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h3 { font-size: 3.3rem; color: #999; } /* CATEGORY -- ARCHIVE */ .category h2 { font-size: 18px; } .category article { margin-bottom: auto } .category div.site-inner { margin-bottom: 10%; } .category #genesis-sidebar-primary.sidebar.sidebar-primary.widget-area { margin-top: 160px; } .category-meet-a-desi-member h2 { font-size: 26px; font-weight: 700; padding-top: 20px; border-top: 2px solid #dedede; } .entry-header, .entry-title a { color: #00a0af; text-align: left; padding-bottom: 1%; font-weight: 600; font-size: 2.6rem;} .archive #genesis-sidebar-primary { background-color: #f8f8f8; padding: 0px; margin-top: 15%; } .archive #genesis-sidebar-primary h3.widget-title { font-size: 2rem; font-weight: 500; padding-bottom: 10px; } .archive #genesis-sidebar-primary h4.entry-title { font-size: 3rem; color: #00a0af; margin-bottom: 0; } .archive .sidebar .entry-title a { font-size: 2rem; color: #00a0af; margin-bottom: 0; } /* ARCHIVE PAGES */ .archive-description, .author-box { border-bottom: 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background-color: #f8f8f8; padding: 8%; } #nav_menu-17 h3 { margin-bottom: 0; } /* PAGES */ h1.entry-title { font-size: 4.8rem; margin-bottom: 6%; text-align: left; } div.photo-summary img { margin-bottom: 4%; } /* FULL-WIDTH */ .full-width .content { padding-right: 0px; font-size: 1.8rem; font-family: open-sans, sans-serif; } .full-width h1.entry-title { padding-left: 0px; } /* MISC */ .institute { font-weight: bold; color: #099; } hr { border-bottom: 1px solid #ddd; } /* EXTERNAL LINKS */ a.ext:after, .ext a:after, h3.ext:after { content: ''; display: inline-block; /* float: right; */ margin-left: 10px; width: 12px; height: 12px; background-image: url(/wp-content/uploads/sites/8/2018/06/ext-1.png); background-size: 24px 12px; background-repeat: no-repeat; background-position: -12px 0; } a.ext.white:after, .ext.white a:after, a.ext:hover:after, .ext a:hover:after { background-position:0 0; } .home-middle .ext:after, .entry-title-link.ext:after { content: ''; display: inline-block; width: 12px; height: 12px; background-image: url(images/ext.png); background-size:24px 12px; background-repeat:no-repeat; background-position:-12px 0; margin-left:8px; float:none; } /* ---- Flex Gallery ---- */ .children { display: flex; flex-flow: row wrap; justify-content: space-around; min-height: 200px; } .child { flex: 0 0 auto; list-style-type: none; width: 30%; padding: 25px; border: solid 1px #ddd; font-size: 1.6rem; } .child a { background-color: #fff; display: block; padding: 0; background-repeat: no-repeat; background-size: contain; background-position: center top; color: #333333; text-decoration: none; text-align: center; position: relative; } .child h3 { text-decoration: none; text-align: center; font-size: 2.3rem; font-weight: 600; /* letter-spacing: 3px; */ color: #fff; line-height: 0; margin-bottom: 0; } /* ---- FOOTER ---- */ .social-links img { height: 40px; padding-right: 20px; } a.footer-button { color: white; padding: 16px; text-align: center; text-decoration: none; display: inline-block; font-size: 16px; margin: 4px 30px 30px 0px; cursor: pointer; border-radius: 8px; border: 1px solid #fff; } .site-footer { display: none; } .footer-widgets a { text-decoration: none; display: inline; } footer .footer-social { margin: 36px 0 24px 0; padding: 0; font-size: 30px; text-align: center; } .copyright { font-size: 70%; padding-top: 20px; } .wp-caption-text { margin-top: 8px; }</style></head> <body class="page-template-default page page-id-161 page-child parent-pageid-27 custom-header header-image content-sidebar genesis-breadcrumbs-hidden genesis-footer-widgets-visible" itemscope itemtype="https://schema.org/WebPage"><div class="site-container"><ul class="genesis-skip-link"><li><a href="#genesis-content" class="screen-reader-shortcut"> Skip to main content</a></li><li><a href="#genesis-sidebar-primary" class="screen-reader-shortcut"> Skip to primary sidebar</a></li><li><a href="#genesis-footer-widgets" class="screen-reader-shortcut"> Skip to footer</a></li></ul><header class="site-header" itemscope itemtype="https://schema.org/WPHeader"><div class="wrap"><div class="title-area"><p class="site-title" itemprop="headline"><a href="https://www.desi.lbl.gov/">Dark Energy Spectroscopic Instrument (DESI)</a></p></div><div class="widget-area header-widget-area"><section id="nav_menu-20" class="widget widget_nav_menu"><div class="widget-wrap"><nav class="nav-header" itemscope itemtype="https://schema.org/SiteNavigationElement"><ul id="menu-main-navigation" class="menu genesis-nav-menu js-superfish"><li id="menu-item-59" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-59"><a href="https://www.desi.lbl.gov/science/" itemprop="url"><span itemprop="name">/ science /</span></a> <ul class="sub-menu"> <li id="menu-item-994" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-994"><a href="https://www.desi.lbl.gov/science/" itemprop="url"><span itemprop="name">science overview</span></a></li> <li id="menu-item-77" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-77"><a href="https://www.desi.lbl.gov/cosmology-and-dark-energy/" itemprop="url"><span itemprop="name">cosmology and dark energy</span></a></li> <li id="menu-item-80" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-80"><a href="https://www.desi.lbl.gov/redshifts-and-distance/" itemprop="url"><span itemprop="name">redshifts and distance</span></a></li> <li id="menu-item-79" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-79"><a href="https://www.desi.lbl.gov/mapping-the-universe/" itemprop="url"><span itemprop="name">mapping the universe</span></a></li> <li id="menu-item-81" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-81"><a href="https://www.desi.lbl.gov/the-desi-science-mission/" itemprop="url"><span itemprop="name">the DESI science mission</span></a></li> <li id="menu-item-82" 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menu-item-has-children menu-item-91"><a href="https://www.desi.lbl.gov/bringing-desi-to-life/" itemprop="url"><span itemprop="name">bringing DESI to life</span></a> <ul class="sub-menu"> <li id="menu-item-212" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-212"><a href="https://www.desi.lbl.gov/bringing-desi-to-life/commissioning-instrument/" itemprop="url"><span itemprop="name">commissioning Instrument</span></a></li> <li id="menu-item-213" class="menu-item menu-item-type-post_type menu-item-object-page current-menu-item page_item page-item-161 current_page_item menu-item-213"><a href="https://www.desi.lbl.gov/bringing-desi-to-life/protodesi/" aria-current="page" itemprop="url"><span itemprop="name">protoDESI</span></a></li> </ul> </li> </ul> </li> <li id="menu-item-61" class="collaboration menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-61"><a href="https://www.desi.lbl.gov/collaboration/" itemprop="url"><span 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menu-item-3043"><a href="https://www.desi.lbl.gov/for-scientists/target-selection-and-survey-validation/" itemprop="url"><span itemprop="name">target selection and survey validation</span></a></li> <li id="menu-item-3083" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3083"><a href="https://www.desi.lbl.gov/for-scientists/theory-and-simulations/" itemprop="url"><span itemprop="name">theory and simulations</span></a></li> <li id="menu-item-3084" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3084"><a href="https://www.desi.lbl.gov/for-scientists/other-desi-science/" itemprop="url"><span itemprop="name">other DESI science</span></a></li> <li id="menu-item-1513" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-1513"><a href="https://ui.adsabs.harvard.edu/public-libraries/XCj7bW-vSMaNZVV0C0QyGA" itemprop="url"><span itemprop="name">all DESI papers</span></a></li> <li id="menu-item-393" class="ext menu-item 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src="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2019/12/spanish-1-e1576602273893.png" alt="" width="50" height="50" /></a><a href="https://www.desi.lbl.gov/ca/bringing-desi-to-life-catalan/protodesi-catalan"><img decoding="async" class="alignleft" src="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2021/08/3253480-catalonia-icon-flag_106770-e1629935057530.png" alt="" width="50" height="50" /></a><a href="https://www.desi.lbl.gov/it/bringing-desi-to-life-italian/protodesi-italian"><img loading="lazy" decoding="async" class="alignleft" src="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2021/12/flag_italy-600x600.png" alt="" width="50" height="50" /></a></p> <figure id="attachment_339" aria-describedby="caption-attachment-339" style="width: 1024px" class="wp-caption aligncenter"><a href="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/06/spectrograph.jpeg"><img loading="lazy" decoding="async" class="size-large wp-image-339" src="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/06/spectrograph-1024x692.jpeg" alt="" width="1024" height="692" srcset="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/06/spectrograph-1024x692.jpeg 1024w, https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/06/spectrograph-600x406.jpeg 600w, https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/06/spectrograph-768x519.jpeg 768w, https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/06/spectrograph-300x203.jpeg 300w" sizes="(max-width: 1024px) 100vw, 1024px" /></a><figcaption id="caption-attachment-339" class="wp-caption-text">Spectrograph</figcaption></figure> <p style="text-align: left">The ProtoDESI experiment was designed to answer the question: Can DESI align its optical fibers with the targets using robotic positioners, and keep them aligned for the duration of a DESI exposure?</p> <p style="text-align: left">The answer: Yes. ProtoDESI demonstrated the successful performance of the robotic positioners and alignment system.</p> <p style="text-align: left">ProtoDESI is a subset of DESI subsystems. It was built to operate with a simplified prime focus instrument, a Fiber View Camera (FVC) for positioning feedback, Telescope Control System (TCS), and Instrument Control System (ICS). Rather than measuring the output of a 50-meter fiber cable with DESI’a spectrographs, ProtoDESI confirmed fiber pointing and stability with a fiber photometry camera (FPC) that imaged the ends of the short 3-meter fibers mounted on the prime focus instrument. The success of ProtoDESI relied heavily on the interaction of its hardware and software, and on the careful translation between focal plane coordinates and target locations. ProtoDESI was mounted to the Mayall telescope from August 15 to September 30, 2016.</p> <figure id="attachment_458" aria-describedby="caption-attachment-458" style="width: 783px" class="wp-caption aligncenter"><a href="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/07/success.png"><img loading="lazy" decoding="async" class="size-full wp-image-458" src="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/07/success.png" alt="" width="783" height="587" srcset="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/07/success.png 783w, https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/07/success-600x450.png 600w, https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/07/success-768x576.png 768w" sizes="(max-width: 783px) 100vw, 783px" /></a><figcaption id="caption-attachment-458" class="wp-caption-text">A photo of DESI researchers taken after the first successful alignment of ProtoDESI fibers with targets</figcaption></figure> <figure id="attachment_457" aria-describedby="caption-attachment-457" style="width: 846px" class="wp-caption aligncenter"><a href="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/07/pd_installed.png"><img loading="lazy" decoding="async" class="size-full wp-image-457" src="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/07/pd_installed.png" alt="" width="846" height="742" srcset="https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/07/pd_installed.png 846w, https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/07/pd_installed-600x526.png 600w, https://www.desi.lbl.gov/wp-content/uploads/sites/8/2018/07/pd_installed-768x674.png 768w" sizes="(max-width: 846px) 100vw, 846px" /></a><figcaption id="caption-attachment-457" class="wp-caption-text">ProtoDESI installed in the prime focus of the Mayall Telescope</figcaption></figure> </div></article></main><aside class="sidebar sidebar-primary widget-area" role="complementary" aria-label="Primary Sidebar" itemscope 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