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Medium size telescopes for the Cherenkov Telescope Array

The Cherenkov Telescope Array (CTA) is the next generation ground-based observatory for gamma-ray astronomy at very high energies in the range from 20 GeV to 300 TeV.1 In order to cover the entire sky an observatory with two telescope arrays is planned, one in the southern hemisphere and one in the northern hemisphere. Each site will combine imaging air Cherenkov telescopes of different sizes and designs to cover the very wide energy range. These sites will complement each other, providing full-sky coverage for galactic and extra-galactic sources. At least three telescope types are required to cover the full CTA energy range in a cost-effective way. The sensitivity in the core energy range between 150 GeV and 5 TeV will be dominated by up to 40 Medium Size Telescopes (MSTs) distributed over both observatory sites. It is intended to equip the MSTs with FlashCam and NectarCAM cameras. This document describes the aspects of the MST design and the status of commissioning and performance validation of the individual assemblies.