Ion-induced effects in GEM and GEM/MHSP gaseous photomultipliers for the UV and...

• Autor(es): Breskin, A. ; Mörmann, D. ; Lyashenko, A. ; Chechik, R. ; Amaro, F. D. ; Maia, J. M. ; Veloso, J. F. C. A. ; Santos, J. M. F. dos
• Data: 2005
• Identificador Persistente: http://hdl.handle.net/10316/4416
• Origem: Estudo Geral - Universidade de Coimbra
• Assunto(s): Gaseous electron multipliers; Gaseous photomultipliers; Photocathodes
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

We report on the progress in the study of cascaded GEM and GEM/MHSP gas avalanche photomultipliers operating at atmospheric pressure, with CsI and bialkali photocathodes. They have single-photon sensitivity, ns time resolution and good localization properties. We summarize operational aspects and results, with the highlight of a high-gain stable gated operation of a visible-light device. Of particular importance are the results of a recent ion-backflow reduction study in different cascaded multipliers, affecting the detector's stability and the photocathode's lifetime. We report on the significant progress in ion-blocking and provide first results on bialkali-photocathode aging under gas multiplication. http://www.sciencedirect.com/science/article/B6TJM-4GY83G4-3/1/5b2fa111ff35bcc9fa45d5cbd30378bf