System and Launch
The Alphabus Qualification Review is currently ongoing and is planned to be closed by end November. This review will confirm the qualification of the service module as a generic product line.
The results of the Shogun shock testing campaign show that Alphabus globally complies with the Ariane 5 launch environment requirement. Using the measurements inside the spacecraft, the prime team reassessed the qualification of each unit by comparing its qualification test at unit level to the level expected in flight. The positive results of this assessment were delivered at a final meeting on 17 September between the Alphabus Prime contractor Astrium and Thales Alenia Space, and ESA/CNES.
Service Module (SM)
Activities on the Service Module integration are progressing nominally; the electric propulsion system gas plate has been delivered to Toulouse, integrated on the SM and the proof test, covering the Xenon high pressure part has been performed in the Astrium bunker facility. Furthermore, thermal control and MLI have been successfully integrated on the SM. In parallel the battery modules have been mounted on the East / West SM walls and full battery level tests have started. The Closed Loop System (CLS) test equipment has been delivered to Toulouse on 8 September. The CLS will be connected to the spacecraft for preparation for the end-to-end system level test campaign.
Remaining activities on the SM include:
• Final CPS completion (last SM thruster integration and functional testing)
• Integration of PSR PFM
• Re-integration of refurbished STRs
• Integration of fourth reaction wheel
• Final electrical and functional testing
• XPS Thruster module assembly (TMA) / SM interface testing prior to TMA integration in the repeater module
These activities are planned to be completed by the end of the year for an SM ready for coupling with the Repeater Module.
The Alphabus Extension will further extend the capability of the platform in terms of power, mass and thermal rejection capabilities. The workplan includes the development of key enabling technologies such as a deployable panel radiator for increased heat dissipation and an ultra stable antenna module for future complex Alphabus satellites. The industrial proposal has been received end of July, evaluated by ESA/CNES and is currently under clarification / negotiation with the objective of placing the industrial contract before the end of the year.