Rubin M2 support system integration and verification on the TMA

The M2 secondary mirror of the Vera C. Rubin Observatory will be the first 3.4 m active mirror to see the sky in 2024. Here, we report on the integration, testing and verification of the M2 surrogate with the M2 cell, initially in the integration hall and subsequently on the Telescope Mount Assembly, including the M2 light baffle installation inside the dome. We report on the complex installation procedure and the three test campaigns that encompass the characterization of a wide spectrum of M2 cell functionalities, such as the actuator's behavior in terms of maximum stroke and force limits, inner and outer control loop mode behavior, active and un-powered support of the M2, rigid body motion repeatability, motion limits, and lookup tables optimization.