Characterization of charge spreading and gain of encapsulated resistive Micromegas detectors for the upgrade of the T2K Near Detector Time Projection Chambers

• DOI: 10.1016/j.nima.2023.168534
• Publication Date: 2023-08-07T00:18:52Z
• Authors: L. Ambrosi; D. Attié; O. Ballester; M. Batkiewicz-Kwa...; P. Billoir; A. Blanchet; A. Blondel; S. Bolognesi; R. Boullon; D. Calvet; M.P. Casado; M.G. Catanesi; M. Cicerchia; G. Cogo; P. Colas; G. Collazuol; D. D’Ago; C. Dalmazzone; T. Daret; A. Delbart; A. De Lorenzis; R. de Oliveira; S. Dolan; K. Dygnarowicz; J. Dumarchez; S. Emery-Schrenk; A. Ershova; G. Eurin; M. Feltre; C. Forza; L. Giannessi; C. Giganti; F. Gramegna; M. Grassi; M. Guigue; P. Hamacher-Baumann; S. Hassani; D. Henaff; F. Iacob; C. Jesús-Valls; S. Joshi; R. Kurjata; M. Lamoureux; A. Langella; J.F. Laporte; K. Lachner; L. Lavitola; M. Lehuraux; S. Levorato; A. Longhin; T. Lux; L. Magaletti; T. Marchi; M. Mattiazzi; B. Mehl; L. Mellet; M. Mezzetto; L. Munteanu; W. Obrȩbski; Y. Orain; M. Pari; J.-M. Parraud; C. Pastore; A. Pepato; E. Pierre; C. Pio Garcia; O. Pizzirusso; B. Popov; J. Porthault; H. Przybiliski; F. Pupilli; T. Radermacher; E. Radicioni; C. Riccio; L. Rinaldi; F. Rossi; S. Roth; L. Russo; S. Russo; A. Rychter; W. Saenz-Arevalo; Ph. Schune; L. Scomparin; D. Smyczek; J. Steinmann; S. Suvorov; J. Swierblewski; A. Teixeira; D. Terront; N. Thamm; F. Toussenel; V. Valentino; M. Varghese; G. Vasseur; E. Villa; U. Virginet; C. Vuillemin; U. Yevarouskaya; M. Ziembicki; M. Zito
• Keywords: ddc:620; electron; Physics - Instrumentation and Detectors; electronics, readout; energy resolution; FOS: Physical sciences; neutrino, oscillation; KAMIOKANDE; 7. Clean energy; 530; 01 natural sciences; High Energy Physics - Experiment; X-ray; neutrino; High Energy Physics - Experiment (hep-ex); near detector; charge; charge, readout; ionization; 0103 physical sciences; [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]; Engineering & allied operations; detector; detector, performance; near detector, upgrade; electronics; J-PARC Lab; diffusion; 500; Instrumentation and Detectors (physics.ins-det); oscillation; 620; time projection chamber; readout; upgrade; dispersion; performance; info:eu-repo/classification/ddc/620; Micromegas

An upgrade of the near detector of the T2K long baseline neutrino oscillation experiment is currently being conducted. This upgrade will include two new Time Projection Chambers, each equipped with 16 charge readout resistive Micromegas modules. A procedure to validate the performance of the detectors at different stages of production has been developed and implemented to ensure a proper and reliable operation of the detectors once installed. A dedicated X-ray test bench is used to characterize the detectors by scanning each pad individually and to precisely measure the uniformity of the gain and the deposited energy resolution over the pad plane. An energy resolution of about 10% is obtained. A detailed physical model has been developed to describe the charge dispersion phenomena in the resistive Micromegas anode. The detailed physical description includes initial ionization, electron drift, diffusion effects and the readout electronics effects. The model provides an excellent characterization of the charge spreading of the experimental measurements and allowed the simultaneous extraction of gain and RC information of the modules.