Final A&T stages of the Gemini Planet Finder

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Proceedings titleAdaptive Optics for Extremely Large Telescopes (Third AO4ELT Conference)
ConferenceThird AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes, May 26-31, 2013, Florence Italy
Physical description10 p.
AbstractThe Gemini Planet Imager (GPI) is currently in its final Acceptance & Testing stages. GPI is an XAO system based on a tweeter & woofer architecture (43 & 9 actuators respectively across the pupil), with the tweeter being a Boston Michromachines 64² MEMS device. The XAO AO system is tightly integrated with a Lyot apodizing coronagraph. Acceptance testing started in February 2013 at the University of California, Santa Cruz. A conclusive acceptance review was held in July 2013 and the instrument was found ready for shipment to the Gemini South telescope on Cerro Pachon, Chile. Commissioning at the telescope will take place by the end of 2013, matching the summer window of the southern hemisphere. According to current estimates the 3 year planet finding campaign (890 allocated hours) might discover, image, and spectroscopically analyze 20 to 40 new exo-planets. Final acceptance testing of the integrated instrument can always bring up surprises when using cold chamber and flexure rig installations. The latest developments are reported. Also, we will give an overview of GPI's lab performance, the interplay between subsystems such as the calibration unit (CAL) with the AO bench. We report on-going optimizations on the AO controller loop to filter vibrations and last but not least achieved contrast performance applying speckle nulling. Furthermore, we will give an outlook of possible but challenging future upgrades as the implementation of a predictive controller or exchanging the conventional 48x48 SH WFS with a pyramid. With the ELT era arising, GPI will proof as a versatile and path-finding testbed for AO technologies on the next generation of ground-based telescopes.
Publication date
PublisherCentre pour la Communication Scientifique Directe
AffiliationNational Research Council Canada; National Science Infrastructure
Peer reviewedYes
NPARC number23001779
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Record identifierb31cf478-8761-4711-8d1b-c2d31169a74f
Record created2017-04-04
Record modified2017-04-04
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