Evaluation of translation velocity control by auxiliary coils for the collisional merging formation of FRCs by 2-D resistive MHD simulation

Previously, the collisional merging formation of FRCs has been developed to generate high performance FRCs. A drastic increase in the excluded flux and total temperature were observed in the FRCs generated with this technique; furthermore, these phenomena strongly depend on the translation velocity of individual plasmoids. However, the dependence of the merged-FRC performance on the translation velocity has not been studied in detail. To study the dependence, the effect of installed auxiliary coils on the formation region on the translation velocity of FRCs in the FAT-CM device has been evaluated by the simulation with a two-dimensional resistive magnetohydrodynamics code, which is called Lamy Ridge. The control of translation velocity by using the auxiliary coils has beenwas demonstrated on the order of several tens of km/s in the simulation. The trapped poloidal flux and the total temperature of simulated FRCs have increased depending on the translation velocity.