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

V. Álvarez 1 F. Aznar F. I. G. M. Borges D. Calvet S. Cárcel J. Castel S. Cebrián 2 A. Cervera C. A. N. Conde 3 T. Dafni 2 T. H. V. T. Dias J. Diaz 4 F. Druillole 5 M. Egorov R. Esteve 6 P. Evtoukhovitch L. M. P. Fernandes 3 P. Ferrario A. L. Ferreira E. Ferrer-Ribas 5 E. D. C. Freitas V. M. Gehman A. Gil I. Giomataris 5 A. Goldschmidt H. Gómez 7 J. J. Gómez-Cadenas D. González-Díaz R. M. Gutiérrez 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. Luzón 2 A. Marí J. Martín-Albo A. Martínez 8 G. Martínez-Lema T. Miller A. Moiseenko J. P. Mols 5 F. Monrabal C. M. B. Monteiro 3 F. J. Mora L. M. Moutinho J. Muñoz Vidal H. Natal da Luz G. Navarro M. Nebot-Guinot D. Nygren C. A. B. Oliveira R. Palma 9 J. Pérez J. L. Pérez Aparicio J. Renner L. Ripoll A. Rodríguez 10 J. Rodríguez 11 P. Santos J. M. F. Dos Santos L. Segui 2 L. Serra D. Shuman A. Simón C. Sofka M. Sorel J. F. Toledo A. Tomás 2 J. Torrent Z. Tsamalaidze J. F. C. A. Veloso 3 J. A. Villar R. C. Webb J. T. White N. Yahlali
Abstract : 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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Submitted on : Friday, June 20, 2014 - 3:46:37 PM
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V. Álvarez, F. Aznar, F. I. G. M. Borges, D. Calvet, S. Cárcel, et al.. Description and commissioning of NEXT-MM prototype: first results from operation in a Xenon-Trimethylamine gas mixture. Journal of Instrumentation, IOP Publishing, 2014, 9, pp.P03010. ⟨10.1088/1748-0221/9/03/P03010⟩. ⟨in2p3-01010815⟩

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