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Contract EFDA/00-551. Final report - Executive summary

Funded under: FP5-EAECTP C


The 2-page Executive Summary reports on work carried out at the CRPP-EPFL, Lausanne, Switzerland, in the context of the D424-E ITER Design Task on Plasma Control Issues. The scientific body of the report, describing the work carried out, is in the form of four appendices, which cover:
- The effect of the feedback controller on the superconducting tokamak AC losses.
- AC-CRPP user manual.
- Sensitivity of the ITER tokamak closed loop control system to variations in the assumed model.
- ITER divertor sweep AC loss estimation.

The first phase of the work was the development of a simplified model of the AC losses in ITER. This allowed the primary goal to be addressed, namely the sensitivity of the AC losses to the feedback controller design parameters. As expected, reducing the responsivity reduces the AC coupling losses. Results from the third study indicate that the vertical instability is the primary parameter, which causes changes to the closed loop performance. In the final study, the model was used to examine the limits of divertor sweeping, with results that suggest that power spreading might contribute to protecting the divertor.

Additional information

Authors: LISTER J B ET AL, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);ZAPRETILINA E, JCT Naka and Efrimov Institute, St Petersburg (RU)
Bibliographic Reference: EPFL internal report LRP 741/02, December 2002, pp.73.
Availability: Available free of charge from: École Polytechnique Fédérale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne. Fax: +41-21-6934747.
ISBN: ISSN: 0458-5895
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