Topic/Type: 1.2 Fusion Plasmas (magnetic & inertial confinement), Poster
S. Fujii1, T. Ohshima1, T. Takahashi1, N. Fukumoto2, M. Nagata2
1 Gunma University, 1-5-1 Tenjin-cho, Kiryu 376-8515, Japan
2 University of Hyogo, Himeji 671-2201, Japan
Fueling into the core of a burning plasma is an important issue for both the profile and shape control. Conventional fueling methods, such as pellet injection and gas puffing, need more injection speed for a fusion plasma. By the compact torus (CT) injection method, the injection speed can exceed 100 km/s. Although it is high enough, however, feasibility is still unclear because of the difficulty of the transport process of a plasmoid across the vertical field. If the accelerated CT plasma is neutralized, the problem of magnetic interaction is resolved. A Monte-Carlo method is employed to reproduce the charge-exchange process between a neutral gas atom and a plasma ion. We investigate numerically neutralization efficiency, which depend on the pressure of neutralizing gas and the injection speed of the CT plasma.