Gonzalez-Diaz, DiegoAlvarez, V.Borges, F. I. G.Camargo, M.Carcel, S.Cebrian, S.Cervera, A.Conde, C. A. N.Dafni, T.Diaz, J.Esteve, R.Fernandes, L. M. P.Ferrari, P.Ferreira, A. L.Freitas, E. D. C.Gehmani, V. M.Goldschmidt, A.Gomez-Cadenas, J. J.Gutierrez, R. M.Hauptman, J.Hernando Morata, J. A.Herrera, D. C.Irastorza, I. G.Labarga, L.Laing, A.Liubarsky, I.Lopez-March, N.Lorca, D.Losada, M.Luzon, G.Mari, A.Martin-Albo, J.Martinez-Lema, G.Martinez, A.Miller, T.Monrabal, F.Monserrate, M.Monteiro, C. M. B.Mora, F. J.Moutinho, L. M.Munoz Vidal, J.Nebot-Guinot, M.Nygren, D.Oliveira, C. A. B.Perez, J.Perez Aparicio, J. L.Querol, M.Renner, J.Ripoll, L.Rodriguez, J.Santos, F. P.dos Santos, J. M. F.Serra, L.Shuman, D.Simon, A.Sofka, C.Sorel, M.Toledo, J. F.Torrent, J.Tsamalaidze, Z.Veloso, J. F. C. A.Villar, J. A.Webb, R.White, J. T.Yahlali, N.Azevedo, C.Aznarab, F.Calvet, D.Castel, J.Ferrer-Ribas, E.Garcia, J. A.Giomataris, I.Gomez, H.Iguaz, F. J.Lagraba, A.Le Coguie, A.Mols, J. P.Rodriguez, A.Ruiz-Choliz, E.Segui, L.Tomas, A.Veenhof, R.2024-08-132024-08-132015-12-210168-9002https://doi.org/10.1016/j.nima.2015.08.033https://hdl.handle.net/11452/43978We report the performance of a 10 atm Xenon/trimethylamine time projection chamber (TPC) for the detection of X-rays (30 keV) and gamma-rays (0.511-1.275 MeV) in conjunction with the accurate tracking of the associated electrons. When operated at such a high pressure and in similar to 1%-admixtures, trimethylamine (TMA) endows Xenon with an extremely low electron diffusion (1.3 +/- 0.13 mm-sigma (longitudinal), 0.95 +/- 0.20 mm-sigma (transverse) along 1 m drift) besides forming a convenient Penning-Fluorescent' mixture. The TPC, that houses 1.1 kg of gas in its fiducial volume, operated continuously for 100 live-days in charge amplification mode. The readout was performed through the recently introduced microbulk Micromegas technology and the AFTER chip, providing a 3D voxelization of 8 mm x 8 mm x 1.2 mm for approximately 10 cm/MeV-long electron tracks. Resolution in energy (epsilon) at full width half maximum (R) inside the fiducial volume ranged from R = 14.6% (30 keV) to R = 4.6% (1.275 MeV).This work was developed as part of the R&D program of the NEXT collaboration for future detector upgrades in the search of the neutrino-less double beta decay (beta beta 0 nu) in Xe-136, specifically those based on novel gas mixtures. Therefore we ultimately focus on the calorimetric and topological properties of the reconstructed MeV-electron tracks. In particular, the obtained energy resolution has been decomposed in its various contributions and improvements towards achieving the R =1.4%root MeV/epsilon levels obtained in small sensors are discussed.enTrimethylamineFluctuationsDouble-beta decayGamma and electron detectionMicrobulk micromegasTime projection chamberHigh pressure xenon-trimehylaminePenning-fluorescent mixturesScience & technologyTechnologyPhysical sciencesInstruments & instrumentationNuclear science & technologyPhysics, nuclearPhysics, particles & fieldsInstruments & instrumentationNuclear science & technologyPhysicsArticle00036413370000282480410.1016/j.nima.2015.08.033