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Abstract

The increasing importance of real-time measurements and control systems in JET experiments, regarding e.g. Internal Transport Barrier (ITB) and q-profile control, has motivated the development of a real-time motional Stark effect (MSE) system. The MSE diagnostic allows the measurement of local magnetic fields in different locations along the neutral beam path providing, therefore, local measurement of the current and q-profiles. Recently in JET, an upgrade of the MSE diagnostic has been implemented, incorporating a totally new system which allows the use of this diagnostic as a real-time control tool as well as an extended data source for off-line analysis. This paper will briefly describe the technical features of the real-time diagnostic with main focus on the system architecture, which consists of a VME crate hosting three PowerPC processor boards and a fast ADC, all connected via Front Panel Data Port (FPDP). The DSP algorithm implements a lockin-amplifier required to demodulate the JET MSE signals. Some applications for the system will be covered such as: feeding the real-time equilibrium reconstruction code (EQUINOX) and allowing the full coverage analysis of the Neutral Beam time window. A brief comparison between the real-time MSE analysis and the off-line analysis will also be presented.

Additional information

Authors: ALVES D, Associação EURATOM/IST, Centro de Fusão Nuclear, Instituto Superior Técnico, Lisboa (PT);FERNANDES H, Associação EURATOM/IST, Centro de Fusão Nuclear, Instituto Superior Técnico, Lisboa (PT);STEPHEN A, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon (UK);HAWKES N, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon (UK);DALLEY S, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon (UK);GOODYEAR A, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon (UK);FELTON R, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon (UK);JOFFRIN E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Fusion Engineering and Design (2004); Volume 71, Issues 1-4, Pages 175-181
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://www.sciencedirect.com/science/journal/09203796
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