Operation of a double-phase pure argon Large Electron Multiplier Time Projection Chamber: comparison of single and double phase operation - Physics > Instrumentation and DetectorsReport as inadecuate




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Abstract: We constructed and operated a double phase liquid-vapour pure argon LargeElectron Multiplier Time Projection Chamber LAr LEM-TPC with a sensitive areaof 10x10 cm$^2$ and up to 30 cm of drift length. The LEM is a macroscopic holeelectron multiplier built with standard PCB techniques: drifting electrons areextracted from the liquid to the vapour phase and driven into the holes of theLEM where the multiplication occurs. Moving charges induce a signal on theanode and on the LEM electrodes. The orthogonally segmented upper face of theupper LEM and anode permit the reconstruction of X-Y spatial coordinates ofionizing events. The detector is equipped with a Photo Multiplier Tube immersedin liquid for triggering the ionizing events and an argon purification circuitto ensure long drift paths. Cosmic muon tracks have been recorded and furthercharacterization of the detector is ongoing. We believe that this proof ofprinciple represents an important milestone in the realization of very large,long drift cost-effective LAr detectors for next generation neutrino physicsand proton decay experiments, as well as for direct search of Dark Matter withimaging devices.



Author: A.Badertscher, L.Knecht, M.Laffranchi, D.Lussi, A.Marchionni, G.Natterer, P.Otiougova, F.Resnati, A.Rubbia, T.Viant

Source: https://arxiv.org/







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