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FP7

Scattering-matrix arc detection on the JET ITER-like ICRH antenna

Funded under: FP7-EURATOM

Abstract

Operating ion cyclotron resonance heating (ICRH) antennas at high power density puts them at risk of arcing which reduces the coupled power to the plasma because the perturbed impedance match triggers the voltage standing wave ratio (VSWR) based generator trip system but even worse might damage the antenna beyond repair because of the arc's localised energy deposition. New antennas are designed to operate in a load tolerant way which creates low impedance zones that are especially at risk since the existing VSWR protection systems are less sensitive to arcs in these areas. To protect these low impedance areas, a new arc protection system referred as scattering matrix arc detection (SMAD) has been proposed. This paper describes the basic operating principle and implementation in hard- and software for the JET ITER-like antenna (ILA), with testbed and preliminary JET commissioning results.

Additional information

Authors: VRANCKEN M, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);DUMORTIER P, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);DURODIE F, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);EVRARD M, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);HUYGEN S, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);LERCHE E A, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);VAN ESTER D, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);VERVIER M, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);ARGOUARCH A, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BLACKMAN T, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);GRAHAM M, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);JACQUET PH, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);KAYE A, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);NIGHTINGALE M P S, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);GOULDING R H, Oak Ridge National Laboratory, Oak Ridge (US)
Bibliographic Reference: An oral paper given at: 25th Symposium on Fusion Technology - (SOFT-25) Organised by: Max-Planck-Institut für Plasmaphysik Held at: HanseMesse Rostock (DE)
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/doi:10.1016/j.fusengdes.2008.11.035
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