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Abstract

Real-time control of many plasma parameters will be an essential aspect in the development of reliable high performance operation of next step tokamaks. The main prerequisites for any feedback scheme are the precise real-time determination of the quantities to be controlled, requiring top quality and highly reliable diagnostics, and the availability of robust control algorithms. A new set of real-time diagnostics was recently implemented on JET to prove the feasibility of determining, with high accuracy and time resolution, the most important plasma quantities. Some of the signals now routinely provided in real time at JET are: (i) the internal inductance and the main confinement quantities obtained by calculating the Shafranov integrals from the pick-up coils with 2ms time resolution; (ii) the electron temperature profile, from electron cylotron emission every 10 ms; (iii) the ion temperature and plasma toroidal velocity profiles, from charge exchange recombination spectroscopy, provided every 50 ms; and (iv) the safety factor profile, derived from the inversion of the polarimetric line integrals every 2 ms. With regard to feedback algorithms, new model-based controllers were developed to allow a more robust control of several plasma parameters.

Additional information

Authors: MURARI A, Associazione Euratom-ENEA sulla Fusione, Consorzio RFX, Padova (IT);BARANA O, Associazione Euratom-ENEA sulla Fusione, Consorzio RFX, Padova (IT);JOFFRIN E, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);MAZON D, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);LABORDE L, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);MOREAU D, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);FELTON R, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ZABEO L, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);PICCOLO F, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);SARTORI F, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ALBANESE R, Associazione Euratom-ENEA-CREATE, Univ. Mediterranea RC, Loc. Feo di Vito (IT);ARENA P, Associazione Euratom-ENEA-CREATE, Univ. di Catania (IT);BRUNO M, Associazione Euratom-ENEA-CREATE, Univ. di Catania (IT);AMBROSINO G, Associazione Euratom-ENEA-CREATE, Univ. Napoli Federico II, Napoli (IT);ARIOLA M, Associazione Euratom-ENEA-CREATE, Univ. Napoli Federico II, Napoli (IT);CRISANTI F, Associazione Euratom-ENEA sulla Fusione, Centro.Richerche Energia ENEA-Frascati, Frascati (IT);DE LA LUNA E, Associacion EURATOM CIEMAT para Fusion, Madrid (ES);SANCHEZ J, Associacion EURATOM CIEMAT para Fusion, Madrid (ES)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion 47 (2005) 395�407
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: stacks.iop.org/PPCF/47/395
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