Modelling the behaviour of microbulk Micromegas in xenon/trimethylamine gas

Ruiz-Choliz, E. (Universidad de Zaragoza) ; González-Díaz, D. ; Diago, A. ; Castel, J. (Universidad de Zaragoza) ; Dafni, T. (Universidad de Zaragoza) ; Herrera, D.C. ; Iguaz, F.J. (Universidad de Zaragoza) ; Irastorza, I.G. (Universidad de Zaragoza) ; Luzón, G. (Universidad de Zaragoza) ; Mirallas, H. ; Sahin, O. ; Veenhof, R.

Resumen: We model the response of a state of the art micro-hole single-stage charge amplification device ('microbulk' Micromegas) in a gaseous atmosphere consisting of xenon/trimethylamine at various concentrations and pressures. The amplifying structure, made with photo-lithographic techniques similar to those followed in the fabrication of gas electron multipliers (GEMs), consisted of a 100 mu m-side equilateral-triangle pattern with 50 pm-diameter holes placed at its vertexes. Once the primary electrons are guided into the holes by virtue of an optimized field configuration, avalanches develop along the 50 [an-height channels etched out of the original doubly copper-clad polyimide foil. In order to properly account for the strong field gradients at the holes' entrance as well as for the fluctuations of the avalanche process (that ultimately determine the achievable energy resolution), we abandoned the hydrodynamic framework, resorting to a purely microscopic description of the electron trajectories as obtained from elementary cross-sections. We show that achieving a satisfactory description needs additional assumptions about atom-molecule (Penning) transfer reactions and charge recombination to be made.

Idioma: Inglés

DOI: 10.1016/j.nima.2015.07.062

Año: 2015

Publicado en: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 799 (2015), 137-146
ISSN: 0168-9002

Factor impacto JCR: 1.2 (2015)

Categ. JCR: NUCLEAR SCIENCE & TECHNOLOGY rank: 9 / 32 = 0.281 (2015) - Q2 - T1
Categ. JCR: SPECTROSCOPY rank: 28 / 43 = 0.651 (2015) - Q3 - T2
Categ. JCR: INSTRUMENTS & INSTRUMENTATION rank: 31 / 56 = 0.554 (2015) - Q3 - T2
Categ. JCR: PHYSICS, PARTICLES & FIELDS rank: 24 / 28 = 0.857 (2015) - Q4 - T3

Factor impacto SCIMAGO: 0.965 - Instrumentation (Q1) - Nuclear and High Energy Physics (Q2)

Financiación: info:eu-repo/grantAgreement/EC/FP7/ 240054/EU/Novel Developments in Time Projection Chambers (TPCs) for Rare Event Searches in Underground Astroparticle EXperiments/TREX
Financiación: info:eu-repo/grantAgreement/ES/MICINN/CPAN-CSD2007-00042
Financiación: info:eu-repo/grantAgreement/ES/MINECO/Consolider-Ingenio-2010/CSD2008-00037
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2008-03456
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2009-13697
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2011-24058
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FPA2013-41085-P

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Proy. investigación HCA (Dpto. Física Teórica)
Área (Departamento): Área Física Atóm.Molec.y Nucl. (Dpto. Física Teórica)