Operation of MHSP multipliers in high pressure noble-gas

• Autor(a) principal: Amaro, F.D.
• Data de Publicação: 2007
• Outros Autores: Veloso, J. F. C. A., Breskin, A., Chechik, R., Santos, J. M. F. dos
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: https://proa.ua.pt/index.php/revdeti/article/view/17217

We report on the performance of a Micro-Hole & Strip Plate (MHSP) electron multiplier operating in pure Xe, Kr, Ar and Ne at the pressure range of 1 to 6 bar and in Ar – Xe mixtures at pressures ranging from 1 to 7 bar. The maximal gains at 1 bar Xe and Kr are 5*104 and 105, respectively; they drop by about one order of magnitude at 2bar and by almost another order of magnitude at 5-6 bar; they reach gains of 500 and 4000 at 5 bar in Xe and Kr, respectively. In Ar, the gain varies very little with pressure, from 3*103 to 9*103; in Ne the maximum attainable gain, about 105, is pressure independent above 2 bar. The results are compared with that of single- and triple-GEM multipliers operated in similar conditions. Potential applications are in hard X-ray imaging and in cryogenic radiation detectors. In the Ar - Xe mixture no significant reduction of the maximum achievable gain was measured. Absolute gains of 1–4*103 were reached in Ar/50 mbar Xe over this pressure range from 1 to 7 bar. Energy resolutions between 14% and 16% were reached for 6 keV X-rays.