Gain characteristics of a 100 mu m thick GEM in Krypton-CO2 mixtures

Author(s)

Roque, R. C. ^[1] ; Natal da Luz, H. ^[2] ; Carramate, L. F. N. D. ^[3] ; Azevedo, C. D. R. ^[3] ; Mir, J. A. ^[1] ; Amaro, F. D. ^[1]

Affiliation

^[1] Univ Coimbra, LIBPhys Dept Phys, Rua Larga, Coimbra - Portugal

^[2] Univ Sao Paulo, Inst Fis, Rua Matao 1371, Sao Paulo - Brazil

^[3] Univ Aveiro, Phys Dept I3N, Campus Univ Santiago, Aveiro - Portugal

• Document type: Journal article
• Source: Journal of Instrumentation; v. 12, DEC 2017.
• Web of Science Citations: 1

Abstract

The operation of a Micropattern Gaseous Detector (MPGD) comprising a cascade of two non-standard Gas Electron Multipliers (GEM) made from a 100 mu m kapton foil was evaluated in pure krypton and in krypton-CO2 mixtures. The final avalanche charge was collected in a 2D strip readout, providing an active area of 10 x 10 cm(2) for the entire detection system. For each mixture, the effective gain and energy resolution were measured as a function of the electric field in the drift, transfer and induction regions. Using X-rays from a Fe-55 radioactive source (5.9 keV), gains close to 10(4) and energy resolution of 22% (FWHM) were achieved in pure krypton under stable conditions, showing the potential of the experimental setup for the following imaging studies. (AU)

• FAPESP's process: 16/05282-2 - Development and applications of Micropattern gaseous detectors
• Grantee: Pedro Hugo Ferreira Natal da Luz
• Support Opportunities: Research Grants - Young Investigators Grants