ITER will install a
Figure 1. CAD-model of an ITER vacuum vessel sector showing a set of twelve injectors installed in equatorial port plug #2 (middle) and one injector in the upper port plug #2. A significant fraction of the equipment is dedicated to services providing cryogenic coolant, vacuum pumping, and process gases.
Some highlights of these activities are:
February 2023 at ITER Headquarters: In addition to the in-person participants at the Technology Group Meeting of the ITER Disruption Mitigation System Task Force, approximately 40 experts were connected remotely.
The ITER disruption mitigation system is an extremely complex, highly integrated, state-of-the-art plant system combining many different technologies. Whilst disruption mitigation has always been envisaged on ITER, previous conceptual systems had been based on the rapid injection of massive quantities of gas. Only in recent years has it become clear, through R&D on tokamaks within the ITER Members, that a shattered pellet system would be required to meet the unique demands of disruption mitigation at the ITER scale. The disruption mitigation system technology program, despite being launched only in 2020, has made tremendous progress in such a short time, showing the power of bringing together experts across a broad range of disciplines into a highly coordinated and focused effort. The February meeting has shown that the technical realization of this challenging technology project is indeed feasible. Activities will now push forward to culminate in a full design validation of the system in preparation for the disruption mitigation system final design review planned for 2024.
Figure 2. Examples of the various activities to support the design of the ITER disruption mitigation system: (a) cryostat and cold head to perform fundamental studies (CEA-Grenoble, France); (b) gas flow modelling for propellant suppressor (CASPUS, U.K.); (c) cut away of the optical pellet diagnostic's front-end optics with modelled light rays for the different observation branches (Fusion Instruments, Hungary); (d) pellet impacting target for trajectory measurements (ORNL, US); (e) simulation of pellet fragmentation validated against experiments (EMI-Fraunhofer, Germany); (f) Support Laboratory for component testing (EK-CER, Hungary); (g) cryostat with porous cold head for fast pellet formation (PELIN, Russia).