Measuring Segment Piston with a Non-Redundant Pupil Mask on the Giant Magellan Telescope

Marcos Van Dam, Peter Tuthill, Anthony Cheetham
2015
The Giant Magellan Telescope (GMT) consists of seven 8.365 m segments with a separation of 0.345 m. A unique challenge for GMT lies in phasing these segments and, in particular, how to measure segment piston optically. In this paper, we present a results of a phasing strategy using a non-redundant pupil mask. We show how this method can be extended to measure segment piston differences of more than half a wave by using broadband light.
doi:10.20353/k3t4cp1131559 fatcat:hqkeeptcfngiff2vr5gywsfyie