Operational Limits and Limiting Instabilities in Tokamak Machines

This article outlines the constraints for operation of tokamaks. The operating space is restricted by several limitations among which the plasma performance has to be optimized. Hard limits which lead ultimately to a disruption and may damage the first wall as well as soft limits resulting in a reduction of the energy content (and the available fusion power) of the plasma can occur. The operational limits can be summarized in two general groups: excessive radiation from the plasma, and violation of global as well as local MHD boundaries.