Simulation of divertor detachment characteristics in JT-60 with superconducting coils

The capability of detachment control in JT-60SC is demonstrated with a divertor code (SOLDOR/NEUT2D). Under the standard operation of the core edge density at 95% of the minor radius, nedge=3.2×1019 m−3, the power flow from the core plasma Qe=Qi=6 MW, and the conductance of inner and outer cryopanels Cin=Cout=50 m3/s, the inner divertor plasma is partially detached and the outer divertor plasma attached. The inner divertor can be changed from partially detached to attached plasma by inner pump of 150 m3/s. The fully detached inner divertor is obtained in high density operation with nsep>4×1019 m−3, where nsep is the density at the separatrix outer midplane, The elastic collision in a dense and cold divertor plasma (ne⩾5×1020 m−3, Te<5 eV) play an important role on detachment.