STUDIES OF FUELING, PARTICLE-TRANSPORT AND IMPURITY BEHAVIOR IN THE GAMMA-10 TANDEM MIRROR

In this paper we describe the experimental results on the evaluation o f fueling in the central region of the GAMMA 10 tandem mirror on the b asis of the neutral pressure balance, plasma spectroscopy and atomic a nd molecular processes with numerical simulations. Quasi steady-state plasmas are achieved by optimizing the combination of gas puffing and ICRF pulse, which simplify the quantitative evaluation of fueling. The total fueling in the central region deduced from the pressure measure ment near the plasma boundary is compared with the amount of end-toss flux which is measured by an end loss analyzer (ELA). It is found that the amount of fueling increases slightly with the ICRF power due to t he enhancement of recycling in the central region and agrees well with the behavior of end-loss flux. Results of impurity-injection experime nts are also described from the viewpoint of recycling processes.