The Cherenkov Telescope Array (CTA) project aims to create the next generation Very High Energy (VHE) gamma-ray
telescope array. It will be devoted to the observation of gamma rays over a wide band of energy, from a few tens of GeV
to more than 100 TeV. Two sites are foreseen to view the whole sky where about 100 telescopes, composed of three
different classes, related to the specific energy region to be investigated, will be installed. Among these, the Small Size
class of Telescopes, SSTs, are devoted to the highest energy region, to beyond 100 TeV. Due to the large number of
SSTs, their unit cost is an important parameter.
At the Observatoire de Paris, we have designed a prototype of a Small Size Telescope named SST-GATE, based on the
dual-mirror Schwarzschild-Couder optical formula, which has never before been implemented in the design of a
telescope. Over the last two years, we developed a mechanical design for SST-GATE from the optical and preliminary
mechanical designs made by the University of Durham. The integration of this telescope is currently in progress.
Since the early stages of mechanical design of SST-GATE, finite element method has been used employing shape and
topology optimization techniques to help design several elements of the telescope. This allowed optimization of the
mechanical stiffness/mass ratio, leading to a lightweight and less expensive mechanical structure. These techniques and
the resulting mechanical design are detailed in this paper. We will also describe the finite element analyses carried out to
calculate the mechanical deformations and the stresses in the structure under observing and survival conditions.