ITER disruption mitigation requirements and development of gas cartridge concept

ITER is designed to withstand a certain number of full scale plasma disruptions. Each disruption event induces excessive thermal loads, electromagnetic (EM) loads and runaway electrons onto the vacuum vessel and in-vessel components; the consequences of unmitigated events are extremely serious in terms of component lifetimes. This paper describes the preliminary requirements for the disruption mitigation system (DMS), possible approaches to mitigate the disruption in ITER, the schemes compatible with ITER operation and an on-going pre-conceptual study on gas cartridge DMS, which is one of the massive gas injection DMS schemes.