Calculation of runaway electrons stopping power in ITER

The energy loss rate of runaway electrons (RE) was analysed for ITER plasma facing components materials (Be and W). The stopping power, the energy deposition profiles, and the material erosion are estimated by using the codes MEMOS and ENDEP. The latter has been updated by including the effect of the target's polarizability. Our calculations show that this effect is significant for high RE energies and low Z materials such as Be. We also find that the conversion of the RE's magnetic energy into heat can explain the temperature rise on dump plate in JET. In the case of ITER, the calculated heat deposition due to RE is almost two times the melting threshold energy of Be but well below that of W.