A study of hydrogen isotopes fuel control by wall effect in magnetic fusion devices

•A particle balance model for the main plasma and wall inventory in magnetic fusion device has been represented.•The dependence of incident particles energy on the wall has been considered in 10–300 eV for the sputtering yield and recycling coefficient.•The effect of fueling methods on plasma density behavior has been studied.

Determination of plasma density behavior in magnetic confinement system needs to study the plasma materials interaction in the facing components such as first wall, limiter and divertor. Recycling of hydrogen isotope is an effective parameter in plasma density rate and plasma fueling. Recycling coefficient over the long pulse operation, gets to the unity, so it has a significant effect on steady state in magnetic fusion devices. Typically, sputtered carbon atoms from the plasma facing components form hydrocarbons and they redeposit on the wall. In this case little rate of hydrogen loss occurs. In present work a zero dimensional particle equilibrium model has been represented to determine particles density rate in main plasma and wall inventory under recycling effect and codeposition of hydrogen in case of continues and discontinues fueling methods and effective parameters on the main plasma decay has been studied.