JET-P(94)55

Experience of Electromagnetic Forces During JET Divertor Operation

Early 1994 a new phase of JET operation has started, after the installation of a pumped divertor. Many new components have been mounted inside the torus: four divertor coils, divertor target plates, cryopump, outboard and inboard poloidal limiters, new RT antennae (ICRH and LH), eight saddle coils for disruption control experiments, water cooling system for divertor target, various new or modified diagnostics. During disruptions and vertical displacement events (VDEs) these components and the vessel as a whole are subjected to dynamic forces due to eddy and halo currents. Estimates of electromagnetic forces expected during divertor operation were presented at the second EMF workshop. In the present paper some experimental results are described. At this stage no detailed evaluation is possible because the measurement system is limited and high resolution data recording was only available for few signals.
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