, N., Ferrara, M., Gates, D. A., Hutchinson, I. H., Jackson, G. L., Kolemen, E., Leuer, J. A., Lister, J., Lodestro, L. L., Meyer, W. H., Pearlstein, L. D., Portone, A., Sartori, F., Walker, M. L., Welander, A. S., & Wolfe, S. M. (2009). Experimental vertical stability studies for ITER performance and design guidance. Nuclear Fusion, 49(11), [115003]. https://doi.org/10.1088/0029-5515/49/11/115003