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The Medium Energy X-ray telescope (ME) is one of the three main telescopes onboard the Insight Hard X-ray Modulation Telescope (Insight-HXMT) astronomysatellite. ME contains 1728 pixels of Si-PIN detectors sensitive in 5-30 keVwith a total geometrical area of 952 cm2. Application Specific IntegratedCircuit (ASIC) chips, VA32TA6, is used to achieve low power consumption and lowreadout noise. The collimators define three kinds of field of views (FOVs) forthe telescope, 1{\deg}{\times}4{\deg}, 4{\deg}{\times}4{\deg}, and blockedones. Combination of such FOVs can be used to estimate the in-orbit X-ray andparticle background components. The energy resolution of ME is ~3 keV at 17.8keV (FWHM) and the time resolution is 255 {\mu}s. In this paper, we introducethe design and performance of ME.

The Medium Energy (ME) X-ray telescope onboard the Insight-HXMT astronomy satellite