Fast tomographic methods for the tokamak ISTTOK
- Associacao Euratom/IST Centro de Fusao Nuclear, Instituto Superior Tecnico 1049-001 Lisboa (Portugal)
- Max-Planck-Institut fuer Plasma Physik, EURATOM Ass., 17491 Greifswald (Germany)
- Max-Planck-Institut fuer Plasma Physik, EURATOM Ass., 85748 Garching (Germany)
The achievement of long duration, alternating current discharges on the tokamak IST-TOK requires a real-time plasma position control system. The plasma position determination based on magnetic probes system has been found to be inadequate during the current inversion due to the reduced plasma current. A tomography diagnostic has been therefore installed to supply the required feedback to the control system. Several tomographic methods are available for soft X-ray or bolo-metric tomography, among which the Cormack and Neural networks methods stand out due to their inherent speed of up to 1000 reconstructions per second, with currently available technology. This paper discusses the application of these algorithms on fusion devices while comparing performance and reliability of the results. It has been found that although the Cormack based inversion proved to be faster, the neural networks reconstruction has fewer artifacts and is more accurate.
- OSTI ID:
- 21137020
- Journal Information:
- AIP Conference Proceedings, Vol. 996, Issue 1; Conference: 17. IAEA technical meeting on research using small fusion devices, Lisbon (Portugal), 22-24 Oct 2007; Other Information: DOI: 10.1063/1.2917011; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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