SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 12: Gamma Astronomy I

T 12.6: Vortrag

Montag, 20. März 2023, 17:45–18:00, POT/0151

Actuators for the Medium-Sized Telescopes of the Cherenkov Telescope Array — •Heiko Salzmann for the CTA MST collaboration — Sand 1, 72076 Tübingen, Germany

The Cherenkov Telescope Array (CTA) is a future ground-based observatory for gamma-ray astronomy offering unparalleled sensitivity in the energy range from 20 GeV up to 300 TeV. One array will be located in the northern hemisphere (La Palma, Canary Islands), one in the southern hemisphere (Atacama, Chile). Three different telescope types are foreseen. The Medium-Sized Telescope (MST) is covering the core energy range from 100 GeV up to 10 TeV and is currently the only type foreseen for both CTA sites in the Alpha configuration. It has a reflector with a diameter of 12 m and a tessellated mirror design of 86 mirror facets. Each mirror facet is mounted on the mirror support structure with two actuators that are adjustable in length to align the mirrors, and a freely rotating fixpoint. Image resolution and pointing accuracy constraints impose limits on the backlash and deformation of the actuators and the fixpoint under various weight and wind loads. After a short introduction into the MST mirror alignment procedure, this contribution will cover the mechanical design of the actuators, the limits on the positioning accuracy of the actuators and fixpoints as well as the verification thereof.