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    Lessons learned from wet washing the 6.5m MMT primary mirror in-situ

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    1070004.pdf
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    Author
    Ortiz, Ricardo
    Williams, Joseph T.
    Goble, William
    Affiliation
    Univ Arizona, MMT Observ
    Issue Date
    2018
    Keywords
    MMT Observatory
    aluminum coatings
    reflectance
    scattering
    CO2 cleaning
    mirror washing
    
    Metadata
    Show full item record
    Publisher
    SPIE-INT SOC OPTICAL ENGINEERING
    Citation
    Ricardo Ortiz, Joseph T. Williams, and William Goble "Lessons learned from wet washing the 6.5m MMT primary mirror in-situ", Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 1070004 (6 July 2018); doi: 10.1117/12.2314348; https://doi.org/10.1117/12.2314348
    Journal
    GROUND-BASED AND AIRBORNE TELESCOPES VII
    Rights
    © 2018 SPIE.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    After gathering spectrophotometer data from the 6.5m primary mirror at the MMT Observatory (MMT) for over ten years, the MMT has developed a soap and water wash procedure that effectively removes contaminates from the surface of the mirror without damaging the bare aluminum coating. While the in-situ soap and water wash requires a small amount of telescope downtime, these washes are still scheduled to take place every six months. The frequency of the washing was selected to keep the mirror performance as close to a fresh coating as possible throughout the year and to extend the recoating interval without allowing the reflectivity degrading more than 3% from a fresh coating. After being in service for almost two years, the spectrophotometer measurements indicate the 2016 primary mirror coating is on-track to maintain the specified reflectance for five years. This paper outlines the soap and water wash procedure developed for the MMT primary mirror and presents spectrophotometer data throughout the life of the 2005 and the 2016 mirror coatings.
    ISSN
    9781510619531
    9781510619548
    DOI
    10.1117/12.2314348
    10.1117/12.2314348.5807160624001
    Version
    Final published version
    Additional Links
    https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10700/2314348/Lessons-learned-from-wet-washing-the-65m-MMT-primary-mirror/10.1117/12.2314348.full
    https://www.spiedigitallibrary.org/conference-presentations/10700/1070004/Lessons-learned-from-wet-washing-the-65m-MMT-primary-mirror/10.1117/12.2314348.5807160624001
    ae974a485f413a2113503eed53cd6c53
    10.1117/12.2314348
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    UA Faculty Publications

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