[en] Parameteric surveys are conducted to investigate the effects of particle source profiles in the steady state of an ignited D-T tokamak plasma on the particle confinement time, the helium ash accumulation and the particle flux. The reference reactor envisaged is the INTOR-J having poloidal divertors with major axis of 5 m and minor radius of 1.2 m. The helium ash accumulation increases gradually for the helium recycling fraction R sub(α) less than about 0.8 and rapidly for R sub(α) > 0.8. It is possible to reduce considerably the required pumping speed by raising the recycling fraction to about 0.8 without an appreciable enhancement in β-value. (author)