Evaluation of deuterium recycling properties by fueling termination in the EAST superconducting tokamak

•Hydrogen recycling properties have been investigated by evaluating the density decay time after the fueling termination.•A repeat of discharges diminishes the wall conditioning effect and enhances hydrogen recycling.•Approach of the strike point position to the pumping slot enhances the particle exhaust capability.•The hydrogen recycling coefficient of the LHCD discharge is increased during stop of fueling, although such increase appears not to be seen in the ohmic discharges.