Performance of a micro-channel plates position sensitive detector

Abstract : The absolute detection efficiency of large area micro-channel plates (MCPs) detectors has been measured with $^{6}$Li$^{+}$ and $^{23}$Na$^{+}$ ions in the 0.5–7.5 keV energy range. Two detectors of 47mm and 83mm active diameter have been tested. They consist in a pair of MCPs mounted in a chevron configuration with delay line anodes for position readout. The efficiency saturates above 3000 eV, reaching a value of 52.3(3)%, consistent with the MCPs geometry. The behaviour of the efficiency with respect to the ion kinetic energy is ascribed to the electronic threshold, through a detailed analysis of the collected charge distribution. The efficiency dependence on the ions impact position and incidence angle has also been studied. A loss of efficiency has been observed in the vicinity of the MCPs bias angle, which can be avoided if a large post-acceleration field is created in front of the MCPs. Finally the study of a position calibration is presented. A position resolution of 110(26) mm has been achieved.
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Submitted on : Monday, October 10, 2005 - 10:06:07 AM
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E. Liénard, M. Herbane, G. Ban, G. Darius, P. Delahaye, et al.. Performance of a micro-channel plates position sensitive detector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2005, 551, pp.375-386. ⟨10.1016/j.nima.2005.06.069⟩. ⟨in2p3-00024846⟩



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