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New wavefront-sensing guiders for SOAR
Author(s): Andrei Tokovinin; Nicole David; José Piracés; Rolando Cantarutti
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Paper Abstract

The 4.1-m SOAR telescope needs fast tip-tilt guiding and active correction of focus and astigmatism to reach good image quality allowed by the excellent site seeing. A concept of the new guider with a 2×2 wavefront sensor is presented. It uses the X-Y positioning mechanism of the current guider, while the pick-off arm, camera, and detector are replaced by the new hardware. The pick-off arm has 2 positive lenses to collimate the beam, with an internal focus adjustment to compensate for focus offset in the science instrument and for the field curvature. The 4 spots are formed by a mirror with slightly tilted segments, located near the camera. The detector is an EM CCD; guiding on stars as faint as V=17 mag is possible using the correlation algorithm for centroiding; aberrations are measured on the averaged images. Results of the on-sky tests of the new guider prototype are presented.

Paper Details

Date Published: 6 July 2018
PDF: 12 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107022F (6 July 2018); doi: 10.1117/12.2312082
Show Author Affiliations
Andrei Tokovinin, Cerro Tololo Inter-American Observatory (Chile)
Nicole David, Cerro Tololo Inter-American Observatory (Chile)
José Piracés, Cerro Tololo Inter-American Observatory (Chile)
Rolando Cantarutti, Cerro Tololo Inter-American Observatory (Chile)

Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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