Direct Observations of Runaways following Disruptions in JET

EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon., UKIntroduction. Runaways generated during disruptions in tokamaks can have damagingconsequences in large machines because of the high power generated by the localiseddeposition of the runaways on the vessel walls. Despite the maturity of this problem, littleinformation is available about the details of the runaway beam. In most tokamaks thepresence of the runaways only becomes apparent as they hit the vessel walls. However thereare some measurements of the synchrotron