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

7 NEMO
LAL - Laboratoire de l'Accélérateur Linéaire
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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Journal articles

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Submitted on : Friday, June 20, 2014 - 3:46:37 PM
Last modification on : Friday, September 10, 2021 - 3:32:46 AM

### Citation

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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