Device control software design for the active support system of GMT primary mirror segments

Divya Thanasekaran; Jordi Molgó; José M. Filgueira; Alfonso Roman; Marianne Cox; William Schoenell; Pierre Kurkdjian; Charles Plubell; Tomas Krasuski; José Soto; Hector Swett; Chien Peng; Trupti Ranka; David S. Ashby; Barbara Fischer; Martí Pi

doi:10.1117/12.2562919

13 December 2020 Device control software design for the active support system of GMT primary mirror segments

Divya Thanasekaran, Jordi Molgó, José M. Filgueira, Alfonso Roman, Marianne Cox, William Schoenell, Pierre Kurkdjian, Charles Plubell, Tomas Krasuski, José Soto, Hector Swett, Chien Peng, Trupti Ranka, David S. Ashby, Barbara Fischer, Martí Pi

Author Affiliations +

Proceedings Volume 11452, Software and Cyberinfrastructure for Astronomy VI; 114523B (2020) https://doi.org/10.1117/12.2562919
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The Primary Mirror Device Control System (M1 DCS) is one of the many Device Control Systems (DCS) included in the Giant Magellan Telescope (GMT) control system and is responsible for the overall control and operation of the GMT primary mirror segments. The primary mirror is composed of seven 8.4m diameter segments, six off-axis and one in the center. The active support system of each segment comprises 170 support actuators for the off-axis segments and 154 actuators for the center segment to control the mirror figure, and 6 hardpoints to control the six degrees of freedom of rigid body motion. The software design follows a component model-based architecture, implemented using the GMT core software frameworks. Software components of the M1 DCS are specified using a custom Domain Specific Language (DSL) and inherit all key features of the core components such as communication ports, default behaviors, telemetry, logs, alarms, faults, state machines and engineering user-interface without the need of a separate implementation. The communication between the real time software and the controlled devices is implemented by an EtherCAT Fieldbus in a ring topology. This master-slave standard protocol enables the control system to reach 100 Hz closed loop rate for active support control. This paper describes the software of the M1 DCS, the tests performed with different software and hardware simulators, and the strategy to ensure software readiness with the final optical mirror.

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Divya Thanasekaran, Jordi Molgó, José M. Filgueira, Alfonso Roman, Marianne Cox, William Schoenell, Pierre Kurkdjian, Charles Plubell, Tomas Krasuski, José Soto, Hector Swett, Chien Peng, Trupti Ranka, David S. Ashby, Barbara Fischer, and Martí Pi "Device control software design for the active support system of GMT primary mirror segments", Proc. SPIE 11452, Software and Cyberinfrastructure for Astronomy VI, 114523B (13 December 2020); https://doi.org/10.1117/12.2562919

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