In this article, we describe the current status of the development of TROIA ∗, a pyramid wavefront sensor
based adaptive optics system designed for DAG, a new 4 m telescope located in Eastern Anatolia, Turkey. The
wavefront uses a no-noise electron-multiplied CCD camera, and the deformable mirror has a large actuators
density, allowing coronagraphic science in one hand, but also system optimization for low light level or bad
seeing conditions thanks to the versatility of the P-WFS. We describe the optical design, the mounting and
alignment procedure and our loop control concept. Closed loop results are described, showing that while there
are still many issues to fix before the sky version, the system behaves as expected.
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