Description and commissioning of NEXT-MM prototype: first results from operation in a Xenon-Trimethylamine gas mixture

NEXT Collaboration: V. \'Alvarez , F. Aznar , F.I.G.M. Borges , D. Calvet , S. C\'arcel , J. Castel , S. Cebri\'an , A. Cervera

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C.A.N. Conde T. Dafni T.H.V.T. Dias J. D\'iaz F. Druillole M. Egorov R. Esteve P. Evtoukhovitch L.M.P. Fernandes P. Ferrario A.L. Ferreira E. Ferrer-Ribas E.D.C. Freitas V.M. Gehman A. Gil I. Giomataris A. Goldschmidt H. G\'omez J.J. G\'omez-Cadenas D. Gonz\'alez-D\'iaz R.M. Guti\'errez J. Hauptman J.A. Hernando Morata D.C. Herrera F.J. Iguaz I.G. Irastorza M.A. Jinete L. Labarga A. Laing A. Le Coguie I. Liubarsky J.A.M. Lopes D. Lorca M. Losada G. Luz\'on A. Mar\'i J. Mart\'in-Albo A. Mart\'inez G. Mart\'inez-Lema T. Miller A. Moiseenko J.P. Mols F. Monrabal C.M.B. Monteiro F.J. Mora L.M. Moutinho J. Mu\~noz Vidal H. Natal da Luz G. Navarro M. Nebot-Guinot D. Nygren C.A.B. Oliveira R. Palma J. P\'erez J.L. P\'erez Aparicio J. Renner L. Ripoll A. Rodr\'iguez J. Rodr\'iguez P. Santos J.M.F. dos Santos L. Segui L. Serra D. Shuman A. Sim\'on C. Sofka M. Sorel J.F. Toledo A. Tom\'as J. Torrent Z. Tsamalaidze J.F.C.A. Veloso J.A. Villar R.C. Webb J.T. White N. Yahlali

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classification ⚛️ physics.ins-det

keywords firstcommissioningdescriptionlargestmixturenext-mmobtainedresults

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A technical description of NEXT-MM and its commissioning and first performance is reported. Having an active volume of ~35 cm drift $\times$ 28 cm diameter, it constitutes the largest Micromegas-read TPC operated in Xenon ever constructed, made by a sectorial arrangement of the 4 largest single wafers manufactured with the Microbulk technique to date. It is equipped with a suitably pixelized readout and with a sufficiently large sensitive volume (~23 l) so as to contain long (~20 cm) electron tracks. First results obtained at 1 bar for Xenon and trimethylamine (Xe-(2 %)TMA) mixture are presented. The TPC can accurately reconstruct extended background tracks. An encouraging full-width half-maximum of 11.6 % was obtained for ~29 keV gammas without resorting to any data post-processing.

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Description and commissioning of NEXT-MM prototype: first results from operation in a Xenon-Trimethylamine gas mixture

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