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

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arxiv 1409.5592 v3 pith:MXC3OM5C submitted 2014-09-19 physics.ins-det

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

classification physics.ins-det
keywords argonlar-tpcdetectorelectronextremelyfreelifetimeliquid
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 and successfully operated for 3 years at the INFN Gran Sasso underground Laboratory. One of the most important issues was the need of an extremely low residual electronegative impurity content in the liquid Argon, in order to transport the free electrons created by the ionizing particles with a very small attenuation along the drift path. The solutions adopted for the Argon re-circulation and purification systems have permitted to reach impressive results in terms of Argon purity and a free electron lifetime exceeding 15 ms, corresponding to about 20 parts per trillion of equivalent O2 contamination, a milestone for any future project involving LAr-TPC's and the development of higher detector mass scales.

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