First results are reported on the prediction of disruptions in one tokamak, based on neural networks trained on
another tokamak. The studies use data from the JET and ASDEX Upgrade devices, with a neural network trained
on just seven normalized plasma parameters. In this way, a simple single layer perceptron network trained solely
on JET correctly anticipated 67% of disruptions on ASDEX Upgrade in advance of 0.01 s before the disruption.
The converse test led to a 69% success rate in advance of 0.04 s before the disruption in JET. Only one overall time
scaling parameter is allowed between the devices, which can be introduced from theoretical arguments. Disruption
prediction performance based on such networks trained and tested on the same device shows even higher success
rates (JET, 86%; ASDEX Upgrade, 90%), despite the small number of inputs used and simplicity of the network.
It is found that while performance for networks trained and tested on the same device can be improved with more
complex networks and many adjustable weights, for cross-machine testing the best approach is a simple single layer
perceptron. This offers the basis of a potentially useful technique for large future devices such as ITER, which
with further development might help to reduce disruption frequency and minimize the need for a large disruption
campaign to train disruption avoidance systems.