Hydrogen Recycling in a Long-Pulse Discharge Plasma on the Tandem Mirror GAMMA I0

A gas dynamic pressure calculation was modified in order to investigate hydrogen recycling under quasi-steady state condition in the long-pulse discharge plasma of GAMMA 10. We estimated the temporal behavior of the fueling rate of the recycling from wall surface by a gas dynamic pressure analysis. It is found that the hydrogen recycling enhances with the ion temperature in the GAMMA 10 central cell. The quantity of the wall recycling was also estimated by using DEGAS neutral particle transport simulation. The wall recycling deduced from DEGAS fairly agree with that by the dynamic pressure analysis.