Comparison of fast tomographic methods for application on the Soft X-Ray Tomography System on Wendelstein 7-X stellarator

Journal Article · Wed Mar 19 04:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2909100· OSTI ID:21136898

Carvalho, P J; Coelho, R; Fernandes, H ^[1]; Thomsen, H; Geiger, J; Weller, A ^[2]; Gori, S; Toussaint, U von ^[3]

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1. Associacao Euratom/IST Centro cle Fusao Nuclear, Instituto Superior Tecnico 1049-001 Lisboa (Portugal)
2. Max-Planck-Institut fuer Plasma Physik, EURATOM Assoziation, 17491 Greifswald (Germany)
3. Max-Planck-Institut fuer Plasma Physik, EURATOM Assoziation, 85748 Garching (Germany)

The Wendelstein 7-X stellarator, presently under construction in Greifswald, is foreseen to operate on a steady state regime. Under such a scenario, a constant diagnosis of the plasma characteristics is strongly envisaged. A X-Ray Tomography diagnostic is a particularly useful tool since a poloidal cross-section of the plasma's X-Ray emissivity can be reconstructed and the plasma's position as well as MHD activity can be inferred.Fast tomographic algorithms such as the Cormack inversion or neural networks (NN) can be applied to obtain recon-structions at a human time scale (10{approx}100 reconstructions per second). This paper discusses the potential application of these algorithms on the Wendelstein 7-X stellarator by comparing performance and reliability of the results. The NN reconstruction has proven to be faster and more reliable than the Cormack's.

• OSTI ID: 21136898
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 993; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPARATIVE EVALUATIONS
COMPUTERIZED TOMOGRAPHY
EMISSIVITY
MAGNETOHYDRODYNAMICS
NEURAL NETWORKS
PERFORMANCE
PLASMA
PLASMA DIAGNOSTICS
SOFT X RADIATION
STEADY-STATE CONDITIONS
WENDELSTEIN-7 STELLARATOR