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The dynamics of the positive ions created by particle interactions insideargon time projection chambers plays an important role in characterizing thenext generation of massive detectors planned for the direct search for darkmatter and the study of neutrino properties. We have constructed a 1 L liquidargon chamber (ARION: ARgon ION experiment) with a high voltage pulse generatorcapable of injecting, in a controlled manner, a sizeable ion current into thedrift region. This chamber is capable of reproducing a volume charge similar tothat found in large detectors, allowing its effects to be studiedsystematically. New experimental results regarding ion dynamics in the liquidand direct demonstration of ion feedback from the gas to the liquid arediscussed in this paper. In addition, a novel technique to measure the driftvelocity of argon ions is introduced along with preliminary results obtained ingas.

Experimental study of the positive ion feedback from gas to liquid in a dual-phase argon chamber and measurement of the ion mobility in argon gas