Absolute detection efficiency of a microchannel plate detector for keV energy ions

H. C. Straub, M. A. Mangan, B. G. Lindsay, K. A. Smith, and R. F. Stebbings

Rev. Sci. Instrum. 70, 4238-4240 (1999)

Measurements of the absolute detection efficiency of a commercial microchannel plate detector for keV energy ions are presented. The detector comprises two microchannel plates mounted in front of a resistive anode. It is found that when the detector is appropriately biased, and the ion impact energy is sufficiently high, ions with masses up to 131 amu are detected with equal efficiency and that this efficiency may remain constant over a period of years.