15th Plasma Surface Interactions

Simulation Analysis of Divertor Characteristics in JT-60 with Superconducting Coils

K. Shimizu, T. Takizuka, S. Sakurai, H. Tamai, H. Takenaga, H. Kubo and Y. Miura
Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, 311-0193, JAPAN

Abstract.
The capability of detachment control in JT-60SC is demonstrated with a divertor code (SOLDOR/NEUT2D). Under the standard operation of the edge density n_edge=3.2x10¹⁹m^-3, the power flow from the core plasma Q_e=Q_i=6 MW, and the conductance of inner and outer cryopanels C_in=C_out=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 n_sep > 4x10¹⁹ m^-3. The elastic collision in a dense and cold divertor plasma (n_e > 10²⁰ m^-3, T_e < 5 eV) play an important role on detachment.