Theory and Modelling activities in support of the ITER Disruption Mitigation System

The ITER Disruption Mitigation System (DMS) should ensure that heat loads,Electro Magnetic (EM) loads, and Runaway Electron (RE) impacts remain tolerable during ITER disruptions. The design of the Baseline ITER DMS, which shall be available from the beginning of ITER operation, relies on Shattered Pellet Injection (SPI). Up to 24 pellets maybe injected from 3 equatorial ports, plus 3 pellets from upper ports. Several key parameters however remain to be defined, such as the injected species, the size of the pellets or the characteristics of the flight tube front end (which determine the shattering). An international DMS Task Force (TF) has been launched in 2018 in order to urgently inform the Baseline DMS design (which has to be fixed by 2022), as well as to consider options for a possible later DMS upgrade [M. Lehnen et al., 27th IAEA FEC, Gandhinagar, India, 2018]. The DMSTF comprises 3 divisions: Technology, Experiments and Theory & Modelling (T&M). The present contribution summarizes the T&M activities.