Plasma Movement at ELMs in JET

摘要

1. During ELMs forces in the range 10-100kN act on the plasma. These might arise from SOL currents.rn2. These forces move the plasma by a few cm.rn3. Since the movement is comparable to the plasma wall gap, it has implications for plasma purity and first wall safety in large devices.rn4. The impulse on the plasma can account for vertical instabilities which sometimes follow large ELMs.