Plasma position and current control system enhancements for the JET ITER-like wall |
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| Affiliation: | 1. Associazione EURATOM-ENEA-CREATE, Univ. di Napoli Federico II, Via Claudio 21, 80125 Napoli, Italy;2. Ass. EURATOM-IST, Instituto de Plasmas e Fusão Nuclear, IST, 1049-001 Lisboa, Portugal;3. Associazione EURATOM-ENEA-CREATE, Via Claudio 21, 80125 Napoli, Italy;4. Euratom-CCFE, Culham Science Centre, OX14 3DB Abingdon, UK;1. Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8, Czech Republic;2. Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Praha 8, Czech Republic;3. Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;4. Department of Physical Electronics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, V Holešovičkách 2, 180 00 Praha 8, Czech Republic;1. École Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas, Association EURATOM-Suisse, 1015 Lausanne, Switzerland;2. Eindhoven University of Technology, Department of Mechanical Engineering, Control Systems Technology Group, P.O. Box 513, 5600MB Eindhoven, The Netherlands;3. National Laboratory of Fusion, EURATOM-CIEMAT, Madrid, Spain;4. Department of Automatic Control and Systems Engineering, Bilbao University of the Basque Country, Bilbao, Spain;5. FOM-Institute DIFFER, Association EURATOM-FOM, Nieuwegein, The Netherlands;1. Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany;2. ITER Organization, Route de Vinon sur Verdon, CS 90046, 13067, St Paul-lez-Durance, France;3. General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA;4. CREATE/Università di Napoli Federico II, Napoli, Italy;5. Association CEA pour la Fusion Contrôlée, CEA Cadarache − 13108 St Paul les Durance − France;6. CCFE Fusion Association, Culham Centre for Fusion Energy, Culham Science Centre, Oxfordshire, OX14 3DB, UK |
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| Abstract: | The upgrade of Joint European Torus (JET) to a new all-metal wall, the so-called ITER-like wall (ILW), has posed a set of new challenges regarding both machine operation and protection. The plasma position and current control (PPCC) system plays a crucial role in minimizing the possibility that the plasma could permanently damage the ILW. The installation of the ILW has driven a number of upgrades of the two PPCC components, namely the Vertical Stabilization (VS) system and the Shape Controller (SC). The VS system has been enhanced in order to speed up its response and to withstand larger perturbations. The SC upgrade includes three new features: an improved termination management system, the current limit avoidance system, and the PFX-on-early-task. This paper describes the PPCC upgrades listed above, focusing on the implementation issues and on the experimental results achieved during the 2011–12 JET experimental campaigns. |
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| Keywords: | Plasma axisymmetric magnetic control JET tokamak ITER-like wall Real-time systems |
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