CHEOPS Telescope Structure

Almatech Contribution

Almatech has recently successfully developed the Optical Structure of the CHEOPS Telescope in 18 months from detailed design to the delivery of 3 fully tested models.

The mechanical requirements for the optical structure were extremely challenging, in particular regarding the on-orbit stability performance below the micrometer.

The design of this CFRP-based ultra-stable structure implied the development of fibre-level numerical simulations using data from an extensive samples testing campaign.

“CHEOPS has been a key project for Almatech and its partners since the team managed to achieve the very ambitious thermo-mechanical stability requirements set by the University of Bern. Within the very tight schedule, we succeeded to establish a set of material data and to conduct reliable FEA simulations to predict that we were theoretically able to reach a stability below one micrometer. To do so, we also had to implement new simulation tools at fiber level to increase the precision of our models. A unique alignment and test set-up allowed us to verify the theoretical performance with a physical test of the entire structure. When the stability tests results came out and showed even better numbers than our predictions, I was over the moon!”

Daniel Zindel

Almatech Principal Engineer

About the mission

The CHEOPS mission is the first S-class mission from ESA and was selected in October 2012 with a launch foreseen in the first half of 2019.

The mission is a collaboration between ESA and Switzerland. Switzerland leads the consortium of countries participating in the mission, h.f. the CHEOPS Mission Consortium (CMC), through the principal investigator (PI) Prof. Willy Benz at the University of Bern.

CHEOPS stands for CHaracterising ExO Planet Satellite. It is a small photometric observatory to be launched into low Earth orbit to measure transits of Exo-planets. The mission’s main science goals are to measure the bulk density of super-Earths and Neptunes orbiting bright stars and provide suitable targets for future in-depth characterisation studies of exoplanets in these mass and size ranges.

The CHEOPS mission (Credit ESA)

thermo-elastic stability over 5°C

mass budget

duration of the project


Analytical optimization and test validation of the submicron dimensional stability of the CHEOPS space telescope’s CFRP structure,

Blecha; D. Zindel; H. Cottard; T. Beck; V. Cessa; C. Broeg; F. Ratti; N. Rando
Presented at the SPIE 2016 conference