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The ICARUS T600 detector, the largest liquid Argon Time Projection Chamber(LAr-TPC) realized after many years of RD activities, was installed andsuccessfully operated for 3 years at the INFN Gran Sasso undergroundLaboratory. One of the most important issues was the need of an extremely lowresidual electronegative impurity content in the liquid Argon, in order totransport the free electrons created by the ionizing particles with a verysmall attenuation along the drift path. The solutions adopted for the Argonre-circulation and purification systems have permitted to reach impressiveresults in terms of Argon purity and a free electron lifetime exceeding 15 ms,corresponding to about 20 parts per trillion of equivalent O2 contamination, amilestone for any future project involving LAr-TPC's and the development ofhigher detector mass scales.

Experimental observation of an extremely high electron lifetime with the ICARUS-T600 LAr-TPC