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Design, characterization and installation of the NEXT-100 cathode and electroluminescence regions

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arxiv 2311.03528 v2 pith:H72KRMJA submitted 2023-11-06 physics.ins-det

Design, characterization and installation of the NEXT-100 cathode and electroluminescence regions

NEXT Collaboration: K. Mistry , L. Rogers , B.J.P. Jones , B. Munson , L. Norman , C. Adams , H. Almaz\'an , V. \'Alvarez
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B. Aparicio A.I. Aranburu L. Arazi I.J. Arnquist F. Auria-Luna S. Ayet C.D.R. Azevedo K. Bailey F. Ballester M. del Barrio-Torregrosa A. Bayo J.M. Benlloch-Rodr\'iguez F.I.G.M. Borges A. Brodolin N. Byrnes S. C\'arcel A. Castillo S. Cebri\'an E. Church L. Cid C.A.N. Conde T. Contreras F.P. Coss\'io E. Dey G. D\'iaz T. Dickel C. Echevarria M. Elorza J. Escada R. Esteve R. Felkai L.M.P. Fernandes P. Ferrario A.L. Ferreira F.W. Foss E.D.C. Freitas Z. Freixa J.J. G\'omez-Cadenas R. Gonz\'alez J.W.R. Grocott R. Guenette K. Hafidi J. Hauptman C.A.O. Henriques J.A. Hernando~Morata P. Herrero-G\'omez V. Herrero C. Herv\'es Carrete Y. Ifergan L. Larizgoitia A. Larumbe P. Lebrun F. Lopez N. L\'opez-March R. Madigan R.D.P. Mano A.P. Marques J. Mart\'in-Albo G. Mart\'inez-Lema M. Mart\'inez-Vara Z.E. Meziani R.L. Miller J. Molina-Canteras F. Monrabal C.M.B. Monteiro F.J. Mora K.E. Navarro P. Novella A. Nu\~nez D.R. Nygren E. Oblak D. Oliver J. Palacio B. Palmeiro A. Para I. Parmaksiz J. Pelegrin M. P\'erez Maneiro M. Querol A.B. Redwine J. Renner I. Rivilla C. Rogero B. Romeo C. Romo-Luque F.P. Santos J.M.F. dos Santos M. Seemann I. Shomroni A. Sim\'on S.R. Soleti M. Sorel J. Soto-Oton J.M.R. Teixeira J.F. Toledo J. Torrent A. Trettin A. Us\'on J.F.C.A. Veloso J. Waiton A. Yubero
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classification physics.ins-det
keywords next-100regioninstallationamplificationbreakdowncathodecharacterizationcharge
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NEXT-100 is currently being constructed at the Laboratorio Subterr\'aneo de Canfranc in the Spanish Pyrenees and will search for neutrinoless double beta decay using a high-pressure gaseous time projection chamber (TPC) with 100 kg of xenon. Charge amplification is carried out via electroluminescence (EL) which is the process of accelerating electrons in a high electric field region causing secondary scintillation of the medium proportional to the initial charge. The NEXT-100 EL and cathode regions are made from tensioned hexagonal meshes of 1 m diameter. This paper describes the design, characterization, and installation of these parts for NEXT-100. Simulations of the electric field are performed to model the drift and amplification of ionization electrons produced in the detector under various EL region alignments and rotations. Measurements of the electrostatic breakdown voltage in air characterize performance under high voltage conditions and identify breakdown points. The electrostatic deflection of the mesh is quantified and fit to a first-principles mechanical model. Measurements were performed with both a standalone test EL region and with the NEXT-100 EL region before its installation in the detector. Finally, we describe the parts as installed in NEXT-100, following their deployment in Summer 2023.

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  1. Electroluminescence Yield Measurements in Xenon Gas with the NEXT-DEMO++ Detector

    physics.ins-det 2026-04 unverdicted novelty 5.0

    Electroluminescence yield measurements in xenon reveal a modest 5% change in the slope of the reduced yield Y/p above 5 bar pressure.