Optical design of MAAT: an IFU for the GTC OSIRIS spectrograph

Robert Content

doi:10.1117/12.2563127

28 December 2020 Optical design of MAAT: an IFU for the GTC OSIRIS spectrograph

Robert Content

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 114476V (2020) https://doi.org/10.1117/12.2563127
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The Mirror-slicer Array for Astronomical Transients (MAAT; http://maat.iaa.es) is an IFU for the OSIRIS spectrograph on the 10.4-m Gran Telescopio CANARIAS (GTC), spectrograph that has been operational for many years and is being upgraded. The Preliminary Design Review (PDR) phase is in progress. The spectrograph can be used for multi-objects spectroscopy using masks that are in a cartridge. The IFU will be in a box that will take the place of a few masks. It is based on the Advanced Image Slicer concept as for MUSE and KMOS on the VLT and many others. The field under study is 14.2" x 10" with a spaxel size of 0.254" x 0.303". Reflective and transmissive optics are under study due to the limited performances of both reflective and transmissive coatings in the range 360 nm to 1000 nm. The curvature and tilt of the slit creates additional challenges. Preliminary calculations give a resolution 1.6 times larger than with a standard slit of 0.6" because of the smaller size of the slices. This however assumes typical aberrations for the spectrograph. We intend to measure the wavefront of the aberrations by using 2 out-of-focus masks with pinholes along the slit, and then correct some of these aberrations with the IFU. A downgraded version of the IFU with a smaller field is also under study in case we need to simplify the project.

Citation Download Citation

Robert Content "Optical design of MAAT: an IFU for the GTC OSIRIS spectrograph", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114476V (28 December 2020); https://doi.org/10.1117/12.2563127

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available