From GEM to gGEM

The gyrofluid electromagnetic (GEM) model studies the phenomena in the context of edge turbulence, a matter of adding collisions and electromagnetic induction to the parallel dynamics of the standard six-moment toroidal model, the use of which was done in core turbulence works. Currently, the code describes the fluctuation free-energy conservation in a gyrofluid model by means of the polarization equation which relates E×B flow and eddy energy to combinations of the potential and the density and perpendicular temperature. To the date, GEM has usually been run on high performance computers. In this work we demonstrate its feasibility as a cluster application in a production environment based on any kind of distributed memory. The scalability and correctness of our solution has been evaluated in a local cluster. Fault tolerance and Grid suitability has been demonstrated by executing our application in the EUFORIA (EUrope Fusion fOR ITER Applications) Grid infrastructure. With this work, the fusion community is provided with a new tool to simulate plasma phenomena on the Grid. It can be employed on its own or belonging to workflows, in order to perform wider, more complex analysis of fusion reactors.