University of Tokyo
University of Tokyo
University of Tokyo
Japan Aerospace Exploration Agency Institute of Space and Astronautical Science
University of Tokyo
The Mercury's Sodium Atmosphere Spectral Imager (MSASI) on Mercury Magnetospheric Orbiter (MMO)/BepiColombo is under development. MSASI is a high-dispersion spectrometer working in the spectral range around sodium D2 emission. The detector unit employs an Image Intensifier which has two-stage Micro Channel Plate (MCP). In this paper, we report the results of performance test for the Image Intensifier. We have focused on the following points. (1) Spectral resolution. (2) Dependency of Dark-Counts on temperature. (3) Radiation tolerance of phosphor (P46). (4) Tolerance for aging against incident flux.