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Section: New Results

Massive gaz Injection

Participant : Boniface Nkonga.

The massive injection of impurity gas into a plasma has been proved to reduce forces and localized thermal loads caused by disruptions in tokamaks. This mitigation system is routinely used on JET to shut down plasmas with a locked mode. The DMV's injectors of JET have been modelled with all the 3D details (see Figure 1, 2 and 3) . We have performed many 3D simulations and the predicted flight times are in accordance with experimental measurements. Moreover, the computations give also a clear domain for the application of 1D approximations and scaling.

Figure 1. DMV resevoir of the JET Tokamak
IMG/visit0045.png
Figure 2. Reservoir, tube and plasma front of the Injection system of JET.
IMG/visit0186.png
Figure 3. 3D Mesh of tetrahedral elements.
IMG/MeshT.png