[en] Particle collection experiments with a modular pump limiter in TORE SUPRA, for ohmic and additional power heating, are reported. The essential feature of these experiments is that the pressure built up in the pump limiter plenum is only driven by the hydrogen influx whereas the total ion influx in the throat is shown to be partly due to impurities. This is consistent with experimental results which show similar evolution of Z_eff in the plasma and of the ratio Γ_T/p of the total ion influx Γ_T in the throat to the pressure p in the plenum. Particle collection efficiency, in terms of hydrogen influx Γ_D to the pressure ratio Γ_D/p, is shown to be roughly constant over the density (ohmic) and additional power ranges studied