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A strong pumpi.ig effect has been observed with plasma operation on the toroidal graphite bumper limiter on TFTR. The pumping effect was induced by conditioning the limiter with a short series (10-20) of low density deuteriumor heliura-iniciated discharges. The density decay constant (T ) for gasfueled ohmic discharges was reduced from T > 10 s before conditioning to a minimum value of t = 0.15 s after conditioning, corresponding to a reduction in the global recycling coefficient from -1002 todoi:10.1088/0029-5515/27/8/003 fatcat:pevrwcwgjvhlllxkwrzlrvyyg4